diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..723ef36f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.idea
\ No newline at end of file
diff --git a/discodeit/.gradle/9.0.0/checksums/checksums.lock b/discodeit/.gradle/9.0.0/checksums/checksums.lock
new file mode 100644
index 00000000..55ca3088
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diff --git a/discodeit/.gradle/9.0.0/executionHistory/executionHistory.bin b/discodeit/.gradle/9.0.0/executionHistory/executionHistory.bin
new file mode 100644
index 00000000..182418c3
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diff --git a/discodeit/.gradle/9.0.0/executionHistory/executionHistory.lock b/discodeit/.gradle/9.0.0/executionHistory/executionHistory.lock
new file mode 100644
index 00000000..c977e089
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diff --git a/discodeit/.gradle/9.0.0/fileChanges/last-build.bin b/discodeit/.gradle/9.0.0/fileChanges/last-build.bin
new file mode 100644
index 00000000..f76dd238
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diff --git a/discodeit/.gradle/9.0.0/fileHashes/fileHashes.bin b/discodeit/.gradle/9.0.0/fileHashes/fileHashes.bin
new file mode 100644
index 00000000..f2dd4374
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diff --git a/discodeit/.gradle/9.0.0/fileHashes/fileHashes.lock b/discodeit/.gradle/9.0.0/fileHashes/fileHashes.lock
new file mode 100644
index 00000000..a64433b9
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diff --git a/discodeit/.gradle/9.0.0/fileHashes/resourceHashesCache.bin b/discodeit/.gradle/9.0.0/fileHashes/resourceHashesCache.bin
new file mode 100644
index 00000000..39a6c411
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diff --git a/discodeit/.gradle/9.0.0/gc.properties b/discodeit/.gradle/9.0.0/gc.properties
new file mode 100644
index 00000000..e69de29b
diff --git a/discodeit/.gradle/buildOutputCleanup/buildOutputCleanup.lock b/discodeit/.gradle/buildOutputCleanup/buildOutputCleanup.lock
new file mode 100644
index 00000000..1d863b31
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diff --git a/discodeit/.gradle/buildOutputCleanup/cache.properties b/discodeit/.gradle/buildOutputCleanup/cache.properties
new file mode 100644
index 00000000..a2335bee
--- /dev/null
+++ b/discodeit/.gradle/buildOutputCleanup/cache.properties
@@ -0,0 +1,2 @@
+#Thu Feb 05 11:51:55 KST 2026
+gradle.version=9.0.0
diff --git a/discodeit/.gradle/buildOutputCleanup/outputFiles.bin b/discodeit/.gradle/buildOutputCleanup/outputFiles.bin
new file mode 100644
index 00000000..e4da7f8a
Binary files /dev/null and b/discodeit/.gradle/buildOutputCleanup/outputFiles.bin differ
diff --git a/discodeit/.gradle/vcs-1/gc.properties b/discodeit/.gradle/vcs-1/gc.properties
new file mode 100644
index 00000000..e69de29b
diff --git a/discodeit/build.gradle b/discodeit/build.gradle
new file mode 100644
index 00000000..602a4a8b
--- /dev/null
+++ b/discodeit/build.gradle
@@ -0,0 +1,20 @@
+plugins {
+    id 'java'
+}
+
+group = 'com.sprint.mission'
+version = '1.0-SNAPSHOT'
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation platform('org.junit:junit-bom:5.10.0')
+    testImplementation 'org.junit.jupiter:junit-jupiter'
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+}
+
+test {
+    useJUnitPlatform()
+}
\ No newline at end of file
diff --git a/discodeit/build/classes/java/main/com/sprint/mission/discodeit/JavaApplication.class b/discodeit/build/classes/java/main/com/sprint/mission/discodeit/JavaApplication.class
new file mode 100644
index 00000000..462c43c5
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diff --git a/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/entity/Channel.class b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/entity/Channel.class
new file mode 100644
index 00000000..2645176f
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diff --git a/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/entity/ChannelType.class b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/entity/ChannelType.class
new file mode 100644
index 00000000..84b14174
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diff --git a/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/entity/Message.class b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/entity/Message.class
new file mode 100644
index 00000000..ec4a897b
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diff --git a/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/entity/User.class b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/entity/User.class
new file mode 100644
index 00000000..6948c191
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diff --git a/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/repository/ChannelRepository.class b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/repository/ChannelRepository.class
new file mode 100644
index 00000000..c8ff61a4
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diff --git a/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/repository/MessageRepository.class b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/repository/MessageRepository.class
new file mode 100644
index 00000000..53597b6c
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diff --git a/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/repository/UserRepository.class b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/repository/UserRepository.class
new file mode 100644
index 00000000..83f613a4
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diff --git a/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/repository/file/FileUserRepository.class b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/repository/file/FileUserRepository.class
new file mode 100644
index 00000000..64454be8
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diff --git a/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/repository/file/FileaChannelRepository.class b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/repository/file/FileaChannelRepository.class
new file mode 100644
index 00000000..d8f939ca
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diff --git a/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/repository/file/FileaMessageRepository.class b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/repository/file/FileaMessageRepository.class
new file mode 100644
index 00000000..d9936dbd
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diff --git a/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/repository/jcf/JCFChannelRepository.class b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/repository/jcf/JCFChannelRepository.class
new file mode 100644
index 00000000..9991801c
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diff --git a/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/repository/jcf/JCFMessageRepository.class b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/repository/jcf/JCFMessageRepository.class
new file mode 100644
index 00000000..57c1d869
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diff --git a/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/repository/jcf/JCFUserRepository.class b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/repository/jcf/JCFUserRepository.class
new file mode 100644
index 00000000..3cab396e
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diff --git a/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/service/ChannelService.class b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/service/ChannelService.class
new file mode 100644
index 00000000..21f618f5
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diff --git a/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/service/MessageService.class b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/service/MessageService.class
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index 00000000..7e4c3fe3
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diff --git a/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/service/UserService.class b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/service/UserService.class
new file mode 100644
index 00000000..b652739a
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diff --git a/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/service/file/FileChannelService.class b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/service/file/FileChannelService.class
new file mode 100644
index 00000000..aca8b3cf
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diff --git a/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/service/file/FileMessageService.class b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/service/file/FileMessageService.class
new file mode 100644
index 00000000..4ef07d7e
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diff --git a/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/service/file/FileUserService.class b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/service/file/FileUserService.class
new file mode 100644
index 00000000..375a55fa
Binary files /dev/null and b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/service/file/FileUserService.class differ
diff --git a/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/service/jcf/JCFChannelService.class b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/service/jcf/JCFChannelService.class
new file mode 100644
index 00000000..e7b1125d
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diff --git a/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/service/jcf/JCFMessageService.class b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/service/jcf/JCFMessageService.class
new file mode 100644
index 00000000..2268c0c2
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diff --git a/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/service/jcf/JCFUserService.class b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/service/jcf/JCFUserService.class
new file mode 100644
index 00000000..0d1802a3
Binary files /dev/null and b/discodeit/build/classes/java/main/main/java/com/sprint/mission/discodeit/service/jcf/JCFUserService.class differ
diff --git a/discodeit/build/tmp/compileJava/compileTransaction/stash-dir/JavaApplication.class.uniqueId0 b/discodeit/build/tmp/compileJava/compileTransaction/stash-dir/JavaApplication.class.uniqueId0
new file mode 100644
index 00000000..4b779f36
Binary files /dev/null and b/discodeit/build/tmp/compileJava/compileTransaction/stash-dir/JavaApplication.class.uniqueId0 differ
diff --git a/discodeit/build/tmp/compileJava/previous-compilation-data.bin b/discodeit/build/tmp/compileJava/previous-compilation-data.bin
new file mode 100644
index 00000000..28848449
Binary files /dev/null and b/discodeit/build/tmp/compileJava/previous-compilation-data.bin differ
diff --git a/discodeit/gradle/wrapper/gradle-wrapper.jar b/discodeit/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 00000000..8bdaf60c
Binary files /dev/null and b/discodeit/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/discodeit/gradle/wrapper/gradle-wrapper.properties b/discodeit/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 00000000..2a84e188
--- /dev/null
+++ b/discodeit/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.0.0-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/discodeit/gradlew b/discodeit/gradlew
new file mode 100644
index 00000000..ef07e016
--- /dev/null
+++ b/discodeit/gradlew
@@ -0,0 +1,251 @@
+#!/bin/sh
+
+#
+# Copyright © 2015 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH="\\\"\\\""
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/discodeit/gradlew.bat b/discodeit/gradlew.bat
new file mode 100644
index 00000000..db3a6ac2
--- /dev/null
+++ b/discodeit/gradlew.bat
@@ -0,0 +1,94 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/discodeit/settings.gradle b/discodeit/settings.gradle
new file mode 100644
index 00000000..345c89f6
--- /dev/null
+++ b/discodeit/settings.gradle
@@ -0,0 +1 @@
+rootProject.name = 'discodeit'
\ No newline at end of file
diff --git a/discodeit/src/main/java/com/sprint/mission/discodeit/JavaApplication.java b/discodeit/src/main/java/com/sprint/mission/discodeit/JavaApplication.java
new file mode 100644
index 00000000..8cac71ef
--- /dev/null
+++ b/discodeit/src/main/java/com/sprint/mission/discodeit/JavaApplication.java
@@ -0,0 +1,53 @@
+package com.sprint.mission.discodeit;
+
+import main.java.com.sprint.mission.discodeit.entity.Channel;
+import main.java.com.sprint.mission.discodeit.entity.ChannelType;
+import main.java.com.sprint.mission.discodeit.entity.Message;
+import main.java.com.sprint.mission.discodeit.entity.User;
+import main.java.com.sprint.mission.discodeit.repository.UserRepository;
+import main.java.com.sprint.mission.discodeit.repository.file.FileUserRepository;
+import main.java.com.sprint.mission.discodeit.service.ChannelService;
+import main.java.com.sprint.mission.discodeit.service.MessageService;
+import main.java.com.sprint.mission.discodeit.service.UserService;
+import main.java.com.sprint.mission.discodeit.service.file.FileUserService;
+
+public class JavaApplication {
+
+    static User setupUser(UserService userService) {
+        User user = userService.create("woody", "woody@codeit.com", "woody1234");
+        return user;
+    }
+
+    static Channel setupChannel(ChannelService channelService) {
+        Channel channel = channelService.create(ChannelType.PUBLIC, "공지", "공지 채널입니다.");
+        return channel;
+    }
+
+    static void messageCreateTest(MessageService messageService, Channel channel, User author) {
+        Message message = messageService.create("안녕하세요.", author.getId(), channel.getId());
+        System.out.println("메시지 생성 완료! ID: " + message.getId());
+        System.out.println("내용: " + message.getMsgText());
+    }
+
+    public static void main(String[] args) {
+        UserRepository userRepository = new FileUserRepository();
+
+        UserService userService = new FileUserService();
+
+        ChannelService channelService = new main.java.com.sprint.mission.discodeit.service.jcf.JCFChannelService();
+        MessageService messageService = new main.java.com.sprint.mission.discodeit.service.jcf.JCFMessageService();
+
+        System.out.println("=== 테스트 환경 세팅 완료 ===");
+
+        User user = setupUser(userService);
+        System.out.println("유저 셋업 완료: " + user.getDisplayName());
+
+        Channel channel = setupChannel(channelService);
+        System.out.println("채널 셋업 완료: " + channel.getChannelName());
+
+        System.out.println("--- 메시지 생성 테스트 시작 ---");
+        messageCreateTest(messageService, channel, user);
+
+        System.out.println("=== 모든 테스트 종료 ===");
+    }
+}
\ No newline at end of file
diff --git a/discodeit/src/main/java/com/sprint/mission/discodeit/entity/Channel.java b/discodeit/src/main/java/com/sprint/mission/discodeit/entity/Channel.java
new file mode 100644
index 00000000..8bc5d60d
--- /dev/null
+++ b/discodeit/src/main/java/com/sprint/mission/discodeit/entity/Channel.java
@@ -0,0 +1,57 @@
+package main.java.com.sprint.mission.discodeit.entity;
+
+import java.io.Serializable;
+import java.text.SimpleDateFormat;
+import java.util.UUID;
+
+public class Channel implements Serializable {
+    private final UUID id;
+    private String channelName;
+    private String description;
+    private final Long createdAt;
+    private Long updatedAt;
+    private SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+    Long now = System.currentTimeMillis();
+
+    public Channel (String channelName, String description) {
+        this.id = UUID.randomUUID();
+        this.channelName = channelName;
+        this.description = description;
+        this.createdAt = now;
+        this.updatedAt = now;
+    }
+
+    public UUID getId() {
+        return id;
+    }
+
+    public String getChannelName() {
+        return channelName;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public Long getCreatedAt() {
+        return createdAt;
+    }
+
+    public Long getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void update(UUID id, String channelName, String description) {
+        this.channelName = channelName;
+        this.description = description;
+        this.updatedAt = now;
+    }
+
+    @Override
+    public String toString() {
+        return "Channel{" +
+                ", channelName='" + channelName + '\'' +
+                ", description='" + description + '\'' +
+                '}';
+    }
+}
diff --git a/discodeit/src/main/java/com/sprint/mission/discodeit/entity/ChannelType.java b/discodeit/src/main/java/com/sprint/mission/discodeit/entity/ChannelType.java
new file mode 100644
index 00000000..5692cc59
--- /dev/null
+++ b/discodeit/src/main/java/com/sprint/mission/discodeit/entity/ChannelType.java
@@ -0,0 +1,6 @@
+package main.java.com.sprint.mission.discodeit.entity;
+
+public enum ChannelType {
+    PUBLIC,
+    PRIVATE,
+}
diff --git a/discodeit/src/main/java/com/sprint/mission/discodeit/entity/Message.java b/discodeit/src/main/java/com/sprint/mission/discodeit/entity/Message.java
new file mode 100644
index 00000000..620a5a25
--- /dev/null
+++ b/discodeit/src/main/java/com/sprint/mission/discodeit/entity/Message.java
@@ -0,0 +1,67 @@
+package main.java.com.sprint.mission.discodeit.entity;
+
+import java.io.Serializable;
+import java.text.SimpleDateFormat;
+import java.util.UUID;
+
+public class Message implements Serializable {
+    private final UUID id;
+    private final UUID senderId;
+    private final UUID channelId;
+    private final Long createdAt;
+    private Long updatedAt;
+    private String msgText;
+    private String displayName;
+    private SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+
+    public Message(String msgText, UUID senderId, UUID channelId) {
+        this.id = UUID.randomUUID();
+        this.senderId = senderId;
+        this.channelId = channelId;
+        Long now = System.currentTimeMillis();
+        this.createdAt = now;
+        this.updatedAt = now;
+        this.msgText = msgText;
+    }
+
+    public UUID getId() {
+        return id;
+    }
+
+    public UUID getSenderId() {
+        return senderId;
+    }
+
+    public UUID getChannelId() {
+        return channelId;
+    }
+
+    public Long getCreatedAt() {
+        return createdAt;
+    }
+
+    public Long getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public String getMsgText() {
+        return msgText;
+    }
+
+    public String getDisplayName() {
+        return displayName;
+    }
+
+    public void update(String updateMsg) {
+        this.msgText = updateMsg;
+        this.updatedAt = System.currentTimeMillis();
+    }
+
+    @Override
+    public String toString() {
+        return "Message{" +
+                ", msgText='" + msgText + '\'' +
+                ", displayName='" + displayName + '\'' +
+                '}';
+    }
+}
\ No newline at end of file
diff --git a/discodeit/src/main/java/com/sprint/mission/discodeit/entity/User.java b/discodeit/src/main/java/com/sprint/mission/discodeit/entity/User.java
new file mode 100644
index 00000000..4423c54b
--- /dev/null
+++ b/discodeit/src/main/java/com/sprint/mission/discodeit/entity/User.java
@@ -0,0 +1,76 @@
+package main.java.com.sprint.mission.discodeit.entity;
+
+import java.io.Serializable;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.UUID;
+
+public class User implements Serializable {
+    private final UUID id;
+    private final Long createdAt;
+    private Long updatedAt;
+    private String displayName;
+    private String email;
+    private String phoneNumber;
+
+    public User(String displayName, String email, String phoneNumber) {
+        this.id = UUID.randomUUID();
+        long now = System.currentTimeMillis();
+        this.createdAt = now;
+        this.updatedAt = now;
+        this.displayName = displayName;
+        this.email = email;
+        this.phoneNumber = phoneNumber;
+    }
+
+    public UUID getId() {
+        return id;
+    }
+
+    public long getCreatedAt() {
+        return createdAt;
+    }
+
+    public long getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public String getDisplayName() {
+        return displayName;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public String getPhoneNumber() {
+        return phoneNumber;
+    }
+
+    public void update(String name, String email, String phoneNumber) {
+        if (name != null) {
+            this.displayName = name;
+        }
+        if (email != null) {
+            this.email = email;
+        }
+        if (phoneNumber != null) {
+            this.phoneNumber = phoneNumber;
+        }
+        this.updatedAt = System.currentTimeMillis();
+    }
+
+    @Override
+    public String toString() {
+        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+
+        return "User{" +
+                "id=" + id +
+                ", createdAt=" + sdf.format(new Date(createdAt)) +
+                ", updatedAt=" + sdf.format(new Date(updatedAt)) +
+                ", displayName='" + displayName + '\'' +
+                ", email='" + email + '\'' +
+                ", phoneNumber='" + phoneNumber + '\'' +
+                '}';
+    }
+}
\ No newline at end of file
diff --git a/discodeit/src/main/java/com/sprint/mission/discodeit/repository/ChannelRepository.java b/discodeit/src/main/java/com/sprint/mission/discodeit/repository/ChannelRepository.java
new file mode 100644
index 00000000..fb8498f6
--- /dev/null
+++ b/discodeit/src/main/java/com/sprint/mission/discodeit/repository/ChannelRepository.java
@@ -0,0 +1,15 @@
+package main.java.com.sprint.mission.discodeit.repository;
+
+import main.java.com.sprint.mission.discodeit.entity.Channel;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+public interface ChannelRepository {
+    Channel save(Channel channel);
+    Optional<Channel> findId(UUID channelId);
+    List<Channel> findAll();
+    void deleteById(UUID id);
+
+}
diff --git a/discodeit/src/main/java/com/sprint/mission/discodeit/repository/MessageRepository.java b/discodeit/src/main/java/com/sprint/mission/discodeit/repository/MessageRepository.java
new file mode 100644
index 00000000..3c9f79bf
--- /dev/null
+++ b/discodeit/src/main/java/com/sprint/mission/discodeit/repository/MessageRepository.java
@@ -0,0 +1,14 @@
+package main.java.com.sprint.mission.discodeit.repository;
+
+import main.java.com.sprint.mission.discodeit.entity.Message;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+public interface MessageRepository {
+    Message save(Message message);
+    Optional<Message> findId(UUID content);
+    List<Message> findAll();
+    void deleteById(UUID id);
+}
diff --git a/discodeit/src/main/java/com/sprint/mission/discodeit/repository/UserRepository.java b/discodeit/src/main/java/com/sprint/mission/discodeit/repository/UserRepository.java
new file mode 100644
index 00000000..b8183c94
--- /dev/null
+++ b/discodeit/src/main/java/com/sprint/mission/discodeit/repository/UserRepository.java
@@ -0,0 +1,15 @@
+package main.java.com.sprint.mission.discodeit.repository;
+
+import main.java.com.sprint.mission.discodeit.entity.User;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+public interface UserRepository {
+    User save(User user);
+    Optional<User> findId(UUID userId);
+    List<User> findAll();
+    void deleteById(UUID id);
+
+}
diff --git a/discodeit/src/main/java/com/sprint/mission/discodeit/repository/file/FileUserRepository.java b/discodeit/src/main/java/com/sprint/mission/discodeit/repository/file/FileUserRepository.java
new file mode 100644
index 00000000..ff66c939
--- /dev/null
+++ b/discodeit/src/main/java/com/sprint/mission/discodeit/repository/file/FileUserRepository.java
@@ -0,0 +1,99 @@
+package main.java.com.sprint.mission.discodeit.repository.file;
+
+import main.java.com.sprint.mission.discodeit.entity.User;
+import main.java.com.sprint.mission.discodeit.repository.UserRepository;
+
+import java.io.*;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.List;
+import java.util.NoSuchElementException;
+import java.util.Optional;
+import java.util.UUID;
+
+public class FileUserRepository implements UserRepository {
+    private final Path DIRECTORY;
+    private final String EXTENSION = ".ser";
+
+    public FileUserRepository() {
+        this.DIRECTORY = Paths.get(System.getProperty("user.dir"), "file-data-map", User.class.getSimpleName());
+        if (Files.notExists(DIRECTORY)) {
+            try {
+                Files.createDirectories(DIRECTORY);
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
+
+    private Path resolvePath(UUID id) {
+        return DIRECTORY.resolve(id + EXTENSION);
+    }
+
+    @Override
+    public User save(User user) {
+        Path path = resolvePath(user.getId());
+        try (
+                FileOutputStream fos = new FileOutputStream(path.toFile());
+                ObjectOutputStream oos = new ObjectOutputStream(fos)
+        ) {
+            oos.writeObject(user);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+        return user;
+    }
+
+    @Override
+    public Optional<User> findId(UUID userId) {
+        User userNullable = null;
+        Path path = resolvePath(userId);
+        if (Files.exists(path)) {
+            try (
+                    FileInputStream fis = new FileInputStream(path.toFile());
+                    ObjectInputStream ois = new ObjectInputStream(fis)
+            ) {
+                userNullable = (User) ois.readObject();
+            } catch (IOException | ClassNotFoundException e) {
+                throw new RuntimeException(e);
+            }
+        }
+
+        return Optional.ofNullable(userNullable);
+    }
+
+    @Override
+    public List<User> findAll() {
+        try {
+            return Files.list(DIRECTORY)
+                    .filter(path -> path.toString().endsWith(EXTENSION))
+                    .map(path -> {
+                        try (
+                                FileInputStream fis = new FileInputStream(path.toFile());
+                                ObjectInputStream ois = new ObjectInputStream(fis)
+                        ) {
+                            return (User) ois.readObject();
+                        } catch (IOException | ClassNotFoundException e) {
+                            throw new RuntimeException(e);
+                        }
+                    })
+                    .toList();
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    public void deleteById(UUID userId) {
+        Path path = resolvePath(userId);
+        if (Files.notExists(path)) {
+            throw new NoSuchElementException("User with id " + userId + " not found");
+        }
+        try {
+            Files.delete(path);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}
\ No newline at end of file
diff --git a/discodeit/src/main/java/com/sprint/mission/discodeit/repository/file/FileaChannelRepository.java b/discodeit/src/main/java/com/sprint/mission/discodeit/repository/file/FileaChannelRepository.java
new file mode 100644
index 00000000..42a951ac
--- /dev/null
+++ b/discodeit/src/main/java/com/sprint/mission/discodeit/repository/file/FileaChannelRepository.java
@@ -0,0 +1,4 @@
+package main.java.com.sprint.mission.discodeit.repository.file;
+
+public class FileaChannelRepository {
+}
diff --git a/discodeit/src/main/java/com/sprint/mission/discodeit/repository/file/FileaMessageRepository.java b/discodeit/src/main/java/com/sprint/mission/discodeit/repository/file/FileaMessageRepository.java
new file mode 100644
index 00000000..c68b0d93
--- /dev/null
+++ b/discodeit/src/main/java/com/sprint/mission/discodeit/repository/file/FileaMessageRepository.java
@@ -0,0 +1,4 @@
+package main.java.com.sprint.mission.discodeit.repository.file;
+
+public class FileaMessageRepository {
+}
diff --git a/discodeit/src/main/java/com/sprint/mission/discodeit/repository/jcf/JCFChannelRepository.java b/discodeit/src/main/java/com/sprint/mission/discodeit/repository/jcf/JCFChannelRepository.java
new file mode 100644
index 00000000..b4794d4e
--- /dev/null
+++ b/discodeit/src/main/java/com/sprint/mission/discodeit/repository/jcf/JCFChannelRepository.java
@@ -0,0 +1,4 @@
+package main.java.com.sprint.mission.discodeit.repository.jcf;
+
+public class JCFChannelRepository {
+}
diff --git a/discodeit/src/main/java/com/sprint/mission/discodeit/repository/jcf/JCFMessageRepository.java b/discodeit/src/main/java/com/sprint/mission/discodeit/repository/jcf/JCFMessageRepository.java
new file mode 100644
index 00000000..e139934a
--- /dev/null
+++ b/discodeit/src/main/java/com/sprint/mission/discodeit/repository/jcf/JCFMessageRepository.java
@@ -0,0 +1,4 @@
+package main.java.com.sprint.mission.discodeit.repository.jcf;
+
+public class JCFMessageRepository {
+}
diff --git a/discodeit/src/main/java/com/sprint/mission/discodeit/repository/jcf/JCFUserRepository.java b/discodeit/src/main/java/com/sprint/mission/discodeit/repository/jcf/JCFUserRepository.java
new file mode 100644
index 00000000..5c7889c0
--- /dev/null
+++ b/discodeit/src/main/java/com/sprint/mission/discodeit/repository/jcf/JCFUserRepository.java
@@ -0,0 +1,32 @@
+package main.java.com.sprint.mission.discodeit.repository.jcf;
+
+import main.java.com.sprint.mission.discodeit.entity.User;
+import main.java.com.sprint.mission.discodeit.repository.UserRepository;
+
+import java.util.*;
+
+public class JCFUserRepository implements UserRepository {
+    private final Map<UUID, User> userMap = new HashMap<>();
+
+    @Override
+    public User save(User user) {
+        userMap.put(user.getId(), user);
+        return user;
+    }
+
+    @Override
+    public Optional<User> findId(UUID userId) {
+        User user = userMap.get(userId);
+        return Optional.ofNullable(user);
+    }
+
+    @Override
+    public List<User> findAll() {
+        return new ArrayList<>(userMap.values());
+    }
+
+    @Override
+    public void deleteById(UUID id) {
+        userMap.remove(id);
+    }
+}
\ No newline at end of file
diff --git a/discodeit/src/main/java/com/sprint/mission/discodeit/service/ChannelService.java b/discodeit/src/main/java/com/sprint/mission/discodeit/service/ChannelService.java
new file mode 100644
index 00000000..028857a6
--- /dev/null
+++ b/discodeit/src/main/java/com/sprint/mission/discodeit/service/ChannelService.java
@@ -0,0 +1,17 @@
+package main.java.com.sprint.mission.discodeit.service;
+
+import main.java.com.sprint.mission.discodeit.entity.Channel;
+import main.java.com.sprint.mission.discodeit.entity.ChannelType;
+
+import java.util.List;
+import java.util.UUID;
+
+public interface ChannelService {
+
+    Channel create(ChannelType type, String channelName, String description);
+    Channel findId(UUID id);
+    List<Channel> findAll();
+    Channel update(UUID id, String channelName, String description);
+    void delete(UUID uuid);
+
+}
diff --git a/discodeit/src/main/java/com/sprint/mission/discodeit/service/MessageService.java b/discodeit/src/main/java/com/sprint/mission/discodeit/service/MessageService.java
new file mode 100644
index 00000000..77616b06
--- /dev/null
+++ b/discodeit/src/main/java/com/sprint/mission/discodeit/service/MessageService.java
@@ -0,0 +1,20 @@
+package main.java.com.sprint.mission.discodeit.service;
+
+import main.java.com.sprint.mission.discodeit.entity.Message;
+
+import java.util.List;
+import java.util.UUID;
+
+public interface MessageService {
+
+    Message create(String msgText, UUID senderId, UUID channelId);
+
+    Message findId(UUID id);
+
+    List<Message> findAll();
+
+    Message update(UUID id, String msgText);
+
+    void delete(UUID id);
+
+}
\ No newline at end of file
diff --git a/discodeit/src/main/java/com/sprint/mission/discodeit/service/UserService.java b/discodeit/src/main/java/com/sprint/mission/discodeit/service/UserService.java
new file mode 100644
index 00000000..1da6663f
--- /dev/null
+++ b/discodeit/src/main/java/com/sprint/mission/discodeit/service/UserService.java
@@ -0,0 +1,23 @@
+package main.java.com.sprint.mission.discodeit.service;
+
+import main.java.com.sprint.mission.discodeit.entity.User;
+
+import java.util.List;
+import java.util.UUID;
+
+public interface UserService { //인터페이스란 리모컨 전원 버튼의 작동원리는 알 필요없고, "전원 버튼을 누르면 화면이 켜진다"까지만 구현하는 것. 일단 이러한 기능이 필요하다 를 약속하기 위해. 그래서 "생성"은 무엇이고, "수정은"무엇이고,, 를 정의하고 있음
+    //생성
+    User create(String name, String email, String phoneNumber);
+    //수정
+    User update(UUID id, String name, String email, String phoneNumber); //수정할 때 id를 수정한다는 것이 아니고 일단 고유번호 id가 필요하니까
+    //삭제
+    void delete(UUID id); //사용자의 모든 정보(id, email, createdAt 등등 모든 정보를 지워야하는데 id만 지우길래 의아해함. 근데 여기는 interface니까 일단 모든 정보를 가리키는 고유한 id값만 받아와서 다른 클래스에서 delete메소드의 로직을 만들면 됨.
+    //예시) 방법 A (id만 사용): 사서에게 "도서 번호 101번 책 지워주세요"라고 말합니다.
+    //방법 B (모든 정보 사용): 사서에게 "제목은 '자바의 정석'이고, 저자는 '남궁성'이고, 페이지는 500쪽이고, 2024년에 출판된 그 책 지워주세요"라고 말합니다.
+    //다건조회
+    List<User> findAll();
+    //단건 조회
+    User findId(UUID id); //특정 id만 찾음
+
+
+}
\ No newline at end of file
diff --git a/discodeit/src/main/java/com/sprint/mission/discodeit/service/file/FileChannelService.java b/discodeit/src/main/java/com/sprint/mission/discodeit/service/file/FileChannelService.java
new file mode 100644
index 00000000..3b56457e
--- /dev/null
+++ b/discodeit/src/main/java/com/sprint/mission/discodeit/service/file/FileChannelService.java
@@ -0,0 +1,4 @@
+package main.java.com.sprint.mission.discodeit.service.file;
+
+public class FileChannelService {
+}
diff --git a/discodeit/src/main/java/com/sprint/mission/discodeit/service/file/FileMessageService.java b/discodeit/src/main/java/com/sprint/mission/discodeit/service/file/FileMessageService.java
new file mode 100644
index 00000000..787ae49c
--- /dev/null
+++ b/discodeit/src/main/java/com/sprint/mission/discodeit/service/file/FileMessageService.java
@@ -0,0 +1,4 @@
+package main.java.com.sprint.mission.discodeit.service.file;
+
+public class FileMessageService {
+}
diff --git a/discodeit/src/main/java/com/sprint/mission/discodeit/service/file/FileUserService.java b/discodeit/src/main/java/com/sprint/mission/discodeit/service/file/FileUserService.java
new file mode 100644
index 00000000..fbfa5eea
--- /dev/null
+++ b/discodeit/src/main/java/com/sprint/mission/discodeit/service/file/FileUserService.java
@@ -0,0 +1,55 @@
+package main.java.com.sprint.mission.discodeit.service.file;
+
+
+//import com.sprint.mission.discodeit.entity.User;
+//import com.sprint.mission.discodeit.service.UserService;
+
+import main.java.com.sprint.mission.discodeit.entity.User;
+import main.java.com.sprint.mission.discodeit.repository.file.FileUserRepository;
+import main.java.com.sprint.mission.discodeit.service.UserService;
+
+import java.util.List;
+import java.util.NoSuchElementException;
+import java.util.UUID;
+
+public class FileUserService implements UserService {
+    private final FileUserRepository userRepository;
+
+    public FileUserService() {
+        this.userRepository = new FileUserRepository();
+    }
+
+    @Override
+    public User create(String name, String email, String phoneNumber) {
+        User user = new User(name, email, phoneNumber);
+
+        return userRepository.save(user);
+    }
+
+    @Override
+    public User findId(UUID Id) {
+        return userRepository.findId(Id)
+                .orElseThrow(() -> new NoSuchElementException("없는 유저입니다"));
+    }
+
+    @Override
+    public List<User> findAll() {
+        return userRepository.findAll();
+    }
+
+
+
+    @Override
+    public User update(UUID Id, String name, String email, String phoneNumber) {
+        User user = findId(Id);
+        user.update(name, email, phoneNumber);
+
+        return userRepository.save(user);
+    }
+
+    @Override
+    public void delete(UUID Id) {
+        findId(Id);
+        userRepository.deleteById(Id);
+    }
+}
diff --git a/discodeit/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFChannelService.java b/discodeit/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFChannelService.java
new file mode 100644
index 00000000..d6dc744e
--- /dev/null
+++ b/discodeit/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFChannelService.java
@@ -0,0 +1,53 @@
+package main.java.com.sprint.mission.discodeit.service.jcf;
+
+import main.java.com.sprint.mission.discodeit.entity.Channel;
+import main.java.com.sprint.mission.discodeit.entity.ChannelType;
+import main.java.com.sprint.mission.discodeit.service.ChannelService;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+
+public class JCFChannelService implements ChannelService {
+    public List<Channel> data = new ArrayList<>();
+
+
+    @Override
+    public Channel create(ChannelType type, String channelName, String description) {
+        Channel channel = new Channel(channelName, description);
+        data.add(channel);
+        return channel;
+    }
+
+    @Override
+    public Channel findId(UUID id) {
+        return data.stream()
+                .filter(c -> c.getId().equals(id) )
+                .findFirst()
+                .orElse(null);
+    }
+
+    @Override
+    public List<Channel> findAll() {
+        return data;
+    }
+
+    @Override
+    public Channel update(UUID id, String channelName, String description) {
+        Channel channel = findId(id);
+        if(channel == null) {
+            System.out.println("존재하지 않는 채널입니다.");
+            return null;
+        }
+        channel.update(id, channelName, description);
+        return channel;
+    }
+
+    @Override
+    public void delete(UUID id) {
+        Channel channel = findId(id);
+        if(channel == null) {
+            throw new IllegalArgumentException("없는 채널입니다.");
+        }
+        data.remove(channel);
+    }
+}
diff --git a/discodeit/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFMessageService.java b/discodeit/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFMessageService.java
new file mode 100644
index 00000000..dc1d04ea
--- /dev/null
+++ b/discodeit/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFMessageService.java
@@ -0,0 +1,56 @@
+package main.java.com.sprint.mission.discodeit.service.jcf;
+
+import main.java.com.sprint.mission.discodeit.entity.Message;
+import main.java.com.sprint.mission.discodeit.service.MessageService;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+
+public class JCFMessageService implements MessageService {
+    public List<Message> data = new ArrayList<>(); //모든 메시지를 담는 data
+
+
+    @Override
+    public Message create(String msgText, UUID senderId, UUID channelId) {
+        Message message = new Message(msgText, senderId,channelId);
+        data.add(message);
+
+        return message;
+    }
+
+
+    @Override
+    public Message findId(UUID id) {
+        for (Message message : data) {
+            if (message.getId().equals(id)) {
+                return  message;
+            }
+        }
+
+        throw new IllegalArgumentException("존재하지 않는 유저입니다.");
+    }
+
+    @Override
+    public List<Message> findAll()
+    {
+        return new ArrayList<>(data);
+    }
+
+    @Override
+    public Message update(UUID id, String msgText) {
+        Message message = findId(id);
+        if(message == null){
+            System.out.println("존재하지 않는 메시지입니다.");
+            return null;
+        }
+        message.update(msgText);
+        return message;
+    }
+
+    @Override
+    public void delete(UUID id) {
+        Message message = findId(id);
+        data.remove(message);
+    }
+}
diff --git a/discodeit/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFUserService.java b/discodeit/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFUserService.java
new file mode 100644
index 00000000..40ae08d5
--- /dev/null
+++ b/discodeit/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFUserService.java
@@ -0,0 +1,55 @@
+package main.java.com.sprint.mission.discodeit.service.jcf;
+
+import main.java.com.sprint.mission.discodeit.entity.User;
+import main.java.com.sprint.mission.discodeit.service.UserService;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+
+public class JCFUserService implements UserService {
+    public List<User> data = new ArrayList<>();
+
+
+    @Override
+    public User create(String name, String email, String phoneNumber) {
+        User user = new User(name, email, phoneNumber);
+        data.add(user);
+        return user;
+    }
+
+    @Override
+    public User update(UUID id, String name, String email, String phoneNumber) {
+        User user = findId(id);
+        if (user == null) {
+            System.out.println("존재하지 않는 사용자입니다.");
+            return null;
+        }
+        user.update(name, email, phoneNumber);
+        return user;
+    }
+
+    @Override
+    public void delete(UUID id) {
+        User user = findId(id);
+        if(user == null) {
+            throw new IllegalArgumentException("없는 정보입니다.");
+        }
+        data.remove(user);
+    }
+
+    @Override
+    public List<User> findAll() {
+        return data;
+    }
+
+    @Override
+    public User findId(UUID id) {
+        for(User user : data) {
+            if(user.getId().equals(id)){
+                return user;
+            }
+        }
+        throw new IllegalArgumentException("존재하지 않는 유저입니다.");
+    }
+}
\ No newline at end of file
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