diff --git a/protobuf/README.md b/protobuf/README.md
index 314e8797f..ee4f01855 100644
--- a/protobuf/README.md
+++ b/protobuf/README.md
@@ -6,7 +6,7 @@ This folder contains the [Protocol Buffer](https://developers.google.com/protoco
 
 Check out the [Flow Access API specification](/docs/content/access-api-spec.md).
 
-## Generating stubs
+## Generating Go stubs
 
 You can use [prototool](https://github.com/uber/prototool) to generate gRPC client stubs in a variety of languages.
 
@@ -15,3 +15,19 @@ Running the command below (in the current directory) will generate stubs for Go:
 ```shell script
 make generate
 ```
+
+## Generating and publishing JVM stubs
+
+JVM support is in the alpha stage; many steps require manual intervention.
+
+`./gradlew generateProto` compiles Protobuf files into local Java classes.
+
+### Publishing
+
+`./gradlew publishToSonatype` prepares and publishes compiled classes into JAR and uploads to OSSRH staging repository. 
+
+This require signing artifacts which is done by [Signing Gradle plugin](https://docs.gradle.org/current/userguide/signing_plugin.html) - it requires 
+external configuration and appropriate GPG Keys. Please refer to plugin and [OSSRH](https://central.sonatype.org/pages/working-with-pgp-signatures.html) 
+documentation.
+Uploading to staging repo requires an approved Sonatype account. Please refer to [Gradle Nexus Publish Plugin](https://github.com/gradle-nexus/publish-plugin) 
+documentation how to provide credentials. 
diff --git a/protobuf/build.gradle b/protobuf/build.gradle
deleted file mode 100644
index 511c4cf8c..000000000
--- a/protobuf/build.gradle
+++ /dev/null
@@ -1,10 +0,0 @@
-apply plugin: 'java'
-apply plugin: 'maven'
-
-jar {
-    from("flow") {
-        into "proto/"
-    }
-}
-
-group = 'org.onflow.flow-jvm'
diff --git a/protobuf/build.gradle.kts b/protobuf/build.gradle.kts
new file mode 100644
index 000000000..9e98f8e3f
--- /dev/null
+++ b/protobuf/build.gradle.kts
@@ -0,0 +1,108 @@
+import com.google.protobuf.gradle.*
+
+
+plugins {
+    id("com.google.protobuf") version "0.8.15"
+    `java-library`
+    `maven-publish`
+    signing
+    id("io.github.gradle-nexus.publish-plugin") version "1.0.0"
+}
+
+val protobufVersion = "3.14.0"
+val grpcVersion = "1.35.0"
+
+protobuf {
+    protoc {
+        artifact = "com.google.protobuf:protoc:$protobufVersion"
+    }
+    plugins {
+        id("grpc") {
+            artifact = "io.grpc:protoc-gen-grpc-java:$grpcVersion"
+        }
+    }
+    generateProtoTasks {
+        all().forEach {
+            it.plugins {
+                id("grpc")
+            }
+        }
+    }
+}
+
+dependencies {
+    api("com.google.protobuf:protobuf-java:$protobufVersion")
+    api("io.grpc:grpc-netty-shaded:$grpcVersion")
+    api("io.grpc:grpc-protobuf:$grpcVersion")
+    api("io.grpc:grpc-stub:$grpcVersion")
+    api("javax.annotation:javax.annotation-api:1.3.2")
+}
+
+nexusPublishing {
+    repositories {
+        sonatype()
+    }
+}
+
+publishing {
+    publications {
+        create<MavenPublication>("mavenJava") {
+            from(components["java"])
+
+            pom {
+                licenses {
+                    license {
+                        name.set("The Apache License, Version 2.0")
+                        url.set("http://www.apache.org/licenses/LICENSE-2.0.txt")
+                    }
+                }
+                name.set(project.name)
+                url.set("https://onflow.org")
+                description.set("The Flow Blockchain")
+                scm {
+                    url.set("https://github.com/onflow/flow")
+                    connection.set("scm:git:git@github.com/onflow/flow.git")
+                    developerConnection.set("scm:git:git@github.com/onflow/flow.git")
+                }
+                developers {
+                    developer {
+                        name.set("Flow Developers")
+                        url.set("https://onflow.org")
+                    }
+                }
+            }
+        }
+    }
+}
+
+signing {
+    useGpgCmd() //use gpg2
+    sign(publishing.publications["mavenJava"])
+}
+
+sourceSets {
+    main {
+        proto {
+            // protobuf files must be defined in this dir, but using default filters
+            // will include build dir, so we override inclusion pattern while maintaining
+            // proto root dir
+            srcDirs("$projectDir/")
+            setIncludes(listOf("flow/**/*.proto"))
+        }
+    }
+}
+
+java {
+    withJavadocJar()
+    withSourcesJar()
+}
+
+
+repositories {
+    mavenCentral()
+}
+
+group = "org.onflow"
+
+// TODO - grab version from Git
+version = "0.20"
diff --git a/protobuf/flow/access/access.proto b/protobuf/flow/access/access.proto
index 6692677db..51ea1acfa 100644
--- a/protobuf/flow/access/access.proto
+++ b/protobuf/flow/access/access.proto
@@ -3,6 +3,7 @@ syntax = "proto3";
 package flow.access;
 
 option go_package = "access";
+option java_package = "org.onflow.protobuf.access";
 
 import "flow/entities/account.proto";
 import "flow/entities/block_header.proto";
diff --git a/protobuf/flow/entities/account.proto b/protobuf/flow/entities/account.proto
index 30926de91..272be2905 100644
--- a/protobuf/flow/entities/account.proto
+++ b/protobuf/flow/entities/account.proto
@@ -3,6 +3,7 @@ syntax = "proto3";
 package flow.entities;
 
 option go_package = "entities";
+option java_package = "org.onflow.protobuf.entities";
 
 message Account {
   bytes address = 1;
diff --git a/protobuf/flow/entities/block.proto b/protobuf/flow/entities/block.proto
index 43b8221a7..43124c354 100644
--- a/protobuf/flow/entities/block.proto
+++ b/protobuf/flow/entities/block.proto
@@ -3,6 +3,7 @@ syntax = "proto3";
 package flow.entities;
 
 option go_package = "entities";
+option java_package = "org.onflow.protobuf.entities";
 
 import "google/protobuf/timestamp.proto";
 
diff --git a/protobuf/flow/entities/block_header.proto b/protobuf/flow/entities/block_header.proto
index 153916a92..80dedb81f 100644
--- a/protobuf/flow/entities/block_header.proto
+++ b/protobuf/flow/entities/block_header.proto
@@ -3,6 +3,7 @@ syntax = "proto3";
 package flow.entities;
 
 option go_package = "entities";
+option java_package = "org.onflow.protobuf.entities";
 
 import "google/protobuf/timestamp.proto";
 
diff --git a/protobuf/flow/entities/block_seal.proto b/protobuf/flow/entities/block_seal.proto
index c306c784f..0c19f8c53 100644
--- a/protobuf/flow/entities/block_seal.proto
+++ b/protobuf/flow/entities/block_seal.proto
@@ -3,6 +3,7 @@ syntax = "proto3";
 package flow.entities;
 
 option go_package = "entities";
+option java_package = "org.onflow.protobuf.entities";
 
 message BlockSeal {
   bytes block_id = 1;
diff --git a/protobuf/flow/entities/collection.proto b/protobuf/flow/entities/collection.proto
index 7aded5193..dfc615e68 100644
--- a/protobuf/flow/entities/collection.proto
+++ b/protobuf/flow/entities/collection.proto
@@ -3,6 +3,7 @@ syntax = "proto3";
 package flow.entities;
 
 option go_package = "entities";
+option java_package = "org.onflow.protobuf.entities";
 
 message Collection {
   bytes id = 1;
diff --git a/protobuf/flow/entities/event.proto b/protobuf/flow/entities/event.proto
index 9ceefa3cc..773881263 100644
--- a/protobuf/flow/entities/event.proto
+++ b/protobuf/flow/entities/event.proto
@@ -3,6 +3,7 @@ syntax = "proto3";
 package flow.entities;
 
 option go_package = "entities";
+option java_package = "org.onflow.protobuf.entities";
 
 message Event {
   string type = 1;
diff --git a/protobuf/flow/entities/transaction.proto b/protobuf/flow/entities/transaction.proto
index 93edb0ba6..81a19c3e7 100644
--- a/protobuf/flow/entities/transaction.proto
+++ b/protobuf/flow/entities/transaction.proto
@@ -3,6 +3,7 @@ syntax = "proto3";
 package flow.entities;
 
 option go_package = "entities";
+option java_package = "org.onflow.protobuf.entities";
 
 enum TransactionStatus {
   UNKNOWN = 0;
diff --git a/protobuf/flow/execution/execution.proto b/protobuf/flow/execution/execution.proto
index 6f8be2f48..5f8ddad9b 100644
--- a/protobuf/flow/execution/execution.proto
+++ b/protobuf/flow/execution/execution.proto
@@ -3,6 +3,7 @@ syntax = "proto3";
 package flow.execution;
 
 option go_package = "execution";
+option java_package = "org.onflow.protobuf.execution";
 
 import "flow/entities/account.proto";
 import "flow/entities/event.proto";
diff --git a/protobuf/flow/legacy/access/access.proto b/protobuf/flow/legacy/access/access.proto
index 9aa9e081c..d3beb5468 100644
--- a/protobuf/flow/legacy/access/access.proto
+++ b/protobuf/flow/legacy/access/access.proto
@@ -2,6 +2,8 @@ syntax = "proto3";
 
 package access;
 
+option java_package = "org.onflow.protobuf.legacy.access";
+
 import "flow/legacy/entities/account.proto";
 import "flow/legacy/entities/block_header.proto";
 import "flow/legacy/entities/block.proto";
diff --git a/protobuf/flow/legacy/entities/account.proto b/protobuf/flow/legacy/entities/account.proto
index 730b37d19..25a4bc59b 100644
--- a/protobuf/flow/legacy/entities/account.proto
+++ b/protobuf/flow/legacy/entities/account.proto
@@ -2,6 +2,8 @@ syntax = "proto3";
 
 package entities;
 
+option java_package = "org.onflow.protobuf.legacy.entities";
+
 message Account {
   bytes address = 1;
   uint64 balance = 2;
diff --git a/protobuf/flow/legacy/entities/block.proto b/protobuf/flow/legacy/entities/block.proto
index e36dd88a6..8104a42b7 100644
--- a/protobuf/flow/legacy/entities/block.proto
+++ b/protobuf/flow/legacy/entities/block.proto
@@ -2,6 +2,8 @@ syntax = "proto3";
 
 package entities;
 
+option java_package = "org.onflow.protobuf.legacy.entities";
+
 import "google/protobuf/timestamp.proto";
 
 import "flow/legacy/entities/collection.proto";
diff --git a/protobuf/flow/legacy/entities/block_header.proto b/protobuf/flow/legacy/entities/block_header.proto
index 38c8afb18..d7af19043 100644
--- a/protobuf/flow/legacy/entities/block_header.proto
+++ b/protobuf/flow/legacy/entities/block_header.proto
@@ -2,6 +2,8 @@ syntax = "proto3";
 
 package entities;
 
+option java_package = "org.onflow.protobuf.legacy.entities";
+
 import "google/protobuf/timestamp.proto";
 
 message BlockHeader {
diff --git a/protobuf/flow/legacy/entities/block_seal.proto b/protobuf/flow/legacy/entities/block_seal.proto
index 6989735b4..2c5e3bb8f 100644
--- a/protobuf/flow/legacy/entities/block_seal.proto
+++ b/protobuf/flow/legacy/entities/block_seal.proto
@@ -2,6 +2,8 @@ syntax = "proto3";
 
 package entities;
 
+option java_package = "org.onflow.protobuf.legacy.entities";
+
 message BlockSeal {
   bytes block_id = 1;
   bytes execution_receipt_id = 2;
diff --git a/protobuf/flow/legacy/entities/collection.proto b/protobuf/flow/legacy/entities/collection.proto
index 3bb9bba0e..08b28cf2a 100644
--- a/protobuf/flow/legacy/entities/collection.proto
+++ b/protobuf/flow/legacy/entities/collection.proto
@@ -2,6 +2,8 @@ syntax = "proto3";
 
 package entities;
 
+option java_package = "org.onflow.protobuf.legacy.entities";
+
 message Collection {
   bytes id = 1;
   repeated bytes transaction_ids = 2;
diff --git a/protobuf/flow/legacy/entities/event.proto b/protobuf/flow/legacy/entities/event.proto
index 7283a1822..7d7733288 100644
--- a/protobuf/flow/legacy/entities/event.proto
+++ b/protobuf/flow/legacy/entities/event.proto
@@ -2,6 +2,8 @@ syntax = "proto3";
 
 package entities;
 
+option java_package = "org.onflow.protobuf.legacy.entities";
+
 message Event {
   string type = 1;
   bytes transaction_id = 2;
diff --git a/protobuf/flow/legacy/entities/transaction.proto b/protobuf/flow/legacy/entities/transaction.proto
index 11e4d85a7..fdc086c42 100644
--- a/protobuf/flow/legacy/entities/transaction.proto
+++ b/protobuf/flow/legacy/entities/transaction.proto
@@ -2,6 +2,8 @@ syntax = "proto3";
 
 package entities;
 
+option java_package = "org.onflow.protobuf.legacy.entities";
+
 enum TransactionStatus {
   UNKNOWN = 0;
   PENDING = 1;
diff --git a/protobuf/flow/legacy/execution/execution.proto b/protobuf/flow/legacy/execution/execution.proto
index f12db6af4..320500795 100644
--- a/protobuf/flow/legacy/execution/execution.proto
+++ b/protobuf/flow/legacy/execution/execution.proto
@@ -2,6 +2,8 @@ syntax = "proto3";
 
 package execution;
 
+option java_package = "org.onflow.protobuf.legacy.execution";
+
 import "flow/legacy/entities/account.proto";
 import "flow/legacy/entities/event.proto";
 
diff --git a/protobuf/settings.gradle.kts b/protobuf/settings.gradle.kts
new file mode 100644
index 000000000..cc37a49dc
--- /dev/null
+++ b/protobuf/settings.gradle.kts
@@ -0,0 +1 @@
+rootProject.name="flow"