checks.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE module PUBLIC
        "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
        "http://www.puppycrawl.com/dtds/configuration_1_3.dtd">
<module name="Checker">
    <module name="FileTabCharacter"/>
    <module name="RegexpMultiline">
        <property name="format" value="\r"/>
        <property name="message" value="Line contains carriage return"/>
    </module>
    <module name="RegexpMultiline">
        <property name="format" value="\n\n\n"/>
        <property name="message" value="Multiple consecutive blank lines"/>
    </module>
    <module name="RegexpMultiline">
        <property name="format" value="Preconditions\.checkNotNull"/>
        <property name="message" value="Use of checkNotNull"/>
    </module>
    <module name="RegexpMultiline">
        <property name="format" value="\/\/\s*\n"/>
        <property name="message" value="A comment must contains some content"/>
    </module>
    <module name="RegexpMultiline">
        <property name="format" value="(^\s{2}(public|private|protected|).*\([^\)]+\)\n(\s{1,3}|\s{5,})throws)"/>
        <property name="message" value="Throws must be in the new line next to method"/>
    </module>



    <module name="TreeWalker">
       
        <module name="DefaultComesLast"/>
        <module name="MultipleVariableDeclarations"/>
        <module name="ModifierOrder"/>
        <module name="OneStatementPerLine"/>
        <module name="StringLiteralEquality"/>
        <module name="MutableException"/>
        <module name="EqualsHashCode"/>
        <module name="InnerAssignment"/>
        <module name="InterfaceIsType"/>

        <!-- See http://checkstyle.sf.net/config_naming.html -->
        <module name="LocalVariableName"/>
        <module name="LocalFinalVariableName"/>
        <module name="TypeName">
            <property name="format" value="^[A-Z][a-zA-Z0-9_]*$"/>
        </module>
        <module name="PackageName"/>
        <module name="StaticVariableName"/>
        <module name="MethodTypeParameterName">
            <property name="format" value="^[A-Z][0-9]?$"/>
        </module>

        <!-- See http://checkstyle.sf.net/config_import.html -->
        <module name="AvoidStarImport"/>
        <module name="RedundantImport"/>
        <module name="UnusedImports"/>
        <module name="ImportOrder">
            <property name="groups" value="*,javax,java"/>
            <property name="separated" value="true"/>
            <property name="option" value="bottom"/>
            <property name="sortStaticImportsAlphabetically" value="true"/>
        </module>

        <!-- Checks for Size Violations.                    -->
        <!-- See http://checkstyle.sf.net/config_sizes.html -->
        <module name="LineLength">
            <property name="max" value="121"/>
            <property name="ignorePattern" value=".*\x3c.*\x3e"/>
        </module>

        <module name="EmptyLineSeparator">
            <property name="tokens" value="METHOD_DEF, IMPORT, CLASS_DEF, INTERFACE_DEF, ENUM_DEF, STATIC_INIT, INSTANCE_INIT, METHOD_DEF, CTOR_DEF"/>
        </module>

        <!-- See http://checkstyle.sourceforge.net/config_whitespace.html -->
        <module name="MethodParamPad">
            <property name="allowLineBreaks" value="true"/>
            <property name="option" value="nospace"/>
        </module>
        <module name="NoLineWrap"/>
        <module name="NoWhitespaceBefore"/>
        <module name="ParenPad"/>
        <module name="TypecastParenPad"/>
        <module name="SeparatorWrap">
            <property name="tokens" value="COMMA"/>
        </module>
        <module name="WhitespaceAfter"/>
        <module name="WhitespaceAround">
            <property name="allowEmptyConstructors" value="true"/>
            <property name="allowEmptyMethods" value="true"/>
            <property name="ignoreEnhancedForColon" value="false"/>
            <property name="tokens" value="
                ASSIGN, BAND, BAND_ASSIGN, BOR, BOR_ASSIGN, BSR, BSR_ASSIGN,
                BXOR, BXOR_ASSIGN, COLON, DIV, DIV_ASSIGN, EQUAL, GT, LAND,
                LITERAL_ASSERT, LITERAL_CATCH, LITERAL_DO, LITERAL_ELSE,
                LITERAL_FINALLY, LITERAL_FOR, LITERAL_IF, LITERAL_RETURN,
                LITERAL_SYNCHRONIZED, LITERAL_TRY, LITERAL_WHILE,
                LOR, LT, MINUS, MINUS_ASSIGN, MOD, MOD_ASSIGN, NOT_EQUAL,
                PLUS, PLUS_ASSIGN, QUESTION, SL, SLIST, SL_ASSIGN, SR, SR_ASSIGN,
                STAR, STAR_ASSIGN, TYPE_EXTENSION_AND"/>
        </module>
        <module name="EmptyStatement"/>
        <module name="EmptyForInitializerPad"/>
        <module name="EmptyForIteratorPad">
            <property name="option" value="space"/>
        </module>

        <!-- See http://checkstyle.sf.net/config_blocks.html -->
        <module name="EmptyCatchBlock">
            <property name="commentFormat" value="This is expected"/>
        </module>
        <module name="EmptyBlock">
            <property name="option" value="text"/>
            <property name="tokens" value="
                LITERAL_DO, LITERAL_ELSE, LITERAL_FINALLY, LITERAL_IF,
                LITERAL_FOR, LITERAL_TRY, LITERAL_WHILE, INSTANCE_INIT, STATIC_INIT"/>
        </module>
        <module name="NeedBraces"/>
        <module name="LeftCurly"/>
        <module name="RightCurly">
            <property name="option" value="alone"/>
            <property name="tokens" value="
                 CLASS_DEF, METHOD_DEF, CTOR_DEF, LITERAL_FOR, LITERAL_WHILE, LITERAL_DO, STATIC_INIT, INSTANCE_INIT"/>
        </module>
        <module name="RightCurly"/>

        <!-- See http://checkstyle.sf.net/config_misc.html -->
        <module name="UpperEll"/>
        <module name="ArrayTypeStyle"/>

    </module>
</module>