checkstyle.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.1//EN"
        "http://www.puppycrawl.com/dtds/configuration_1_1.dtd">

<!-- A set of Checkstyle rules that should be applied to non-legacy modules that should adhere to relatively strict
     code style rules. -->
<module name="Checker">

    <property name="severity" value="error"/>

    <!-- Whitespace checks http://checkstyle.sourceforge.net/config_whitespace.html -->
    <module name="FileTabCharacter"/>

    <!-- Regex checks - http://checkstyle.sourceforge.net/config_regexp.html -->
    <module name="RegexpSingleline">
        <property name="format" value="System\.(out|err)\.print"/>
        <property name="message"
                  value="System.out.println and System.err.println are not allowed. Using logging instead."/>
    </module>

    <module name="RegexpSingleline">
        <property name="format" value="\.printStackTrace\(\)"/>
        <property name="message"
                  value="Calls to Throwable.printStackTrace() are not allowed. Log the exception instead."/>
    </module>

    <!--
        Along with the FileContentsHolder module, allows for adding comments to source code to suppress checks.
        http://checkstyle.sourceforge.net/config.html#Filters
    -->
    <module name="SuppressionCommentFilter"/>

    <module name="TreeWalker">

        <!--
            Along with the SuppressionCommentFilter module, allows for adding comments to source code to suppress checks.
            http://checkstyle.sourceforge.net/config.html#Filters
        -->
        <module name="FileContentsHolder"/>

        <!-- Import checks - http://checkstyle.sourceforge.net/config_imports.html -->
        <module name="UnusedImports"/>

        <!-- Block checks - http://checkstyle.sourceforge.net/config_blocks.html -->
        <module name="LeftCurly">
            <property name="option" value="eol"/>
        </module>
        <module name="RightCurly">
            <property name="option" value="same"/>
        </module>
        <module name="NeedBraces"/>

        <!-- Size checks - http://checkstyle.sourceforge.net/config_sizes.html -->
        <module name="LineLengthCheck">
            <property name="max" value="130"/>
            <property name="tabWidth" value="4"/>
            <property name="ignorePattern" value="^import"/>
        </module>

        <!-- Metrics checks - http://checkstyle.sourceforge.net/config_metrics.html -->
        <module name="JavaNCSS">
            <property name="methodMaximum" value="70"/>
            <property name="classMaximum" value="500"/>
        </module>
        <module name="CyclomaticComplexity">
            <property name="max" value="15"/>
        </module>
        <!--<module name="NPathComplexity">-->
            <!--<property name="max" value="50"/>-->
        <!--</module>-->

        <!-- Coding checks http://checkstyle.sourceforge.net/config_coding.html -->
        <module name="EqualsHashCode"/>
        <module name="SimplifyBooleanExpression"/>
        <module name="SimplifyBooleanReturn"/>
        <module name="StringLiteralEquality"/>
        <module name="NestedIfDepth">
            <property name="max" value="2"/>
        </module>
        <module name="NestedTryDepth">
            <property name="max" value="2"/>
        </module>
        <module name="NoFinalizer"/>

    </module>

</module>