checkstyle.xml

<?xml version="1.0"?>
<!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">
        <property name="eachLine" value="true"/>
    </module>

    <module name="RegexpSingleline">
        <!-- \s matches whitespace character, $ matches end of line. -->
        <property name="format" value="\s+$"/>
        <property name="message" value="Line has trailing spaces."/>
    </module>

    <module name="TreeWalker">

        <!-- Checks for imports                              -->
        <module name="AvoidStarImport">
            <property name="allowStaticMemberImports" value="true"/>
        </module>
        <module name="RedundantImport"/>

        <module name="UnusedImports">
            <property name="processJavadoc" value="true" />
        </module>

        <!-- Modifier Checks                                    -->
        <module name="ModifierOrder"/>
        <module name="RedundantModifier"/>

        <!-- Checks for blocks.                              -->
        <!--<module name="LeftCurly">
            <property name="option" value="eol"/>
        </module>
        <module name="NeedBraces"/>
        <module name="RightCurly">
            <property name="option" value="same"/>
        </module>

        <module name="TypecastParenPad"/>
        <module name="WhitespaceAfter"/>
        <module name="WhitespaceAround"/>-->

        <!-- Checks for common coding problems               -->
        <module name="EmptyStatement"/>
        <module name="EqualsHashCode"/>
        <module name="IllegalInstantiation"/>

        <!-- final parameters check, enabled only for constructors -->
        <module name="FinalParameters">
            <property name="tokens" value="CTOR_DEF"/>
        </module>

        <!-- Miscellaneous other checks.                   -->
        <module name="UpperEll"/>
        <module name="PackageAnnotation"/>
        <module name="CovariantEquals"/>
        <module name="ArrayTypeStyle"/>

        <!-- Checks for System.out -->
        <module name="RegexpSinglelineJava">
            <property name="format" value="System\.out"/>
            <property name="ignoreComments" value="true"/>
        </module>

        <module name="RegexpSinglelineJava">
            <property name="format" value="System\.err"/>
            <property name="ignoreComments" value="true"/>
        </module>

        <!--  Checks for printStackTrace  -->
        <module name="RegexpSinglelineJava">
            <property name="format" value="printStackTrace\(\)"/>
            <property name="ignoreComments" value="true"/>
        </module>

        <module name="SuppressionCommentFilter">
            <property name="offCommentFormat" value="CHECKSTYLE.OFF\: ([\w\|]+)"/>
            <property name="onCommentFormat" value="CHECKSTYLE.ON\: ([\w\|]+)"/>
            <property name="checkFormat" value="$1"/>
        </module>

    </module>

</module>