checkstyle.xml

<?xml version="1.0"?><!DOCTYPE module PUBLIC
    "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
    "https://checkstyle.org/dtds/configuration_1_3.dtd">

<module name="Checker">
    <!--module name="NewlineAtEndOfFile"/-->
    <module name="FileLength" />
    <module name="FileTabCharacter" />

    <!-- Trailing spaces -->
    <module name="RegexpSingleline">
        <property name="format" value="\s+$" />
        <property name="message" value="Line has trailing spaces." />
    </module>

    <!-- Space after 'for' and 'if' -->
    <module name="RegexpSingleline">
        <property name="format" value="^\s*(for|if)\b[^ ]" />
        <property name="message" value="Space needed before opening parenthesis." />
    </module>

    <!-- For each spacing -->
    <module name="RegexpSingleline">
        <property name="format" value="^\s*for \(.*?([^ ]:|:[^ ])" />
        <property name="message" value="Space needed around ':' character." />
    </module>

    <module name="TreeWalker">
        <!--<property name="cacheFile" value="${checkstyle.cache.file}"/>-->

        <!-- Checks for Javadoc comments.                     -->
        <!-- See http://checkstyle.sf.net/config_javadoc.html -->
        <!--module name="JavadocMethod"/-->
        <!--module name="JavadocType"/-->
        <!--module name="JavadocVariable"/-->
        <!--module name="JavadocStyle"/-->


        <!-- Checks for Naming Conventions.                  -->
        <!-- See http://checkstyle.sf.net/config_naming.html -->
        <module name="ConstantName" />
        <module name="LocalFinalVariableName" />
        <module name="LocalVariableName">
            <message key="name.invalidPattern"
                value="Local variable name ''{0}'' must match pattern ''{1}''." />
            <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$" />
            <property name="tokens" value="VARIABLE_DEF" />
        </module>
        <module name="MemberName">
            <message key="name.invalidPattern"
                value="Member ''{0}'' must start with a lowercase ''m'' (checked pattern ''{1}'')." />
            <property name="applyToPublic" value="false" />
            <property name="format" value="^m[a-zA-Z0-9]*$" />
        </module>
        <module name="MethodName">
            <property name="format" value="^[a-z][a-zA-Z0-9_]*$" />
        </module>
        <module name="PackageName" />
        <module name="ParameterName" />
        <module name="StaticVariableName">
            <message key="name.invalidPattern"
                value="Member ''{0}'' must start with a lowercase ''s'' (checked pattern ''{1}'')." />
            <property name="format" value="^s[a-zA-Z0-9]*$" />
        </module>
        <module name="TypeName">
            <property name="format" value="^[A-Z][a-zA-Z0-9_]*$" />
        </module>


        <!-- Checks for imports                              -->
        <!-- See http://checkstyle.sf.net/config_import.html -->
        <module name="AvoidStarImport" />
        <module name="IllegalImport" />
        <module name="RedundantImport" />
        <module name="UnusedImports">
            <property name="processJavadoc" value="true" />
        </module>


        <!-- Checks for Size Violations.                    -->
        <!-- See http://checkstyle.sf.net/config_sizes.html -->
        <module name="LineLength">
            <property name="severity" value="warning" />
            <property name="max" value="120" />
            <property name="ignorePattern"
                value="^package.*|^import.*|a href|href|http://|https://|ftp://" />
        </module>
        <!--<module name="MethodLength"/>-->
        <!--<module name="ParameterNumber"/>-->


        <!-- Checks for whitespace                               -->
        <!-- See http://checkstyle.sf.net/config_whitespace.html -->
        <module name="GenericWhitespace" />
        <module name="EmptyForIteratorPad" />
        <module name="MethodParamPad" />
        <module name="NoWhitespaceAfter" />
        <module name="NoWhitespaceBefore" />
        <module name="OperatorWrap" />
        <module name="ParenPad" />
        <module name="TypecastParenPad" />
        <module name="WhitespaceAfter" />
        <module name="WhitespaceAround" />


        <!-- Modifier Checks                                    -->
        <!-- See http://checkstyle.sf.net/config_modifiers.html -->
        <!--module name="ModifierOrder"/-->
        <module name="RedundantModifier" />


        <!-- Checks for blocks. You know, those {}'s         -->
        <!-- See http://checkstyle.sf.net/config_blocks.html -->
        <module name="AvoidNestedBlocks" />
        <!--<module name="EmptyBlock"/>-->
        <module name="LeftCurly" />
        <module name="NeedBraces">
            <property name="tokens" value="LITERAL_DO, LITERAL_ELSE, LITERAL_FOR, LITERAL_WHILE" />
        </module>
        <module name="RightCurly" />


        <!-- Checks for common coding problems               -->
        <!-- See http://checkstyle.sf.net/config_coding.html -->
        <!--<module name="AvoidInlineConditionals"/>-->
        <module name="CovariantEquals" />
        <!--<module name="DoubleCheckedLocking"/>-->
        <module name="EmptyStatement" />
        <module name="EqualsAvoidNull" />
        <module name="EqualsHashCode" />
        <!--<module name="HiddenField"/>-->
        <module name="IllegalInstantiation" />
        <module name="InnerAssignment" />
        <!--<module name="MagicNumber"/>-->
        <module name="MissingSwitchDefault" />
        <!--<module name="RedundantThrows"/>-->
        <module name="SimplifyBooleanExpression" />
        <module name="SimplifyBooleanReturn" />

        <!-- Checks for class design                         -->
        <!-- See http://checkstyle.sf.net/config_design.html -->
        <!--module name="DesignForExtension"/-->
        <!--module name="FinalClass"/-->
        <!--<module name="HideUtilityClassConstructor"/>-->
        <module name="InterfaceIsType" />
        <!--<module name="VisibilityModifier"/>-->


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