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">
    <property name="severity" value="warning" />
    <property name="fileExtensions" value="java" />

    <!-- Checks for Size Violations -->
    <module name="FileLength">
        <property name="max" value="500" />
    </module>
    <module name="LineLength">
        <property name="max" value="120" />
    </module>

    <module name="TreeWalker">
        <!-- Checks for Naming Conventions -->
        <module name="MethodName" />
        <module name="PackageName" />
        <module name="TypeName" />
        <module name="ParameterName" />
        <module name="LocalVariableName" />
        <module name="MemberName" />

        <!-- Checks for imports -->
        <module name="AvoidStarImport" />
        <module name="IllegalImport" />
        <module name="RedundantImport" />
        <module name="UnusedImports" />

        <!-- Checks for Size Violations -->
        <module name="MethodLength">
            <property name="max" value="50" />
        </module>

        <!-- Checks for whitespace -->
        <module name="EmptyLineSeparator" />
        <module name="GenericWhitespace" />
        <module name="MethodParamPad" />
        <module name="NoWhitespaceAfter" />
        <module name="NoWhitespaceBefore" />
        <module name="ParenPad" />
        <module name="TypecastParenPad" />
        <module name="WhitespaceAfter" />
        <module name="WhitespaceAround" />

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

        <!-- Checks for blocks -->
        <module name="EmptyBlock" />
        <module name="LeftCurly" />
        <module name="RightCurly" />
        <module name="NeedBraces" />

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