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="charset" value="UTF-8"/>
    <property name="severity" value="warning"/>
    <property name="fileExtensions" value="java"/>

    <!-- Size Violations -->
    <module name="FileLength">
        <property name="max" value="2000"/>
    </module>
    <module name="LineLength">
        <property name="max" value="120"/>
    </module>

    <!-- TreeWalker for detailed checks -->
    <module name="TreeWalker">
        <!-- Basic checks -->
        <module name="OuterTypeFilename"/>
        <module name="IllegalTokenText"/>
        <module name="AvoidEscapedUnicodeCharacters"/>
        
        <!-- Naming Conventions -->
        <module name="PackageName"/>
        <module name="TypeName"/>
        <module name="MemberName"/>
        <module name="ParameterName"/>
        <module name="LocalVariableName"/>
        <module name="ClassTypeParameterName"/>
        <module name="MethodTypeParameterName"/>
        <module name="InterfaceTypeParameterName"/>
        
        <!-- Code blocks -->
        <module name="EmptyBlock"/>
        <module name="NeedBraces"/>
        <module name="LeftCurly"/>
        <module name="RightCurly"/>
        
        <!-- Whitespace -->
        <module name="WhitespaceAround"/>
        <module name="OneStatementPerLine"/>
        <module name="MultipleVariableDeclarations"/>
        <module name="ArrayTypeStyle"/>
        
        <!-- Code Quality -->
        <module name="NoFinalizer"/>
        <module name="GenericWhitespace"/>
        <module name="Indentation">
            <property name="basicOffset" value="4"/>
        </module>
        <module name="AbbreviationAsWordInName">
            <property name="ignoreFinal" value="true"/>
            <property name="allowedAbbreviationLength" value="1"/>
        </module>
        <module name="OverloadMethodsDeclarationOrder"/>
        <module name="VariableDeclarationUsageDistance"/>
        <module name="CustomImportOrder"/>

        <module name="FinalParameters">
            <property name="ignorePrimitiveTypes" value="false"/>
        </module>

        <!-- Javadoc -->
        <module name="JavadocMethod">
            <property name="allowMissingParamTags" value="true"/>
            <property name="allowMissingReturnTag" value="true"/>
        </module>
        <module name="JavadocType"/>
        <module name="JavadocStyle"/>
        
        <!-- Error Prevention -->
        <module name="EmptyStatement"/>
        <module name="EqualsHashCode"/>
        <module name="HiddenField"/>
        <module name="FinalLocalVariable"/>
        <module name="MagicNumber">
            <property name="ignoreNumbers" value="-1, 0, 1, 2"/>
        </module>
    </module>
</module>