check_style.xml

<?xml version="1.0"?>
 <!DOCTYPE module PUBLIC
   "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
   "https://checkstyle.org/dtds/configuration_1_3.dtd">
<!--keep the file in project root although NetBeans 8.0.2 doesn't find it there and allow to add additional project files (don't skip a proper project structure in favour of IDE deficies)-->
<!-- Migrated from Checkstyle 6.18 to 14.x in 2026-09 with the same rules (see REFRESH_PLAN.md, Stage A6) -->
<module name="Checker">
	<!-- Was inside TreeWalker before Checkstyle 8.24 -->
	<module name="LineLength">
		<property name="fileExtensions" value="java"/>
		<property name="max" value="180"/>
	</module>
    <module name="TreeWalker">
        <!-- Public methods longer than 2 lines must have Javadoc (was part of JavadocMethod before Checkstyle 8.20) -->
        <module name="MissingJavadocMethod">
            <property name="scope" value="public"/>
            <property name="severity" value="error"/>
            <property name="allowMissingPropertyJavadoc" value="true"/>
            <property name="minLineCount" value="2"/>
            <property name="tokens" value="METHOD_DEF"/>
        </module>
        <!-- Checks the Javadoc of a method: @param/@return tags of existing Javadoc. -->
        <module name="JavadocMethod">
            <property name="accessModifiers" value="public"/>
            <property name="severity" value="error"/>
            <property name="tokens" value="METHOD_DEF"/>
        </module>
        <!-- Public types must have Javadoc (was part of JavadocType before Checkstyle 8.20) -->
        <module name="MissingJavadocType">
            <property name="scope" value="public"/>
            <property name="severity" value="error"/>
        </module>
        <!-- Checks Javadoc comments for class and interface definitions. -->
        <module name="JavadocType">
            <property name="scope" value="public"/>
            <property name="severity" value="error"/>
        </module>
        <!-- Checks for Naming Conventions.              -->
        <!-- See https://checkstyle.org/checks/naming/index.html -->
        <!-- Sun Naming Conventions -->
        <module name="ConstantName"/>
        <module name="LocalFinalVariableName"/>
        <module name="LocalVariableName"/>
        <module name="MemberName"/>
        <module name="MethodName"/>
        <module name="PackageName"/>
        <module name="ParameterName"/>
        <module name="StaticVariableName"/>
        <module name="TypeName"/>
        <module name="TypeName">
		    <property name="format"
		              value="^I[a-zA-Z0-9]*$"/>
		    <property name="tokens"
		              value="INTERFACE_DEF"/>
		</module>
		<module name="InterfaceTypeParameterName"/>
		<module name="MethodTypeParameterName"/>
		<module name="ClassTypeParameterName"/>
		<module name="AnonInnerLength">
            <property name="max" value="100"/>
		</module>
		<module name="ArrayTypeStyle"/>
		<module name="EmptyStatement"/>
		<module name="EqualsHashCode"/>
		<module name="HideUtilityClassConstructor"/>
		<module name="MethodLength">
		    <property name="max" value="200"/>
		</module>
		<module name="NestedIfDepth">
		    <property name="max" value="3"/>
		</module>
		<module name="NestedTryDepth"/>
		<module name="StringLiteralEquality"/>
		<module name="UncommentedMain"/>
        <!-- Specify method parameters code conventions -->
        <!--<module name="MethodParamPad">
             Whitespace is required after method name 
            <property name="option" value="space" />
             Check only methods and constructors declarations 
            <property name="tokens" value="METHOD_DEF, CTOR_DEF" />
        </module>  -->
        <!-- Checks the policy on the padding of parentheses; i.e. whether a space is required after a left parenthesis and before a
        right parenthesis, or such spaces are forbidden. -->
        <!--<module name="ParenPad">
            Whitespace required before ')' and after ')' 
            <property name="option" value="space"/>
        </module>  -->
    </module>
	<module name="Translation"/>
	<module name="UniqueProperties"/>
	<module name="JavadocPackage"/>
</module>