checkstyle.xml

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

<!-- Modified (and more strict) version of Bukkit's checkstyle.xml See: https://hub.spigotmc.org/stash/projects/SPIGOT/repos/bukkit/browse/checkstyle.xml -->

<module name="Checker">
	<!-- See http://checkstyle.sourceforge.net/config_misc.html#NewlineAtEndOfFile -->
	<module name="NewlineAtEndOfFile">
		<property name="lineSeparator" value="lf_cr_crlf" />
	</module>

	<!-- See http://checkstyle.sourceforge.net/config_whitespace.html -->
	<module name="FileTabCharacter" />

	<!-- See http://checkstyle.sourceforge.net/config_misc.html -->
	<module name="RegexpSingleline">
		<property name="format" value="\s+$" />
		<property name="minimum" value="0" />
		<property name="maximum" value="0" />
		<property name="message" value="Line has trailing spaces." />
	</module>

	<module name="TreeWalker">
		<!-- See http://checkstyle.sourceforge.net/config_annotation.html -->
		<module name="MissingOverride" />

		<!-- See http://checkstyle.sourceforge.net/config_blocks.html -->
		<module name="AvoidNestedBlocks" />
		<module name="LeftCurly" />
		<module name="NeedBraces">
			<property name="allowEmptyLoopBody" value="true" />
		</module>

		<!-- See https://checkstyle.org/config_javadoc.html -->
		<module name="AtclauseOrder" />
		<module name="InvalidJavadocPosition" />
		<module name="JavadocBlockTagLocation" />
		<module name="JavadocContentLocationCheck" />
		<module name="JavadocMethod" />
		<module name="JavadocStyle">
			<property name="scope" value="public" />
			<property name="excludeScope" value="private" />
		</module>
		<module name="JavadocType" />
		<module name="MissingJavadocPackage" />
		<module name="NonEmptyAtclauseDescription" />

		<!-- See http://checkstyle.sourceforge.net/config_filters.html -->
		<module name="SuppressionCommentFilter" />

		<!-- See http://checkstyle.sourceforge.net/config_imports.html -->
		<module name="AvoidStarImport">
			<property name="allowStaticMemberImports" value="true" />
		</module>
		<module name="ImportOrder">
			<property name="option" value="bottom" />
			<property name="groups"
				value="/^co\./, com, /^java\./, javax, me, net, org, tk, wtf" />
			<property name="ordered" value="true" />
			<property name="separated" value="true" />
			<property name="separatedStaticGroups" value="true" />
			<property name="sortStaticImportsAlphabetically"
				value="true" />
		</module>
		<module name="RedundantImport" />
		<module name="UnusedImports" />

		<!-- See http://checkstyle.sourceforge.net/config_misc.html -->
		<module name="ArrayTypeStyle" />
		<module name="UpperEll" />

		<!-- See https://checkstyle.org/config_whitespace.html -->
		<module name="GenericWhitespace" />
		<module name="MethodParamPad" />
		<module name="NoLineWrap" />
		<module name="NoWhitespaceAfter" />
		<module name="NoWhitespaceBefore">
			<property name="allowLineBreaks" value="true" />
		</module>
		<module name="OperatorWrap" />
		<module name="ParenPad" />
		<module name="SingleSpaceSeparator" />
		<module name="TypecastParenPad" />
		<module name="WhitespaceAfter" />
		<module name="WhitespaceAround">
			<property name="allowEmptyCatches" value="true" />
			<property name="allowEmptyConstructors" value="true" />
			<property name="allowEmptyMethods" value="true" />
			<property name="allowEmptyTypes" value="true" />
		</module>

		<!-- See http://checkstyle.sourceforge.net/config_modifiers.html -->
		<module name="ModifierOrder" />

		<!-- See http://checkstyle.sourceforge.net/config_naming.html -->
		<module name="ClassTypeParameterName" />
		<module name="ConstantName" />
		<module name="InterfaceTypeParameterName" />
		<module name="LambdaParameterName" />
		<module name="LocalFinalVariableName" />
		<module name="LocalVariableName" />
		<module name="MemberName" />
		<module name="MethodName" />
		<module name="MethodTypeParameterName" />
		<module name="PackageName" />
		<module name="ParameterName" />
		<module name="StaticVariableName" />
		<module name="TypeName" />

		<!-- See http://checkstyle.sourceforge.net/config_design.html -->
		<module name="FinalClass" />
		<module name="InterfaceIsType" />
	</module>
</module>