checkstyle.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE module PUBLIC "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN" "https://checkstyle.org/dtds/configuration_1_3.dtd">

<!-- This configuration file was written by the eclipse-cs plugin configuration 
	editor -->
<!-- Checkstyle-Configuration: Frank!Framework Description: none -->
<module name="Checker">
	<module name="SuppressionFilter">
		<!-- The property config_loc is automatically set by the eclipse-cs plugin -->
		<property name="file" value="${config_loc}/checkstyle-suppressions.xml"/>
	</module>

	<property name="severity" value="warning" />
	<module name="TreeWalker">
		<property name="fileExtensions" value="java" />
		<property name="severity" value="error" />
		<module name="RedundantImport" />
		<module name="UnusedImports">
			<property name="processJavadoc" value="true" /> <!-- allow imports from javadoc comments -->
		</module>
		<module name="IllegalImport">
			<property name="illegalPkgs" value="
			junit.framework,
			org.apache.commons.lang,
			software.amazon.awssdk.utils,
			javax.activation
			javax.annotation,
			javax.jms,
			javax.servlet,
			javax.ws,
			" />
			<property name="illegalClasses" value="
			org.apache.commons.codec.Charsets,
			org.apache.cxf.helpers.FileUtils"/>
		</module>
		<module name="IllegalImport">
			<property name="illegalPkgs" value="
			org.jetbrains.annotations,
			org.wildfly.common.annotation,
			reactor.util.annotation,
			org.springframework.lang,
			com.mongodb.lang,
			io.micrometer.common.lang,
			org.checkerframework.checker.nullness.qual,
			org.testcontainers.shaded.org.checkerframework.framework.qual,
			" />
			<property name="illegalClasses" value="
			com.sun.istack.Nullable,
			com.sun.istack.NotNull,
			com.unboundid.util.Nullable,
			com.unboundid.util.NotNull,
			" />
		</module>
		<module name="IllegalImport">
			<property name="regexp" value="true" />
			<!-- Reject any org.junit import that's not also org.junit.jupiter or org.junit.platform (junit extensions) -->
			<property name="illegalClasses" value="^org\.junit\.(?!(jupiter)|(platform)\.).+" />
		</module>
		<module name="RegexpSinglelineJava">
			<property name="format" value="\.deleteOnExit()" />
			<property name="message" value="You shouldn't use file.deleteOnExit()!" />
			<property name="ignoreComments" value="true" />
		</module>
	</module>

	<module name="SuppressionSingleFilter">
		<property name="checks" value="UnusedImports"/>
		<property name="files" value="StandardLockService.java"/>
	</module>

	<module name="TreeWalker">
		<property name="severity" value="info" />
		<metadata name="net.sf.eclipsecs.core.lastEnabledSeverity" value="inherit" />
		<module name="AvoidStarImport">
			<property name="allowStaticMemberImports" value="true" />
		</module>

		<module name="EmptyBlock" />
		<module name="ModifierOrder" />
		<module name="RedundantModifier">
			<property name="tokens" value="ANNOTATION_FIELD_DEF" />
		</module>
		<module name="LeftCurly">
			<property name="tokens" value="CLASS_DEF,CTOR_DEF,INTERFACE_DEF,METHOD_DEF,LITERAL_SWITCH,STATIC_INIT" />
		</module>
		<module name="EmptyStatement" />
		<module name="IllegalInstantiation" />
		<module name="UpperEll" />
		<module name="PackageAnnotation" />
		<module name="ArrayTypeStyle" />
		<module name="SuppressWarnings">
			<property name="format" value="^all$" />
		</module>
	</module>

	<module name="TreeWalker">
		<property name="severity" value="warning" />
		<module name="RegexpSinglelineJava">
			<property name="format" value="^\t* " />
			<property name="message" value="Indent must use tab characters." />
			<property name="ignoreComments" value="true" />
		</module>
		<module name="RegexpSinglelineJava">
			<property name="format" value="\s+$" />
			<property name="message" value="Line has trailing spaces." />
			<property name="ignoreComments" value="true" />
		</module>

		<module name="RegexpSinglelineJava">
			<property name="id" value="systemout"/>
			<property name="format" value="^.*System\.(out|err).*$"/>
			<property name="message" value="Don't use System.out/err, use LOG4J2 instead."/>
			<property name="ignoreComments" value="true" />
		</module>
		<module name="MatchXpath">
			<property name="id" value="singleLineCommentStartWithSpace"/>
			<property name="query"
				value="//SINGLE_LINE_COMMENT[./COMMENT_CONTENT[not(starts-with(@text, ' '))
                       and not(@text = '\n') and not(ends-with(@text, '//\n')) ]]"/>
			<message key="matchxpath.match" value="Single line comment text should start with space."/>
		</module>
	</module>
</module>