spring-integration/src/checkstyle/checkstyle.xml

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.2//EN" "http://www.puppycrawl.com/dtds/configuration_1_2.dtd">
<module name="Checker">

	<module name="SuppressionFilter">
		<property name="file" value="src/checkstyle/checkstyle-suppressions.xml" />
	</module>

	<!-- Root Checks -->
	<module name="RegexpHeader">
		<property name="headerFile" value="src/checkstyle/checkstyle-header.txt" />
		<property name="fileExtensions" value="java" />
	</module>

	<module name="NewlineAtEndOfFile">
		<property name="lineSeparator" value="lf"/>
	</module>

	<!-- TreeWalker Checks -->
	<module name="TreeWalker">

		<!-- Annotations -->
 		<module name="AnnotationUseStyle">
 			<property name="elementStyle" value="compact" />
 		</module>
 		<module name="MissingOverride" />
<!-- 		<module name="PackageAnnotation" /> -->
<!-- 		<module name="AnnotationLocation"> -->
<!-- 			<property name="allowSamelineSingleParameterlessAnnotation" -->
<!-- 				value="false" /> -->
<!-- 		</module> -->

		<!-- Block Checks -->
		<module name="EmptyBlock">
			<property name="option" value="text" />
		</module>
		<module name="LeftCurly" />
		<module name="RightCurly">
			<property name="option" value="alone" />
		</module>
		<module name="NeedBraces" />
		<module name="AvoidNestedBlocks" />

		<!-- Class Design -->
		<module name="FinalClass" />
		<module name="InterfaceIsType" />
		<module name="HideUtilityClassConstructor" />
		<module name="MutableException" />
		<module name="InnerTypeLast" />
		<module name="OneTopLevelClass" />

		<!-- Coding -->
		<module name="CovariantEquals" />
		<module name="EmptyStatement" />
		<module name="EqualsHashCode" />
<!-- 		<module name="InnerAssignment" /> -->
		<module name="SimplifyBooleanExpression" />
		<module name="SimplifyBooleanReturn" />
		<module name="StringLiteralEquality" />
		<module name="NestedForDepth">
			<property name="max" value="3" />
		</module>
		<module name="NestedIfDepth">
			<property name="max" value="4" />
		</module>
		<module name="NestedTryDepth">
			<property name="max" value="3" />
		</module>
		<module name="MultipleVariableDeclarations" />
		<module name="RequireThis">
			<property name="validateOnlyOverlapping" value="false" />
			<property name="checkMethods" value="false" />
		</module>
		<module name="OneStatementPerLine" />

		<!-- Imports -->
		<module name="AvoidStarImport" />
		<module name="AvoidStaticImport">
			<property name="excludes"
				value="org.custommonkey.xmlunit.XMLAssert.*,
				org.assertj.core.api.Assertions.*,
				org.hamcrest.CoreMatchers.*,
				org.hamcrest.Matchers.*,
				org.hamcrest.collection.IsCollectionWithSize.*,
				org.junit.Assert.*,
				org.junit.Assume.*,
				org.mockito.Mockito.*,
				org.mockito.BDDMockito.*,
				org.mockito.AdditionalAnswers.*,
				org.mockito.ArgumentMatchers.*,
				org.mockito.hamcrest.MockitoHamcrest.*,
				org.springframework.integration.gemfire.config.xml.ParserTestUtil.*,
				org.springframework.integration.test.matcher.EqualsResultMatcher.*,
				org.springframework.integration.test.matcher.EventuallyMatcher.*,
				org.springframework.integration.test.matcher.HeaderMatcher.*,
				org.springframework.integration.test.matcher.MapContentMatchers.*,
				org.springframework.integration.test.matcher.MockitoMessageMatchers.*,
				org.springframework.integration.test.matcher.PayloadAndHeaderMatcher.*,
				org.springframework.integration.test.matcher.PayloadMatcher.*,
				org.springframework.integration.test.mock.MockIntegration.*,
				org.springframework.integration.test.util.TestUtils.*,
				org.springframework.test.web.client.match.MockRestRequestMatchers.*,
				org.springframework.test.web.client.response.MockRestResponseCreators.*,
				org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*,
				org.springframework.test.web.servlet.result.MockMvcResultMatchers.*,
				org.springframework.security.test.web.servlet.request.SecurityMockMvcRequestPostProcessors.*,
				org.springframework.security.test.web.servlet.setup.SecurityMockMvcConfigurers.*" />
		</module>
		<module name="IllegalImport" />
		<module name="RedundantImport" />
		<module name="UnusedImports">
			<property name="processJavadoc" value="true" />
		</module>
		<module name="ImportOrder">
			<property name="groups" value="java,/^javax?\./,org,org.springframework,*" />
			<property name="ordered" value="true" />
			<property name="separated" value="true" />
			<property name="option" value="top" />
			<property name="sortStaticImportsAlphabetically" value="true" />
		</module>

		<!-- Javadoc Comments -->
<!-- 		<module name="JavadocType"> -->
<!-- 			<property name="scope" value="package"/> -->
<!-- 			<property name="authorFormat" value=".+\s.+"/> -->
<!-- 		</module> -->
<!-- 		<module name="JavadocMethod"> -->
<!-- 			<property name="allowMissingJavadoc" value="true" /> -->
<!-- 		</module> -->
<!-- 		<module name="JavadocVariable"> -->
<!-- 			<property name="scope" value="public"/> -->
<!-- 		</module> -->
<!-- 		<module name="JavadocStyle"> -->
<!-- 			<property name="checkEmptyJavadoc" value="true"/> -->
<!-- 		</module> -->
<!-- 		<module name="NonEmptyAtclauseDescription" /> -->
<!-- 		<module name="JavadocTagContinuationIndentation"> -->
<!-- 			<property name="offset" value="0"/> -->
<!-- 		</module> -->
<!-- 		<module name="AtclauseOrder"> -->
<!-- 			<property name="target" value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF"/> -->
<!--     		<property name="tagOrder" value="@param, @author, @since, @see, @version, @serial, @deprecated"/> -->
<!-- 		</module> -->
<!--  		<module name="AtclauseOrder"> -->
<!-- 			<property name="target" value="METHOD_DEF, CTOR_DEF, VARIABLE_DEF"/> -->
<!--     		<property name="tagOrder" value="@param, @return, @throws, @since, @deprecated, @see"/> -->
<!-- 		</module> -->

		<!-- Miscellaneous -->
		<module name="CommentsIndentation">
			<property name="tokens" value="BLOCK_COMMENT_BEGIN" />
		</module>
		<module name="UpperEll" />
		<module name="ArrayTypeStyle" />
		<module name="OuterTypeFilename" />

		<!-- Modifiers -->
		<module name="RedundantModifier" />

		<!-- Regexp -->
  		<module name="RegexpSinglelineJava">
 			<property name="format" value="^\t* +\t*\S" />
 			<property name="message"
 				value="Line has leading space characters; indentation should be performed with tabs only." />
 			<property name="ignoreComments" value="true" />
 		</module>
<!--  		<module name="RegexpSinglelineJava"> -->
<!--  			<property name="maximum" value="0"/> -->
<!-- 			<property name="format" value="org\.mockito\.Mockito\.(when|doThrow|doAnswer)" /> -->
<!-- 			<property name="message" -->
<!-- 				value="Please use BDDMockto imports." /> -->
<!-- 			<property name="ignoreComments" value="true" /> -->
<!-- 		</module> -->
<!--  		<module name="RegexpSinglelineJava"> -->
<!--  			<property name="maximum" value="0"/> -->
<!-- 			<property name="format" value="org\.junit\.Assert\.assert" /> -->
<!-- 			<property name="message" -->
<!-- 				value="Please use AssertJ imports." /> -->
<!-- 			<property name="ignoreComments" value="true" /> -->
<!-- 		</module> -->
		<module name="Regexp">
			<property name="format" value="System.(out|err).print" />
			<property name="illegalPattern" value="true" />
			<property name="message" value="System.out or .err" />
		</module>
		<module name="Regexp">
			<property name="format" value="[ \t]+$" />
			<property name="illegalPattern" value="true" />
			<property name="message" value="Trailing whitespace" />
		</module>

		<!-- Whitespace -->
		<module name="GenericWhitespace" />
		<module name="MethodParamPad" />
		<module name="NoWhitespaceAfter" >
			<property name="tokens" value="BNOT, DEC, DOT, INC, LNOT, UNARY_MINUS, UNARY_PLUS, ARRAY_DECLARATOR"/>
		</module>
		<module name="NoWhitespaceBefore" />
		<module name="ParenPad" />
		<module name="TypecastParenPad" />
		<module name="WhitespaceAfter" />
		<module name="WhitespaceAround" />

	</module>
</module>