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="FileTabCharacter">
		<property name="eachLine" value="true" />
	</module>

	<module name="RegexpSingleline">

		<!-- \s matches whitespace character, $ matches end of line. -->

		<property name="format" value="\s+$" />
		<property name="message" value="Line has trailing spaces." />
	</module>

	<module name="TreeWalker">

		<property name="cacheFile" value="${checkstyle.cache.file}" />

		<!-- Checks for imports                              -->

		<module name="AvoidStarImport" />
		<module name="RedundantImport" />

		<!-- Disabled until checkstyle can recognize imports which are used only by javadoc -->

		<!--<module name="UnusedImports"/>-->

		<!-- Modifier Checks                                    -->

		<module name="ModifierOrder" />
		<module name="RedundantModifier" />

		<!-- Checks for blocks. You know, those {}'s         -->

		<module name="LeftCurly" />

		<!-- Checks for common coding problems               -->

		<!-- Disabled until http://sourceforge.net/tracker/?func=detail&aid=2843447&group_id=29721&atid=397078 is fixed-->
		<!--<module name="DoubleCheckedLocking"/>-->
		<module name="EmptyStatement" />
		<module name="EqualsHashCode" />
		<module name="IllegalInstantiation" />
		<module name="RedundantThrows">
			<property name="allowUnchecked" value="true" />
		</module>

		<!-- Miscellaneous other checks.                   -->

		<module name="UpperEll" />
		<module name="PackageAnnotation" />
		<module name="CovariantEquals" />
		<module name="ArrayTypeStyle" />

	</module>

</module>