checkstyle.xml

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

<module name="Checker">
	<property name="localeLanguage" value="en" />
	<module name="NewlineAtEndOfFile">
		<property name="lineSeparator" value="lf" />
	</module>
	<module name="FileTabCharacter">
		<property name="fileExtensions" value="java,xml" />
	</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="SuppressionFilter">
		<property name="file" value="checkstyle-suppressions.xml" />
	</module>
	<module name="TreeWalker">
		<module name="AvoidStarImport" />
		<module name="IllegalImport" />
		<module name="RedundantImport" />
		<module name="UnusedImports" />
		<module name="NeedBraces" />
		<module name="JavadocMethod">
			<property name="allowUndeclaredRTE" value="true" />
			<property name="scope" value="public" />
		</module>
		<module name="ModifierOrder" />
		<module name="RedundantModifier" />
		<module name="UpperEll" />
		<module name="LeftCurly" />
		<module name="NeedBraces" />
		<module name="RightCurly" />
		<module name="GenericWhitespace" />
		<module name="WhitespaceAfter" />
		<module name="NoWhitespaceBefore" />
	</module>
</module>