checkstyle.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE module PUBLIC
          "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
          "http://www.puppycrawl.com/dtds/configuration_1_3.dtd">
<module name="Checker">
	<property name="localeLanguage" value="en" />

	<!-- Checks whether files end with a new line. -->
	<!-- See http://checkstyle.sf.net/config_misc.html#NewlineAtEndOfFile -->
	<module name="NewlineAtEndOfFile" />

	

	<!-- Checks for white space at the end of the line -->
	<!-- See http://checkstyle.sourceforge.net/config_regexp.html -->
	<module name="RegexpSingleline">
		<property name="format" value="\s+$" />
		<property name="message" value="Line has trailing spaces." />
		<property name="fileExtensions" value="java" />
	</module>


	<module name="TreeWalker">
		<property name="cacheFile" value="target/cachefile" />
		<property name="tabWidth " value="4"/>
		<module name="OperatorWrap">
			<property name="option" value="nl" />
		</module>
		<module name="LineLength">
			<property name="max" value="200" />
		</module>
	</module>

</module>