checkstyle.xml

<?xml version="1.0"?>
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<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
        "http://www.puppycrawl.com/dtds/configuration_1_3.dtd">
<module name="Checker">
	<module name="TreeWalker">
		<module name="LeftCurly">
			<property name="option" value="nl"/>
		</module>
		<module name="RightCurly">
			<property name="option" value="alone"/>
		</module>
		<!-- require tabs for indenting - https://stackoverflow.com/a/28550141 -->
		<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="WhitespaceAround"/>
		<module name="UnusedImports"/>
	</module>
	<module name="RegexpMultiline">
		<property name="format" value="else[ \t]*[\r\n]+[ \t]*if"/>
		<property name="message" value="Newline should not be between else and if"/>
	</module>
</module>