checkstyle.xml

<?xml version="1.0"?>
<!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="Header">
        <property name="header" value=""/>
    </module>

    <module name="TreeWalker">

        <module name="UnusedImports"/>

        <module name="RedundantImport"/>

        <module name="AvoidStarImport"/>

        <module name="IllegalImport"/>

        <module name="ImportOrder">
            <property name="groups" value="java,javax,javafx,org.jabref,*"/>
            <property name="ordered" value="true"/>
            <property name="separated" value="true"/>
            <property name="option" value="bottom"/>
            <property name="sortStaticImportsAlphabetically" value="true"/>
        </module>

        <module name="EmptyLineSeparator">
            <property name="tokens"
                      value="IMPORT, CLASS_DEF, INTERFACE_DEF, ENUM_DEF, STATIC_INIT, INSTANCE_INIT, METHOD_DEF"/>
            <property name="allowMultipleEmptyLines" value="false"/>
            <property name="allowMultipleEmptyLinesInsideClassMembers" value="false"/>
        </module>

        <module name="DeclarationOrder"/>

        <!-- RCULRY causes issues if classes are nested within arrays, therefore not activated -->
        <module name="WhitespaceAround">
            <property name="tokens"
                      value="ASSIGN, BAND, BAND_ASSIGN, BOR, BOR_ASSIGN, BSR, BSR_ASSIGN, BXOR, BXOR_ASSIGN, COLON, DIV,
                      DIV_ASSIGN, DO_WHILE, EQUAL, GE, GT, LAND, LCURLY, LE, LITERAL_CATCH, LITERAL_DO, LITERAL_ELSE,
                      LITERAL_FINALLY, LITERAL_FOR, LITERAL_IF, LITERAL_RETURN, LITERAL_SWITCH, LITERAL_SYNCHRONIZED,
                      LITERAL_TRY, LITERAL_WHILE, LOR, LT, MINUS, MINUS_ASSIGN, MOD, MOD_ASSIGN, NOT_EQUAL,
                      PLUS, PLUS_ASSIGN, QUESTION,
                      SL, SLIST, SL_ASSIGN, SR, SR_ASSIGN, STAR, STAR_ASSIGN, LITERAL_ASSERT, TYPE_EXTENSION_AND"/>
        </module>

        <module name="ConstantName">
            <property name="format" value="^log(ger)?|[A-Z][A-Z0-9]*(_[A-Z0-9]+)*$"/>
        </module>
    </module>

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