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">
  <!--module name="NewlineAtEndOfFile"/-->
  <module name="FileLength"/>
  <module name="FileTabCharacter"/>
  <property name="cacheFile" value="${checkstyle.cache.file}"/>
  <!-- Trailing spaces -->
  <module name="RegexpSingleline">
    <property name="format" value="\s+$"/>
    <property name="message" value="Line has trailing spaces."/>
  </module>

  <module name="LineLength">
    <property name="max" value="100"/>
  </module>

  <!-- Disable checkstyle for to long lines of code -->
  <module name="SuppressWithPlainTextCommentFilter">
    <property name="offCommentFormat" value="BEGIN TO LONG CODE LINES"/>
    <property name="onCommentFormat" value="END TO LONG CODE LINES"/>
    <property name="checkFormat" value="LineLengthCheck"/>
  </module>

  <!-- Space after 'for' and 'if' -->
  <module name="RegexpSingleline">
    <property name="format" value="^\s*(for|if)\("/>
    <property name="message" value="Space needed before opening parenthesis of loop/branch statement."/>
  </module>

  <!-- For each spacing -->
  <module name="RegexpSingleline">
    <property name="format" value="^\s*for \(.*?([^ ]:|:[^ ])"/>
    <property name="message" value="Space needed around ':' character."/>
  </module>

  <module name="TreeWalker">

    <module name="ConstantName">
      <!-- Add special treatment for query parameter matching, for readability -->
      <property
          name="format"
          value="^((Is|Has|Match|Exist)[_A-Za-z0-9]+)|([A-Z][A-Z0-9]*(_[A-Z0-9]+)*)$"
      />
    </module>
    <module name="LocalFinalVariableName"/>
    <module name="LocalVariableName"/>
    <module name="MemberName"/>
    <module name="MethodName"/>
    <module name="PackageName"/>
    <module name="ParameterName"/>
    <module name="StaticVariableName"/>
    <module name="TypeName"/>


    <!-- Checks for imports                              -->
    <!-- See http://checkstyle.sf.net/config_import.html -->
    <module name="AvoidStarImport"/>
    <module name="IllegalImport"/>
    <module name="RedundantImport"/>
    <module name="UnusedImports">
      <property name="processJavadoc" value="true"/>
    </module>


    <!-- Checks for Size Violations.                    -->
    <!-- See http://checkstyle.sf.net/config_sizes.html -->

    <module name="ParameterNumber"/>


    <!-- Checks for whitespace                               -->
    <!-- See http://checkstyle.sf.net/config_whitespace.html -->
    <module name="GenericWhitespace"/>
    <module name="EmptyForIteratorPad"/>
    <module name="MethodParamPad"/>
    <module name="NoWhitespaceAfter"/>
    <module name="NoWhitespaceBefore"/>
    <module name="OperatorWrap"/>
    <module name="ParenPad"/>
    <module name="TypecastParenPad"/>
    <module name="WhitespaceAfter"/>
    <module name="WhitespaceAround"/>


    <!-- Modifier Checks                                    -->
    <!-- See http://checkstyle.sf.net/config_modifiers.html -->
    <module name="ModifierOrder" />
    <module name="RedundantModifier"/>


    <!-- Checks for blocks. You know, those {}'s         -->
    <!-- See http://checkstyle.sf.net/config_blocks.html -->
    <module name="AvoidNestedBlocks"/>
    <module name="LeftCurly"/>
    <module name="NeedBraces">
        <property name="tokens" value="LITERAL_DO, LITERAL_ELSE, LITERAL_FOR, LITERAL_WHILE"/>
    </module>
    <module name="RightCurly"/>


    <!-- Checks for common coding problems               -->
    <!-- See http://checkstyle.sf.net/config_coding.html -->
    <module name="CovariantEquals"/>
    <module name="EmptyStatement"/>
    <module name="EqualsAvoidNull"/>
    <module name="EqualsHashCode"/>
    <module name="IllegalInstantiation"/>
    <module name="InnerAssignment"/>
    <module name="MagicNumber">
     <property name="ignoreNumbers" value="-1,0,1,2,10,100,255,16777215"/>
    </module>
    <module name="MissingSwitchDefault"/>
    <module name="SimplifyBooleanExpression"/>
    <module name="SimplifyBooleanReturn"/>


    <!-- Checks for class design                         -->
    <!-- See http://checkstyle.sf.net/config_design.html -->
    <module name="InterfaceIsType"/>


    <!-- Miscellaneous other checks.                   -->
    <!-- See http://checkstyle.sf.net/config_misc.html -->
    <module name="ArrayTypeStyle"/>
    <module name="TodoComment"/>
    <module name="UpperEll"/>

  </module>
</module>