Adding scala style to your project

Maven plugin configuration

            <plugin>
                <groupId>org.scalastyle</groupId>
                <artifactId>scalastyle-maven-plugin</artifactId>
                <version>0.4.0</version>
                <configuration>
                    <verbose>false</verbose>
                    <failOnViolation>true</failOnViolation>
                    <includeTestSourceDirectory>true</includeTestSourceDirectory>
                    <failOnWarning>false</failOnWarning>
                    <sourceDirectory>${basedir}/src/main/scala</sourceDirectory>
                    <testSourceDirectory>${basedir}/src/test/scala</testSourceDirectory>
                    <configLocation>${basedir}/build/scalastyle_config.xml</configLocation>
                    <outputFile>${project.basedir}/target/scalastyle-output.xml</outputFile>
                    <outputEncoding>UTF-8</outputEncoding>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>check</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

scalastyle_config.xml

<scalastyle commentFilter="enabled">
 <name>Scalastyle standard configuration</name>
 <check level="warning" class="org.scalastyle.file.FileTabChecker" enabled="true"></check>
 <check level="error" class="org.scalastyle.file.FileLengthChecker" enabled="true">
  <parameters>
   <parameter name="maxFileLength"><![CDATA[800]]></parameter>
  </parameters>
 </check>
 <check level="warning" class="org.scalastyle.file.HeaderMatchesChecker" enabled="false">
  <parameters>
   <parameter name="header"></parameter>
  </parameters>
 </check>
 <check level="warning" class="org.scalastyle.scalariform.SpacesAfterPlusChecker" enabled="true"></check>
 <check level="warning" class="org.scalastyle.file.WhitespaceEndOfLineChecker" enabled="true"></check>
 <check level="warning" class="org.scalastyle.scalariform.SpacesBeforePlusChecker" enabled="true"></check>
 <check level="error" class="org.scalastyle.file.FileLineLengthChecker" enabled="true">
  <parameters>
   <parameter name="maxLineLength"><![CDATA[160]]></parameter>
   <parameter name="tabSize"><![CDATA[4]]></parameter>
  </parameters>
 </check>
 <check level="error" class="org.scalastyle.scalariform.ClassNamesChecker" enabled="true">
  <parameters>
   <parameter name="regex"><![CDATA[[A-Z][A-Za-z]*]]></parameter>
  </parameters>
 </check>
 <check level="error" class="org.scalastyle.scalariform.ObjectNamesChecker" enabled="true">
  <parameters>
   <parameter name="regex"><![CDATA[[A-Z][A-Za-z]*]]></parameter>
  </parameters>
 </check>
 <check level="error" class="org.scalastyle.scalariform.PackageObjectNamesChecker" enabled="true">
  <parameters>
   <parameter name="regex"><![CDATA[^[a-z][A-Za-z]*$]]></parameter>
  </parameters>
 </check>
 <check level="error" class="org.scalastyle.scalariform.EqualsHashCodeChecker" enabled="true"></check>
 <check level="warning" class="org.scalastyle.scalariform.IllegalImportsChecker" enabled="true">
  <parameters>
   <parameter name="illegalImports"><![CDATA[sun._,java.awt._]]></parameter>
  </parameters>
 </check>
 <check level="error" class="org.scalastyle.scalariform.ParameterNumberChecker" enabled="true">
  <parameters>
   <parameter name="maxParameters"><![CDATA[8]]></parameter>
  </parameters>
 </check>
 <check level="warning" class="org.scalastyle.scalariform.MagicNumberChecker" enabled="false">
  <parameters>
   <parameter name="ignore"><![CDATA[-1,0,1,2,3]]></parameter>
  </parameters>
 </check>
 <check level="warning" class="org.scalastyle.scalariform.NoWhitespaceBeforeLeftBracketChecker" enabled="true"></check>
 <check level="warning" class="org.scalastyle.scalariform.NoWhitespaceAfterLeftBracketChecker" enabled="true"></check>
 <check level="warning" class="org.scalastyle.scalariform.ReturnChecker" enabled="false"></check>
 <check level="error" class="org.scalastyle.scalariform.NullChecker" enabled="true"></check>
 <check level="error" class="org.scalastyle.scalariform.NoCloneChecker" enabled="true"></check>
 <check level="error" class="org.scalastyle.scalariform.NoFinalizeChecker" enabled="true"></check>
 <check level="warning" class="org.scalastyle.scalariform.CovariantEqualsChecker" enabled="true"></check>
 <check level="warning" class="org.scalastyle.scalariform.StructuralTypeChecker" enabled="true"></check>
 <check level="warning" class="org.scalastyle.file.RegexChecker" enabled="true">
  <parameters>
   <parameter name="regex"><![CDATA[println]]></parameter>
  </parameters>
 </check>
 <check level="warning" class="org.scalastyle.scalariform.NumberOfTypesChecker" enabled="true">
  <parameters>
   <parameter name="maxTypes"><![CDATA[30]]></parameter>
  </parameters>
 </check>
 <check level="warning" class="org.scalastyle.scalariform.CyclomaticComplexityChecker" enabled="true">
  <parameters>
   <parameter name="maximum"><![CDATA[10]]></parameter>
  </parameters>
 </check>
 <check level="error" class="org.scalastyle.scalariform.UppercaseLChecker" enabled="true"></check>
 <check level="warning" class="org.scalastyle.scalariform.SimplifyBooleanExpressionChecker" enabled="true"></check>
 <check level="error" class="org.scalastyle.scalariform.IfBraceChecker" enabled="false">
  <parameters>
   <parameter name="singleLineAllowed"><![CDATA[true]]></parameter>
   <parameter name="doubleLineAllowed"><![CDATA[false]]></parameter>
  </parameters>
 </check>
 <check level="error" class="org.scalastyle.scalariform.MethodLengthChecker" enabled="true">
  <parameters>
   <parameter name="maxLength"><![CDATA[30]]></parameter>
  </parameters>
 </check>
 <check level="warning" class="org.scalastyle.scalariform.MethodNamesChecker" enabled="true">
  <parameters>
   <parameter name="regex"><![CDATA[^[a-z][A-Za-z0-9]*$]]></parameter>
  </parameters>
 </check>
 <check level="error" class="org.scalastyle.scalariform.NumberOfMethodsInTypeChecker" enabled="true">
  <parameters>
   <parameter name="maxMethods"><![CDATA[30]]></parameter>
  </parameters>
 </check>
 <check level="error" class="org.scalastyle.scalariform.PublicMethodsHaveTypeChecker" enabled="true"></check>
 <check level="warning" class="org.scalastyle.file.NewLineAtEofChecker" enabled="false"></check>
 <check level="warning" class="org.scalastyle.file.NoNewLineAtEofChecker" enabled="false"></check>
 <check level="warning" class="org.scalastyle.scalariform.WhileChecker" enabled="false"></check>
 <check level="warning" class="org.scalastyle.scalariform.VarFieldChecker" enabled="false"></check>
 <check level="warning" class="org.scalastyle.scalariform.VarLocalChecker" enabled="false"></check>
 <check level="warning" class="org.scalastyle.scalariform.RedundantIfChecker" enabled="false"></check>
 <check level="warning" class="org.scalastyle.scalariform.TokenChecker" enabled="false">
  <parameters>
   <parameter name="regex"><![CDATA[println]]></parameter>
  </parameters>
 </check>
 <check level="warning" class="org.scalastyle.scalariform.DeprecatedJavaChecker" enabled="true"></check>
 <check level="warning" class="org.scalastyle.scalariform.EmptyClassChecker" enabled="true"></check>
 <check level="warning" class="org.scalastyle.scalariform.ClassTypeParameterChecker" enabled="true">
  <parameters>
   <parameter name="regex"><![CDATA[^[A-Z_]$]]></parameter>
  </parameters>
 </check>
 <check level="warning" class="org.scalastyle.scalariform.UnderscoreImportChecker" enabled="false"></check>
 <check level="warning" class="org.scalastyle.scalariform.LowercasePatternMatchChecker" enabled="false"></check>
 <check level="warning" class="org.scalastyle.scalariform.MultipleStringLiteralsChecker" enabled="false">
  <parameters>
   <parameter name="allowed"><![CDATA[2]]></parameter>
   <parameter name="ignoreRegex"><![CDATA[^""$]]></parameter>
  </parameters>
 </check>
 <check level="error" class="org.scalastyle.scalariform.ImportGroupingChecker" enabled="true"></check>
 <check level="error" class="org.scalastyle.scalariform.ProcedureDeclarationChecker" enabled="true"/>
 <check level="error" class="org.scalastyle.scalariform.ForBraceChecker" enabled="false"/>

</scalastyle>

1. create a directory called build at the same level as src and put the scala style config file there.
2. add the maven plugin configuration to pom.xml