Scala style checkeck (Maven project)

pom.xml

<project>
    <build>
        <plugins>
            <plugin>
                <groupId>org.scalastyle</groupId>
                <artifactId>scalastyle-maven-plugin</artifactId>
                <version>0.8.0</version>
                <configuration>
                    <verbose>false</verbose>
                    <failOnViolation>true</failOnViolation>
                    <failOnWarning>false</failOnWarning>
                    <includeTestSourceDirectory>true</includeTestSourceDirectory>
                    <sourceDirectory>${basedir}/src/main/scala</sourceDirectory>
                    <testSourceDirectories>
                        <dir>${basedir}/src/test/scala</dir>
                        <dir>${basedir}/src/it/scala</dir>
                    </testSourceDirectories>
                    <configLocation>${basedir}/scalastyle_config.xml</configLocation>
                    <!--<outputFile>${project.basedir}/scalastyle-output.xml</outputFile>-->
                    <outputEncoding>UTF-8</outputEncoding>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>check</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

scalastyle_config.xml

<scalastyle commentFilter="enabled">
    <name>Scalastyle standard configuration</name>
    <check level="error" class="org.scalastyle.file.FileTabChecker" enabled="true"/>
    <check level="warning" 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="true">
        <parameters>
            <parameter name="header"><![CDATA[// Copyright (C) 2011-2012 the original author or authors.
// See the LICENCE.txt file distributed with this work for additional
// information regarding copyright ownership.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.]]></parameter>
        </parameters>
    </check>
    <check level="error" class="org.scalastyle.scalariform.SpacesAfterPlusChecker" enabled="true"/>
    <check level="error" class="org.scalastyle.file.WhitespaceEndOfLineChecker" enabled="true"/>
    <check level="error" class="org.scalastyle.scalariform.SpacesBeforePlusChecker" enabled="true"/>
    <check level="error" class="org.scalastyle.file.FileLineLengthChecker" enabled="true">
        <parameters>
            <parameter name="maxLineLength"><![CDATA[120]]></parameter>
            <parameter name="tabSize"><![CDATA[4]]></parameter>
        </parameters>
    </check>
    <check level="warning" class="org.scalastyle.scalariform.ClassNamesChecker" enabled="true">
        <parameters>
            <parameter name="regex"><![CDATA[[A-Z][A-Za-z]*]]></parameter>
        </parameters>
    </check>
    <check level="warning" class="org.scalastyle.scalariform.ObjectNamesChecker" enabled="true">
        <parameters>
            <parameter name="regex"><![CDATA[[A-Z][A-Za-z]*]]></parameter>
        </parameters>
    </check>
    <check level="warning" class="org.scalastyle.scalariform.PackageObjectNamesChecker" enabled="true">
        <parameters>
            <parameter name="regex"><![CDATA[^[a-z][A-Za-z]*$]]></parameter>
        </parameters>
    </check>
    <check level="warning" class="org.scalastyle.scalariform.EqualsHashCodeChecker" enabled="true"/>
    <check level="warning" class="org.scalastyle.scalariform.IllegalImportsChecker" enabled="true">
        <parameters>
            <parameter name="illegalImports"><![CDATA[sun._,java.awt._]]></parameter>
        </parameters>
    </check>
    <check level="warning" 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="true">
        <parameters>
            <parameter name="ignore"><![CDATA[-1,0,1,2,3]]></parameter>
        </parameters>
    </check>
    <check level="error" class="org.scalastyle.scalariform.NoWhitespaceBeforeLeftBracketChecker" enabled="true"/>
    <check level="error" class="org.scalastyle.scalariform.NoWhitespaceAfterLeftBracketChecker" enabled="true"/>
    <check level="warning" class="org.scalastyle.scalariform.ReturnChecker" enabled="true"/>
    <check level="warning" class="org.scalastyle.scalariform.NullChecker" enabled="true"/>
    <check level="warning" class="org.scalastyle.scalariform.NoCloneChecker" enabled="true"/>
    <check level="warning" class="org.scalastyle.scalariform.NoFinalizeChecker" enabled="true"/>
    <check level="warning" class="org.scalastyle.scalariform.CovariantEqualsChecker" enabled="true"/>
    <check level="warning" class="org.scalastyle.scalariform.StructuralTypeChecker" enabled="true"/>
    <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 level="warning" class="org.scalastyle.scalariform.SimplifyBooleanExpressionChecker" enabled="true"/>
    <check level="error" class="org.scalastyle.scalariform.IfBraceChecker" enabled="true">
        <parameters>
            <parameter name="singleLineAllowed"><![CDATA[true]]></parameter>
            <parameter name="doubleLineAllowed"><![CDATA[false]]></parameter>
        </parameters>
    </check>
    <check level="warning" class="org.scalastyle.scalariform.MethodLengthChecker" enabled="true">
        <parameters>
            <parameter name="maxLength"><![CDATA[50]]></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="warning" class="org.scalastyle.scalariform.NumberOfMethodsInTypeChecker" enabled="true">
        <parameters>
            <parameter name="maxMethods"><![CDATA[30]]></parameter>
        </parameters>
    </check>
    <check level="warning" class="org.scalastyle.scalariform.PublicMethodsHaveTypeChecker" enabled="true"/>
    <check level="error" class="org.scalastyle.file.NewLineAtEofChecker" enabled="true"/>
    <check level="warning" class="org.scalastyle.file.NoNewLineAtEofChecker" enabled="false"/>
    <check level="warning" class="org.scalastyle.scalariform.WhileChecker" enabled="true"/>
    <check level="warning" class="org.scalastyle.scalariform.VarFieldChecker" enabled="true"/>
    <check level="warning" class="org.scalastyle.scalariform.VarLocalChecker" enabled="true"/>
    <check level="warning" class="org.scalastyle.scalariform.RedundantIfChecker" enabled="true"/>
    <check level="warning" class="org.scalastyle.scalariform.TokenChecker" enabled="true">
        <parameters>
            <parameter name="regex"><![CDATA[println]]></parameter>
        </parameters>
    </check>
    <check level="error" class="org.scalastyle.scalariform.DeprecatedJavaChecker" enabled="true"/>
    <check level="warning" class="org.scalastyle.scalariform.EmptyClassChecker" enabled="true"/>
    <check level="warning" class="org.scalastyle.scalariform.ClassTypeParameterChecker" enabled="true">
        <parameters>
            <parameter name="regex"><![CDATA[^[A-Z_]$]]></parameter>
        </parameters>
    </check>
    <check level="warning" class="org.scalastyle.scalariform.UnderscoreImportChecker" enabled="true"/>
    <check level="warning" class="org.scalastyle.scalariform.LowercasePatternMatchChecker" enabled="true"/>
    <check level="warning" class="org.scalastyle.scalariform.MultipleStringLiteralsChecker" enabled="true">
        <parameters>
            <parameter name="allowed"><![CDATA[2]]></parameter>
            <parameter name="ignoreRegex"><![CDATA[^""$]]></parameter>
        </parameters>
    </check>
    <check level="error" class="org.scalastyle.scalariform.ImportGroupingChecker" enabled="true"/>
</scalastyle>