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Integrate Checkstyle plugin with maven build

Checkstyle will make java code more readable & maintainable. 
          
checkstyle-maven plugin configuration:
  
      <build>
        <plugins>     
          ..................
          <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-checkstyle-plugin</artifactId>
                <version>2.5</version>
                <inherited>true</inherited>
                <configuration>
                    <!--to skip checkstyle validation set value as "true" -->
                    <skip>false</skip>
                    <consoleOutput>true</consoleOutput>
                    <logViolationsToConsole>true</logViolationsToConsole>
                    <!--want to make build fail, when checkstyle found validation error. set value as "true".-->
                    <failOnViolation>true</failOnViolation>
                    <violationSeverity>warning</violationSeverity>
  <!-- sun_checks.xml is default checkstyle configuration from checkstyle. Can add/remove validations in this file.  -->                    <configLocation>${basedir}/src/main/resources/sun_checks.xml</configLocation>

                </configuration>
<!-- the below configuration will ask maven build to execute checkstyle goal -->
                <executions>
                    <execution>
                        <goals>
                            <goal>check</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

       </plugins>
</build>


With above configuration build will fail if checkstyle found validation error.


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