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Code Quality Stage Using Jenkins

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Code Quality Stage Using Jenkins

· DevOps Zone
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In Continuous Delivery each build is potentially shippable. This fact implies among a lot of other things, to assign a none snapshot version to your components as fast as possible so you can refer them through all the process.

Usually automated software delivery process consist of several stages like  Commit stage, Code Quality, Acceptance Tests, Manual Test, Deployment, ... But let's focusing on second stage related to code quality. Note that in my previous post ( http://www.lordofthejars.com/2013/02/conditional-buildstep-jenkins-plugin.html) there are some concepts that are being used here.

Second stage in  continuous delivery is the code quality. This step is very important because is where we are running static code analysis for detecting possible defects (mostly possible  NPE), code conventions or unnecessary object creation. Some of projects that are typically used are  CheckstylePMD or  FindBugs among others. In this case we are going to see how to use  Checkstyle, but of course it is very similar in any other tool.

So the first thing to do is configure  Checkstyle into our build tool (in this case  Maven). Because we only want to run the static analysis in second stage of our pipeline we are going to register the  Checkstyle Maven plugin into a  metrics profile. Keep in mind that all plugins run for code analysis should be added into that profile.
<profiles>
  <profile>
    <id>metrics</id>
    <build>
      <plugins>
      <!--  CHECKSTYLE  -->
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-checkstyle-plugin</artifactId>
          <version>2.9.1</version>
        </plugin>
      </plugins>
    </build>
  </profile>
</profiles>
Now that we have our  pom configured with  Checkstyle, we can configure  Jenkins to run  Code Quality stage after the first stage (explained in my  previous post).

In this case we are going to use  Trigger Parameterized Build plugin to execute code quality job from commit stage.

Because code of current build version has been pushed into a release branch (see my previous post) during commit stage, we need to set branch name as parameter for the code quality  Jenkins job, so code can be downloaded and then run the static analysis.

In build job of our first stage, we add a  Post-build Action of type  Trigger parameterized build on other projects. First we open the  Configure menu of first build job of pipeline and we configure it so next build job of the pipeline ( helloworld-code-quality) is executed only if current job is stable. Also we define the RELEASE_BRANCH_NAME parameter with branch name.



Then let's create a new build job that will be in charge of running static code analysis, we are going to name it  helloworld-code-quality.

And we configure the new build job. First of all check the option " This build is parameterized", and add a  String parameter and set the name RELEASE_BRANCH_NAME. After that we can use  RELEASE_BRANCH_NAME parameter in current job. So at  Source Code Management section we add the repository  URL and in  Branches to build we set  origin/${RELEASE_BRANCH_NAME}.

Then at  Build section we add a  Maven build step, which executes  Checkstyle goal: checkstyle:checkstyle -P metrics.

And finally to have a better visibility of the result, we can install  Checkstyle Jenkins plugin and publish the report. After plugin is installed, we can add a new  Post-build Actions with name " Publish Checkstyle analysis result". In our case report is located at **/target/checkstyle-result.xml.



And that's all for current stage, next stage is the responsible of executing the acceptance tests, but this would be in another post.

So in summary we have learned how after code is compiled and some tests are executed (in first stage of pipeline), the Code Quality stage is run into  Jenkins using Checkstyle Maven plugin.

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