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Part 2 - Integrate JaCoCo plugin with Sonar and Maven for Code Coverage

What have we learned so far

1. Sonar Server Configuration

JaCoCo Integration with Maven and Sonar for Code Coverage

This post will explain the Steps to integrate JaCoCo plugin with Sonar and Maven for Code Coverage.
With this integration you will be able to see below details on Sonar dashboard:
1. Bugs
2. Vulnerabilities
3. Debt
4. Code Smells
5. Code Coverage
6. Unit tests
7. Duplicate Code Percentage
8. Duplicate Code Block


JaCoCo is a free code coverage library for Java, which has been created by the EclEmma team based on the lessons learned from using and integration existing libraries for many years.
To understand more about JaCoCo  click here

Prerequisite: we should have Sonar server up and running with the token. to know about this you can follow my previous blog:

Once the above steps are completed successfully, follow the below steps to configure JaCoCo with Maven & Sonar
For this process, we will use a project from below git repository: 

clone this git project into your local system and follow below steps:
Step-1 : Add below JaCoCo configuration in the pom.xml file under properties section

Step-2 : Add below JaCoCo plugin in the pom.xml file under Plug In section

Step-3 : Execute below mvn command from project root folder(where pom file exist)

mvn clean org.jacoco:jacoco-maven-plugin:prepare-agent install -Dmaven.test.failure.ignore=false

This command will create JaCoCo reports for us which will contain the code coverage reports at scalable-web-json-comparator\scalable-web\target\coverage-reports\ path.
the code coverage report will be in jacoco-unit.exec file.

Step-4 : Execute below mvn command to push the sonar report to our sonarQube server.

mvn sonar:sonar -Dsonar.jacoco.reportPaths=target/coverage-reports/jacoco-unit.exec
-Dsonar.projectName="scalable-web" -Dsonar.projectKey="scalable-web"
sonar.projectName - Project name
sonar.projectKey - Project key - Sonar host url
sonar.login - Carries the token which was generated in the Sonar, refer previous post to know more.
sonar.jacoco.reportPaths - JaCoCo report to get the code coverage

Step-5 : Once above build is successful, launch Sonar dashboard using the below URL and verify code coverage and unit test case percentage.

With these steps, we have successfully integrated the JaCoCo plugin with Sonar and Maven for Code Coverage.

Let's go to our next tutorial where we will discuss below points :

- What is Eclemma?
- How to find out the code coverage in eclipse?
- EclEmma Configuration in Eclipse


  1. Hello,

    I have a project which has both Scala and Java code. I'm using Jacoco plugin for code coverage.I could see both java and scala test cases in Jacoco report but my sonarQube analysis is only picking up Java code coverage and not Scala code coverage. Could you please guide in how to configure SonarQube for Scala code coverage with Jacoco reports?


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