Скачать или смотреть How to Fix 0% Coverage in JaCoCo Reports with Maven

Discover solutions to the common problem of `0% coverage` in JaCoCo Plugin reports when using Maven. Learn how to configure your pom.xml properly for accurate test coverage metrics.
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Solving the 0% Coverage Issue in JaCoCo Reports with Maven

If you're working with Maven and JaCoCo for test coverage, you might have encountered an issue where JaCoCo reports consistently show 0% coverage. While IntelliJ may show accurate results, the reports generated by JaCoCo don't reflect your tests' true performance. This guide will help you understand this problem and provide you with a detailed solution.

Understanding JaCoCo and Maven

What is JaCoCo?

JaCoCo (Java Code Coverage) is a popular tool used for measuring test coverage in Java applications. It helps developers understand how much of their code is being tested and allows for better test quality assurance.

Why Maven?

Maven is a widely-used build automation tool in Java projects, and it simplifies the process of managing project dependencies, building artifacts, and running tests. Integrating JaCoCo with Maven will help you generate coverage reports automatically as part of your build process.

The Core Problem: 0% Coverage Report

The issue where JaCoCo reports show 0% coverage can stem from various configuration problems in your Maven pom.xml file. Below is a common setup that might lead to the issue.

Sample Configuration Snippet

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Steps to Fix the Issue

1. Add the report Goal

One important step that may have been overlooked is the inclusion of the report goal in the JaCoCo plugin configuration. This goal is essential because it generates the actual code coverage report after the tests have been executed. Here’s how to integrate it:

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2. Review Execution Sequence

Ensure that the JaCoCo plugin is configured to run after the tests have been executed. Adjusting the order of your plugin executions can greatly impact the accuracy of your reports. Here’s a simplified order:

Run Tests: maven-surefire-plugin

Generate Report: jacoco-maven-plugin

3. Ensure Correct Test Configuration

Double-check that your tests do indeed run and are defined correctly to ensure that there’s code to be covered. Sometimes coverage issues may stem from test failures that do not execute the code.

Conclusion

By adding the report goal to your jacoco-maven-plugin configuration and ensuring the correct execution order, you should be able to rectify the 0% coverage issue in your JaCoCo reports. Always review your build and testing setup to make sure they are aligned for accurate reporting.

Implement these changes and see if your JaCoCo reports start reflecting your test coverage accurately. Happy testing!