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Code coverage (JaCoCo)

Code coverage with JaCoCo – offline weaving, coverage profile and report generation.

HOW-TO DEVELOPER STAND: JUL 2026 GILT FUER NUCLOS 4.2026.X

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Code coverage of the Nuclos build and the integration tests is measured with JaCoCo (from v4.2024.13).

Process

Offline weaving via the jacoco-maven-plugin after javac but before the AspectJ bytecode manipulation (runtime online weaving did not work for Nuclos due to AspectJ/Spring weaving).
Include the JaCoCo runtime as a dependency in all Maven modules.
Unit and integration tests write all coverage data to $NUCLOS_GIT_ROOT/target/jacoco.exec.

Activation via the Maven profile coverage, e.g. for the Tomcat server integration tests:

mvn clean verify -Dlocale=de_DE -Dtest.webclient.skip=true -P coverage,test,test-tomcat

Create a report per module:

mvn jacoco:report@coverage-report

Sonar integration

The Sonar code analysis automatically uses the JaCoCo reports if present.

Sonar.

Unit tests.