Make Eclipse default to JUnit4 rather than JUnit5 when the class only contains JUnit4 annotations

Question

A recent upgrade of groovy which brought with it JUnit5 has resulting in Eclipse wanting to run every test under JUnit5. I can sort of work around this by going to run configurations and tell Eclipse to use JUnit4, however this gets tedious.

Is it possible to tell Eclipse to always use JUnit4 for a particular project, including new tests?

Answer 1

You can specify a profile and activate it in Eclipse only.

Example (assuming your problem arose by having a dependency to groovy-all):

    <profiles>
        <profile>
            <id>eclipse-groovy-no-junit5</id>
            <dependencyManagement>
                <dependencies>
                    <dependency>
                        <groupId>${groovy.groupId}</groupId>
                        <artifactId>groovy-all</artifactId>
                        <version>${groovy.version}</version>
                        <type>pom</type>
                        <exclusions>
                            <exclusion>
                                <groupId>${groovy.groupId}</groupId>
                                <artifactId>groovy-test-junit5</artifactId>
                            </exclusion>
                        </exclusions>
                    </dependency>
                </dependencies>
            </dependencyManagement>
        </profile>
    </profiles>

Then go to

Project -> Properties -> Maven -> Active Maven Profiles

and specify the profile name eclipse-groovy-no-junit5.

Remark: groovy.groupId is set to org.codehaus.groovy (it's a variable, because it will be replaced by org.apache.groovy in 4.x) and groovy.version is set to 3.0.8.

If you want to be a bit more verbose, you can add...

    <activation>
        <activeByDefault>false</activeByDefault>
    </activation>

...but it's the default anyway.