How to enable/install the "compatibility layer" in Maven Tycho Surefire so that Platform.getPlugin() works

Question

I have a test failure due to an IllegalStateException from Platform.getPlugin("...") which calls @Deprecated org.eclipse.core.runtime.Platform.getPluginRegistry() which "only works if the compatibility layer is installed and must not be used otherwise."

This test works in-workspace during development, but fails (reproducible) when ran by Maven Tycho Surefire. I gathered that this has something to do with org.eclipse.core.runtime.compatibility, so have attempted to do this in the pom.xml:

<plugin>
    <groupId>org.eclipse.tycho</groupId>
    <artifactId>tycho-surefire-plugin</artifactId>
    <version>${tycho-version}</version>
    <configuration>
        ...     
        <dependencies>
            <dependency>
                <type>p2-installable-unit</type>
                <artifactId>org.eclipse.core.runtime.compatibility</artifactId>
            </dependency>
        </dependencies>
        <bundleStartLevel>
            <bundle>
                <id>org.eclipse.core.runtime.compatibility</id>
                <level>4</level>
                <autoStart>true</autoStart>
            </bundle>
        </bundleStartLevel>
    </configuration>

Unfortunately even with this (above) it still does not work - what am I doing wrong?

As an alternative Answer to fix this, I guess I could try to adapt that line in the test to use another API than this deprecated Platform.getPlugin() - but how do you obtain an org.eclipse.core.runtime.Plugin given an ID without using any deprecated APIs requiring this compatibility layer which is causing me issues here?

Answer 1

Actually simply Platform.getBundle() instead of Platform.getPlugin() did the trick.

Also, just in case anyone else ever hits this, the extra dependency configuration does work - it just lead to ANOTHER unrelated IllegalStateException in my specific test case, which caused me confusion.