Log4J2 shows warning about degraded performance when running on Java 11

[tobous]

When running Saros on a Java 11 runtime environment, the following warning is displayed in the log:

WARNING: sun.reflect.Reflection.getCallerClass is not supported. This will impact performance.

This problem is described in the following StackOverflow entry: https://stackoverflow.com/questions/53049346/is-log4j2-compatible-with-java-11

[m273d15]

Have you tried the suggested fix: Adding Multi-Release: true to the MANIFEST.MF?

[tobous]

Have you tried the suggested fix: Adding Multi-Release: true to the MANIFEST.MF?

I added it to the manifest section of the IntelliJ jar build, but it did not change anything.

            attributes(mutableMapOf(
                    "Created-By" to "IntelliJ IDEA",
                    "Manifest-Version" to "1.0",
                    "Multi-Release" to "true"

But I only tested it with the runIDE task. I don't know whether it actually uses the built jar or some other, internal mechanism to deploy the plugin.