Classes are not unloaded after BCV tasks

[osipxd]

After running BCV tasks, Gradle doesn’t free up metaspace memory.
For example, in the Ktor project, each run of apiDump uses up to 4GB of metaspace memory (#281). The only way to free up this memory is to restart Gradle Daemon.

Here is an example of four consecutive launches of ./gradlew apiDump --rerun-tasks in the Ktor project.

It is a known Gradle bug:

• 'java.lang.OutOfMemoryError: Metaspace' when using the Worker API with classloader isolation  gradle/gradle#18313

Steps to reproduce

1. Clone Ktor repository

   git clone [email protected]:ktorio/ktor.git

2. Run VisualVM or any other VM monitoring tool
3. Run ./gradlew apiDump --rerun-tasks several times
4. Look at metaspace usage by Gradle Daemon process in VisualVM

Possible workaround

Some projects use processIsolation instead of classLoaderIsolation (cortinico/ktfmt-gradle#206, sigstore/sigstore-java#283). Could this solution be used for BCV?