High metaspace usage on a large muti-module project

[osipxd]

I observe high metaspace usage because of the large amount of isolated classloaders in a large multi-module project.
For example, in the Ktor project apiDump task uses up to 4GB of metaspace memory.

It could lead to:

• Gradle Deamon being killed by OS on high memory pressure if -XX:MaxMetaspaceSize is not specified for a project (Setting org.gradle.jvmargs property can lead to "Daemon disappeared" failures gradle/gradle#19750)
• OutOfMemory: Metaspace if the specified -XX:MaxMetaspaceSize is not bug enough to hold all classes loaded by BCV

Is it possible to reduce the number of classloaders or decrease metaspace size in another way?

Relates to:

• Classes are not unloaded after BCV tasks #281