For the Leyden EA, if you dump the CacheDataStore with an incompatible module option, such as --module-path, the dumping operation will continue and *sometimes* mysteriously fail. See JDK-8335735

This fix will quit the VM early and print an explanation message:

$ rm -f hw.cds
$ java --module-path=foo.jar -cp /home/iklam/tmp/HelloWorld.jar -XX:CacheDataStore=hw.cds HelloWorld
[0.000s][warning][cds] optimized module handling/full module graph: disabled due to incompatible property: jdk.module.path=foo.jar
Error occurred during initialization of VM
CacheDataStore cannot be created because PreloadSharedClasses is enabled but full module graph is disabled


or


$ ~/Downloads/ruby/jruby-9.4.8.0/bin/jruby -J-XX:CacheDataStore=jruby.cds -e '10.times { org.jruby.Ruby.newInstance }'
[0.000s][warning][cds] optimized module handling/full module graph: disabled due to incompatible property: jdk.module.addopens=java.base/java.io=org.jruby.dist
Error occurred during initialization of VM
CacheDataStore cannot be created because PreloadSharedClasses is enabled but full module graph is disabled