Christian Dupuis opened SPR-11083 and commented
The JVM Attach API requires an Agent to implement a agentmain method and specify the agent in the MANIFEST.MF using the Agent-Class header.
For reference see http://docs.oracle.com/javase/6/docs/jdk/api/attach/spec/index.html and https://blogs.oracle.com/CoreJavaTechTips/entry/the_attach_api.
Currently InstrumentationSavingAgent can only be used with -javaagent.
Affects: 4.0 RC1
Referenced from: commits 63c143b, f6f0adf