Failure when reapplying a probe for JDK 15 #431
Description
When BTrace is using invoke dynamic (indy) (instead of generating private static handler method which is frowned upon in JDK 14 and forbidden in JDK 15) the cushion methods (empty-bodied handler methods corresponding to removed probes) do not play nice with the Indy and cause the following error:
java.lang.UnsupportedOperationException: class redefinition failed: attempted to add a method
at java.instrument/sun.instrument.InstrumentationImpl.retransformClasses0(Native Method)
at java.instrument/sun.instrument.InstrumentationImpl.retransformClasses(InstrumentationImpl.java:167)
at org.openjdk.btrace.agent.Client.retransformLoaded(Client.java:500)
at org.openjdk.btrace.agent.Main$5.run(Main.java:878)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
at java.base/java.lang.Thread.run(Thread.java:832)