Make instrumentation fully automatic

[pron]

Determine potentially blocking methods by analyzing the call graph. Don't require manual designation of methods as blocking.

[mikehearn]

Status update: Java 9 now has a java.lang.LiveStackFrame API that gives access to locals, operands and monitors of the current stack frame. It's presently a bit buggy, see

https://bugs.openjdk.java.net/browse/JDK-8147039

but once those bugs are fixed, it would be possible (says Ron) to make an agent that doesn't need @Suspendable annotations at al, because the bytecodes can be instrumented just-in-time.

[circlespainter]

@mikehearn WIP in the jdk9 branch

[candrews]

https://bugs.openjdk.java.net/browse/JDK-8147039 has been fixed and https://jdk9.java.net/ has an easily access build available for download with that fix.

Is it possible for the jdk9 branch to be merged into master to facilitate easier development and testing at this time? Also, it looks like Travis CI supports JDK 9 early access builds, so it should be pretty easy to get CI working, too.

[circlespainter]

Unfortunately there is still https://bugs.openjdk.java.net/browse/JDK-8156073 (there's a test for it in https://bugs.openjdk.java.net/browse/JDK-8158879). Also, automatic instrumentation in the jdk9 branch is a major, long(er)-term feature development so I think it makes sense for it to stay separate for now.

[candrews]

Looks both of this JDK issues are now fixed.

It's been a while since the last info I can find out Java 9 support and automatical instrumentation - could you share the latest news?

[stevenschlansker]

I spent a couple of hours today trying to figure out the set of classes to instrument as @Suspendable in the Jackson JSON processor, and filed a pr to comsat. With this feature, it would have worked "out of the box", and everyone could have had the benefits without additional work or the need to include this metadata artifact! Would also love to hear of a status update, or if testers are needed.

[adelel1]

Hello @circlespainter , do you have a status update on this enhancement. Making the instrumentation automatic would be a great step forward.
Or is there an ETA/plan?
Thanks,