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I am looking for potentially a JDI API to pause the JVM at any arbitrary point during its execution. Looking at the BreakPointRequest createBreakpointRequest method needs a specific location. Is there any other API that does not need a location or someway to get current Location that could be passed to create a breakpoint.

I am basically looking for a way to attach and pause the application, then use JVMTI agent to receive callback for the BreakPoint event to perform further processing. Thanks

anurag
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  • You want to halt JVM or application? if I understand correctly, one jvm may host multiple applications. If it is Jvm, Virtualmachine class, process method may be worth to research on for your req. – kosa Jan 15 '12 at 08:06

3 Answers3

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Breakpoints only make sense with a location in source. Arbitrary pausing your application is probably best done by suspending all the threads currently running in the JVM. Take a look at SuspendThreadList() or SuspendThread in jvmti. This mechanism would be the 'pause' you are looking for.

linuxuser27
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If you want to arbitrarily pause a running jvm with JDI, you would use the JDI VirtualMachine interface's suspend method.

However, this doesn't really give you much in terms of being able to then connect to a jvmti agent; as the other answer points out, the jvmti has its own methods for doing the same thing.

If you're looking for a way to define arbitrary callbacks for breakpoints, as opposed to calling out to a specific agent, you might be interested in jdiscript, which is a scripting layer around the JDI that lets you do such things pretty easily in straight Java, rather than having to drop into C++.

jfager
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i think jdb - The Java Debugger will be the best option. please check the url about the jdb

http://docs.oracle.com/javase/1.3/docs/tooldocs/solaris/jdb.html

Abin Manathoor Devasia
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