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Is a Java program debuggable only when the VM is running in Debug Mode?
Is there any way to change it at runtime?

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No, there's no way to change it at runtime.

If at all possible, you will have to use a profiler

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I found the jinfo is available for changing some flags of VMs. But as you mean it could not be used to turn on something like the Debug mode, am I right?
~O~. In my mind, I just consider the profiler as an performance analysis. Thanks I will have a try later. I am interested in what it could show out~
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I don't believe you can suddenly debug if it's not compiled with the -g option. Your only option is to recompile and redeploy. But once it's in place you can debug at will.

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the question is about java not gcc
Does that mean you guys normal use other facilities to find out the system problems like event log except the jdb?
When a running system meet an issue and the program is not running on debug mode, Should I trace out the problem via the event log?
In GDB world, I could load the symbols files into the debugger, when I need them. Do you mean the Java could not do it?

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