问题
I know about the (jvm) startup options to have the jvm wait until a debugger is attached - this is not what I mean here.
Is it possible from within Java code to also detect attachment of a debugger, so that I could e.g. write a "script" that is doing some stuff and then at a certain point make my app wait for the debugger?
回答1:
No. The options are JVM options, and no Javacode is executed before the debugger connects. You can however let the app start, and spinloop on a getter for a variable, which you set from the debugger to let your app continue.
回答2:
Depending on what you'd like to do, it might be worthwhile investigating the onthrow JDWP sub-option. I haven't actually tried this ;-) but it seems like you could create a special exception type that you throw and catch to trigger JVM suspension. As shown in the linked examples, combining with launch can provide for some interesting alternatives. Of course, the logic/workflow is different from what you've expressed, but it's something to think about...
回答3:
see Determine if a java application is in debug mode in Eclipse for detecting debugger
You could user TimerTask to poll for attachment
来源：https://stackoverflow.com/questions/5393403/can-a-java-application-detect-that-a-debugger-is-attached