Connecting multiple debuggers to a debugee (Java,JPDA)

Hi, Ive been trying unsuccessfully to connect two client debuggers to a Debuggee program in context of JPDA. Is this possible or are there workarounds to make it happen?

I am using eclipse as the IDE (edit for typo). Think of a server program as a Hello World which Prints out: System.out.println("I have the String"); //1 System.out.println("You will have to pass through the breakpoints before you shall see"); System.out.println("breakpoints"); System.out.println("before you shall see"); //4

We can put breakpoints at lines 1 and 4.

Step 1: The Para's passed to the program in Run Configuration: -Xdebug -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=y

(server=y tells vm to behave like a server, suspend=y implies that prog execution will be suspended till debugger latches on to it) and Run the program.

Step 2: Go to Debug as , Debug config ,Remote Java application and create a new instance: Project: Same as before Connection type: Socket Attach(Socket Attach) Host:LocalHost Port:8000 Now when I debug Prog execution stops at the specified breakpoint. What I cant do is create another instance of this remote debugger that can latch on to the server(prog 1), I get a connection refused when I do that. Let me know if anyone else has faced this problem and if a workaround exists. Thanks!

Thanks

well The core idea is to allow debugging of mutually exclusive threads within the same Server process, Tried it manually to get a Connection Refused. Is there a existing protocol that allows listening on a new port if a request comes in at a existing port that is servicing another request?(Edit for Punctuation) Thank you for your comments Yuval and Fredrick.

javaresearcher 2010-10-19 23:09:29

Further I came across: http://download.oracle.com/javase/6/docs/technotes/guides/jpda/jpda_spis.html#TransportDev which talks about Developing a TransportService to support multiple concurrent connections to a single listener address. Now another question is has anyone made this or attempted to?

javaresearcher 2010-10-19 23:22:08

@javaresearcher keep listening on a port after accepting a connection is not a problem. The problem here is that it would make the whole debugging process extremely unintuitive. A bit like driving a car with three passengers and a set of steering wheels and pedals in front of each seat. Only one would be able to be in control at any given time or things would go terribly wrong. I think it would make more sense if you tried to explain why you are trying to do it. Maybe there is a much better way to do what you want. (edit: see the "core idea" in your top comment now but why two debuggers?)

Fredrik 2010-10-20 06:06:07

@Fredrik, Think cloud. Separate threads, mutually exclusive belonging to separate entities compartmentalized within a server process, But then each entity wants to debug its own Thread, though essentially it does not know what it is debugging is only a subset, Hope this sheds more light. I would love to hear if better ways exist.

javaresearcher 2010-10-20 06:26:20

@javaresearcher I am thinking cloud just about everyday of the week but the debugger you want to use is not even in that picture. Stopping the VM on a breakpoint is not an option in such an environment.

Fredrik 2010-10-20 13:40:43

@Fredrik, Thanks for your inputs!

javaresearcher 2010-10-20 16:56:03

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Connecting multiple debuggers to a debugee (Java,JPDA)

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