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Mac Forum / Programming / CodeWarrior / January 2004JNI debugging
Hi All, I'm using CW 8.3 on MacOS X 10.2.8 with Java 1.4.1 update 1. I am setting up a project which has two main parts. The first is a C++ dynamic library, built with CW. The second is a Java app that calls the library through JNI. This all works fine except I cannot debug the C++ code in the library. I can open the dll in the IDE and set breakpoints but CW does not break on these. Once I start debugging the Java app I open the Processes window and try to attach the 'java' process. Here the whole IDE crashes out. I am working from the 'JNI example' in the CW examples and this crashes in the same manner. Interestingly it did work just once but I have not been able to repeat this. In this case I noticed that there was a process gdb-something? in the Process window. Is there something I have not installed or perhaps a gdb process that needs to be started? I also have whole C++ Powerplant apps that I can debug OK. Paul dans l'article c50c80ac.0401041813.7e379833@posting.google.com, Paul Turner à paul_aeronaut@mac.com a écrit le 5/01/04 3:13 : > Hi All, > [quoted text clipped - 22 lines] > > Paul Paul, I do the same thing and found that CW is bugged there. This was confirmed by MW Ron. However I found the following workaround: - in the processes window, try to attach a 'small' process first. I usually attach the dock process. Apparently this helps CW to initialize the C debugger witout crashing. Resume the process. - now you should be able to attach the java process Eric > I do the same thing and found that CW is bugged there. This was confirmed by > MW Ron. However I found the following workaround: [quoted text clipped - 4 lines] > > Eric Thank you. Attching a small process, like the Dock, first did enable me to attach my own Java process and debug on the C++ dyn lib side. The problem I now have is that the thread that is created to debug the library (called libmathCommon.A.dylib) does not die when the Java app quits. If I try to kill it I get a Bus Error message. There is also the gdb-powerpc-appl process still running according to the Process window. If I try to run the Java app again the IDE again crashes when I try to attach the Java process. I have to quit the IDE and relaunch to get it to clear. The whole process seems quite unstable as a working method. The IDE will crash out if I deviate from the single working method I have so far. I also seem to have more problems if I put break points in both the Java code and the C++ library. How do you find this in practice? Any tips? Paul dans l'article c50c80ac.0401051958.3b95e53d@posting.google.com, Paul Turner à paul_aeronaut@mac.com a écrit le 6/01/04 4:58 : >> I do the same thing and found that CW is bugged there. This was confirmed by >> MW Ron. However I found the following workaround: [quoted text clipped - 25 lines] > > Paul I have not met all the problems you mention so I cannot help you further. But yes, the whole process IS unstable. I find it so painful that I created a small c++ app to debug the dylib. I only use this method to trace JNI related bugs. I haven't been able to do any JNI debugging in Xcode, so currently this method is the ONLY method I know to debug JNI libraries. Good luck Eric > I haven't been able to do any JNI debugging in Xcode, so currently this > method is the ONLY method I know to debug JNI libraries. GDB works fine for debugging JNI. You might even be able to get it to work in Xcode by setting the debugger for your Java project to GDB rather than the Java debugger. -Eric  SignatureEric Albert ejalbert@cs.stanford.edu http://rescomp.stanford.edu/~ejalbert/ dans l'article ejalbert-B025D1.02495107012004@news.stanford.edu, Eric Albert à ejalbert@cs.stanford.edu a écrit le 7/01/04 11:49 : >> I haven't been able to do any JNI debugging in Xcode, so currently this >> method is the ONLY method I know to debug JNI libraries. [quoted text clipped - 4 lines] > > -Eric What I'm speaking about is the ability to debug both Java and C++ code. Can you do this with Xcode ? Eric >What I'm speaking about is the ability to debug both Java and C++ code. Can >you do this with Xcode ? Not at the same time. But you can debug using one in Xcode, and the other in a terminal. Alternately you can debug for awhile in one mode, exit, and then re-start getting there in the other mode. dans l'article Pa4Lb.7034$851.2435@newssvr27.news.prodigy.com, bolsinga@hotmail.com à bolsinga@hotmail.com a écrit le 8/01/04 4:31 : >> What I'm speaking about is the ability to debug both Java and C++ code. Can >> you do this with Xcode ? > > Not at the same time. But you can debug using one in Xcode, and the other in a > terminal. Alternately you can debug for awhile in one mode, exit, and then > re-start getting there in the other mode. This is why I'm using CW 8.3. You can debug both at the same time. Eric |
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