JNI Problem - JAVA invoke C++ and the way back from C++ to JAVA

Hi @ all!
I am a computer science student and I have a problem with the JNI Interface.
First the program structure:
We have a Java GUI a wrapper and a C++ protocol. That is the general communication way:
left side:
JAVA GUI
|
Wrapper (JAVA)
|
C++ protocol
|
|
Network transfer
|
|
C++ protocol
|
Wrapper (JAVA)
|
JAVA Gui
The program sequence is following:
- The GUI will be started and call a protocol init method in the native code. The JAVA and C++ instance are already running!!
- The protocol handles some information.
- Then the left side e.g. invoke a method. The protocol transmits the packet to the other side. But HERE is the problem. On the other side the protocol must call a static JAVA Method from the running JAVA instance.
I have no idea how I can handle this problem. I tried to save the env pointer und the jobject at the first invocation from Java to C++. With this elements I tried to getObjectClass(saved jobject) and tried to invoke the static JAVA method but I got a SIGSEGV from the JVM.
How can I solve this problem??
By the way, I generate through the java wrapper my C++ header and the the Java wrapper load a shared object!
I work with a Gentoo System and with Java 1.5.
I hope anybody can help me!
Cheers,
Edited by: polo6n2 on Jul 3, 2008 1:04 AM

You mean the communication is aschronous?
Then the C++ side will have a C++ thread. That thread calls a method. That method FIRST uses the JNI method to attache the thread.
Then you look up whatever you need in java, maybe a class and you call JNI methods to interact with it.
If you don't attach the thread it will not work.
JAVA method but I got a SIGSEGVThen you did something wrong in your C++ code.

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JNI Problem - JAVA invoke C++ and the way back from C++ to JAVA

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