This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Hi all: I have a problem using jni in hp-ux 10.20. We are using jdk1.1.8. (these are project requirements). In hp-ux 10.20, g++ is not working when we use jni...it is throwing UnsatisfiedLinkError. Could anyone help me how to use jni with g++ complier and ld linker in hp-ux 10.20? I tried the alternate way to resolve this problem as follows: jni works fine with the aCC compiler. In our project, many programs had been compiled using g++. So, what i thought was i would use aCC complier for the program that use jni and g++ for the remaining programs (since i can not compile all these programs using aCC for some other problems). I would write here step by step what i had done... Step 1: javac JNIExample.java //this program invokes the native methods written in C++ Step 2: javah -jni JNIExample //javah creates the header file JNIExample.h
Step 3: g++ -fpic -shared -c MyCPP.cpp //this CPP program contains certain methods which are invoked by jniCPP.cpp //the output of this step is MyCPP.o Step 4: /opt/aCC/bin/aCC +z +u4 -c $JNI_INCLUDE jniCPP.cpp //this CPP program uses jni.h and defines methods (which are in JNIExample.h). I am using aCC complier so that it does not throw UnsatisfiedLinkError in hp-ux 10.20. since g++ compiler is not working in hp-ux 10.20 when we use jni //the output of this step is jniCPP.o Step 5: ld -b -o libServer.sl jniCPP.o MyCPP.o //link using 'ld' and create a shared library libServer.sl //this library had been loaded in JNIExample.java Step 6: java JNIExample //execute the program which invokes the native method When i do Step 6, i get the following error: /usr/lib/dld.sl: Unresolved symbol: __nw__FUi (code) from libServer.sl SIGABRT 6* abort (generated by abort(3) routine) Sig = 6; code = -1. stackbase=79D7F000, stackpointer=79D7F1C0 Abort(coredump)
What i feel is: I used ( aCC compiler & produced one object file ) and also ( used g++ compiler & produced one object file)...so it could not link these two object files...i don't know what i am thinking is correct or not? Could anyone please give me the solution either (to use g++ complier for jni successfully in hp-ux 10.20) or ( to resolve the problem occured when using aCC and g++ compilers) Thanks a lot in advance... Uma
Joined: Jun 14, 2001
I figured out the problem long back...just posting it over here... 1) The g++ compiler and aCC compiler use different name mangling scheme...So, it is NOT possible to link both these object files. 2) hp unix 10.20 does not support JNI with g++ compiler 3) hp unix 10.20 does not support STL
Hi Frank Carver: I had finished that work long back...since i was in a position to use (must use) g++ complier, i had written the code in C++ (socket programming) on hp-ux 10.20 [instead of jni] I was looking for Runtime.exec() for the following reason: A script should start the client and (servers, if loopback address)...i had written a java program to read an ini file and to start the servers (an exe and a .class files) using Runtime.exec()...the script will execute this java program in addition to some other works. Thanks a lot for your helps. Uma