Undefined Reference to JNI_CreateJavaVM Eclipse and Linux

Question

I am using Ubuntu 10.04 with Omnet++ 4.0p1 and JSimpleModule (which uses SWIG to make Java wrappers for the C++ methods found in Omnet++). I am trying to create a simulation in Java using the 2 above libraries, and when I am trying to build the project I am getting 'Undefined Reference to JNI_CreateJavaVM' as an error in JUtil.cc (which is code supplied by JSimpleModule). I have been looking around and I am including all of the proper libraries and it still isn't fixing anything. In the Omnet++ IDE (Eclipse) I am including:

/usr/lib/jvm/java-6-openjdk/include
/usr/lib/jvm/java-6-openjdk/include/linux
/usr/lib/jvm/java-6-openjdk/jre/lib/i386/client

and am linking:

/usr/lib/jvm/java-6-openjdk/jre/lib
/usr/lib/jvm/java-6-openjdk/jre/lib/client
-ljvm

I also tried compiling from the terminal using opp_makemake (which creates a Makefile) with the following parameters:

-I/usr/lib/jvm/java-6-openjdk/include
-I/usr/lib/jvm/java-6-openjdk/include/linux
-I/usr/lib/jvm/java-6-openjdk/jre/lib/i386/client
-L/usr/lib/jvm/java-6-openjdk/jre/lib
-L/usr/lib/jvm/java-6-openjdk/jre/lib/client -ljvm

Here is the beginning of JUtil.cc up to the error (note: jni.h is included in JUtil.h):

#include "JUtil.h"
#include "JSimpleModule.h"

//#define DEBUGPRINTF printf
#define DEBUGPRINTF (void)

#ifdef _WIN32
#define PATH_SEP ";"
#else
#define PATH_SEP ":"
#endif

// This will come from the generated SimkernelJNI_registerNatives.cc
void SimkernelJNI_registerNatives(JNIEnv *jenv);

JavaVM *JUtil::vm;
JNIEnv *JUtil::jenv;


void JUtil::initJVM()
{
    DEBUGPRINTF("Starting JVM...\n");
    JavaVMInitArgs vm_args;
    JavaVMOption options[10];

    int n = 0;
    const char *classpath = getenv("CLASSPATH");
    if (!classpath)
        opp_error("CLASSPATH environment variable is not set");
    // FIXME remove hack once IDE builds the classpath corretcly
    const char *classpath2 = getenv("CLASSPATH2");
    std::string classpathOption = std::string("-Djava.class.path=")+(classpath2 ? classpath2 : "")+PATH_SEP+(classpath ? classpath : "");
    options[n++].optionString = (char *)classpathOption.c_str(); /* user classes */
    options[n++].optionString = (char *)"-Djava.library.path=."; /* set native library path */
    //options[n++].optionString = "-Djava.compiler=NONE";    /* disable JIT */
    //options[n++].optionString = "-verbose:jni";            /* print JNI-related messages */
    //options[n++].optionString = "-verbose:class";          /* print class loading messages */

    vm_args.version = JNI_VERSION_1_2;
    vm_args.options = options;
    vm_args.nOptions = n;
    vm_args.ignoreUnrecognized = true;

    int res = JNI_CreateJavaVM(&vm, (void **)&jenv, &vm_args);
    if (res<0)
        opp_error("Could not create Java VM: JNI_CreateJavaVM returned %d", res);

    DEBUGPRINTF("Registering native methods...\n");
    SimkernelJNI_registerNatives(jenv);
    DEBUGPRINTF("Done.\n");
}

If someone knows anything on how to fix this, that would be greatly appreciated. Thanks.

I'm not sure, what is the jvm static lib file name? If it is libjvm.so, then yes. — user2049080, Aug 19 '13 at 14:41
Please take look to this http://stackoverflow.com/questions/9923495/undefined-reference-shm-open-already-add-lrt-flag-here/9923523#9923523;http://stackoverflow.com/questions/16860021/undefined-reference-to-jni-createjavavm-linux;http://stackoverflow.com/questions/17070879/jni-java-to-c-in-eclipse-undefined-reference-to-imp-jni-createjavavm12 — nabroyan, Aug 19 '13 at 19:28
http://stackoverflow.com/questions/16860021/undefined-reference-to-jni-createjavavm-linux — nabroyan, Aug 19 '13 at 19:29
In both of those links, it says to put `-ljvm` after the file that uses that library. But if I am compiling in Eclipse, how would I do that? — user2049080, Aug 20 '13 at 13:21
Ya I did, I showed that in my question, but is that right? I went to Project>Properties>Library Paths and added it at the end of the list — user2049080, Aug 20 '13 at 14:18
Okay, I added changed it to `-L/usr/lib/jvm/java-6-openjdk/jre/lib/i386/client/libjvm.so -ljvm` and I am still getting the error — user2049080, Aug 21 '13 at 12:09

Undefined Reference to JNI_CreateJavaVM Eclipse and Linux

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