Undefined Reference to JNI_CreateJavaVM Eclipse and Linux - java-native-interface

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.