JNI to bind C++ and JAVA : undefined symbol: __gxx_personality_v0

I am trying to link a Java swing frontend to the c++ backend using JNI. I am able to generate a class file and header file for that class. I could also write the .cpp file and also generate a library file. But when I try to run my application I get an error undefined symbol: __gxx_personality_v0. I went through many examples on stackoverflow but none of it worked in my case. I made sure I have libgcc, libgcj and libstd++. Also added pragma GCC java_exceptions on the top of the JNI header file. But none of these worked.

Java file - InitJNI.java

public class InitJNI {
public native String callMethod(String str);

public static void init(String s){
    System.out.println("-------inside InitJNI.java--------");
    System.loadLibrary("eg1");
    System.out.println("Library loaded in InitJNI--------");
    InitJNI init1 = new InitJNI();
    init1.callMethod(s);
}

}

JNI header file - InitJNI.h

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class org_openscience_jchempaint_application_InitJNI */

#ifndef _Included_InitJNI
#define _Included_InitJNI
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     InitJNI
 * Method:    callMethod
 * Signature: (Ljava/lang/String;)Ljava/lang/String;
 */
JNIEXPORT jstring JNICALL Java_InitJNI_callMethod
  (JNIEnv *, jobject, jstring);

#ifdef __cplusplus
}
#endif
#endif

Cpp file - InitJNI.cpp

#include "InitJNI.h"
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#pragma GCC java_exceptions


JNIEXPORT jstring JNICALL Java_InitJNI_callMethod
  (JNIEnv * env, jobject, jstring string){
    char buf[128];
    const char *str = env->GetStringUTFChars(string, NULL);
    printf("%s", str);
    env->ReleaseStringUTFChars(string, str);
}

I am trying to create a shared lib using command:

g++ -shared -fpic -o libeg1.so -I/usr/java/include -I/usr/java/include/linux InitJNI.cpp 

Which generates libeg1.so file. But my application does not run. It gives me undefined symbol: __gxx_personality_v0 Any help with this is appreciated. Thank you!