Java – Unable to create JVM using jni_CreateJavaVM API in Fedora 8

I have created a PHP extension (written in C). I am using JNI to make java calls.

I use jni_CreateJavaVM to create JVM. This works fine in:

• IIS (windows)
• Apache (windows)
• PHP CLI (Fedora 8)

But when I try to load the same extension from Apache (in Fedore 8), the create jni_ CreateJavaVM return JNI _ERROR. I call jni _CreateJavaVM from PHP _RINIT _FUNCTION.

I though that it might be that my extension cannot loacate libjvm.so. So in the same code, before calling jni_ CreateJavaVM, I tried to load the libjvm.so library, and it was successful. Only when I call the jni function, it returns JNI_ERROR.

I used LD_ LOAD function to load libjvm.so. After loading the library I obtain pointer to jni_ CreateJavaVM method which is successful. Only when I make a call, using the pointer or direct jni_ CreateJavaVM call, it returns -1.

Is there any way to find out what went wrong during initialization?

Platfrom: Fedora 8
Java: Jdk 1.5 update 8
Php: Php version 5.3

Here is the code that I have written to initialize JVM.

typedef jint (JNICALL CreateJavaVM_t)(JavaVM **pvm, void **env, void *args);
typedef jint (JNICALL* GetDefaultJavaVMInitArgs_t)(void*);

CreateJavaVM_t *CreateJavaVM;
GetDefaultJavaVMInitArgs_t GetDefaultJavaVMInitArgs;
JavaVM* jvm;
JNIEnv* env;

void create_vm(void)
{       
    JavaVMOption vm_options;
    JavaVMInitArgs vm_args;
    int retval = 0;

    dl_handle = DL_LOAD("libjvm.so");       
    //The call is successful and I get the handle

    CreateJavaVM = (CreateJavaVM_t*)DL_FETCH_SYMBOL(dl_handle, "JNI_CreateJavaVM");
    //The call is successful and I get pointer to function

    GetDefaultJavaVMInitArgs = (GetDefaultJavaVMInitArgs_t)DL_FETCH_SYMBOL(dl_handle,"JNI_GetDefaultJavaVMInitArgs");
    //The call is successful and I get pointer to function

    vm_args.version = JNI_VERSION_1_4;
    vm_args.options = &vm_options;
    vm_args.nOptions = 0;
    vm_args.ignoreUnrecognized = JNI_FALSE;

(*GetDefaultJavaVMInitArgs)(&vm_args);

    retval = CreateJavaVM(&jvm, (void **)&env, &vm_args);
    //The retval is -1.

    //And if I do
    retval = JNI_CreateJavaVM(&jvm, (void**)&env, &vm_args);
    //This also returns -1
}