Name: chT40241 Date: 01/29/98


When the symcjit is used, native methods defined via the RegisterNatives JNI call are not called, and instead an UnsatisfiedLinkError is thrown. The code works without the JIT.

Here is a simple test case. The Java code (JITterBug.java):

public class JITterBug {
static native void direct();
static native void indirect();
public static void main(String args[]) {
direct();
try {
indirect();
} catch(Throwable t) {
t.printStackTrace();
}
}
static {
System.loadLibrary("JITterBugC");
}
}

and the C code (JITterBugC.c):

#include "jni.h"
#include <stdio.h>

__declspec(dllexport) void __stdcall Java_JITterBug_direct(void *, jobject);
void __stdcall IndirectMethod(void *, jobject);

__declspec(dllexport) void __stdcall Java_JITterBug_direct(void *Jenv, jobject This)
{
int rc;
JNIEnv *env = (JNIEnv *) Jenv;
JNINativeMethod methods[1] = {
{ "indirect", "()V", &IndirectMethod }};
fprintf(stderr, "Entered direct() method.\n");
rc = (*env)->RegisterNatives(env, This, methods, 1);
if (rc != 0) fprintf(stderr, "RegisterNatives failed!\n");
}

void __stdcall IndirectMethod(void *env, jobject This)
{
fprintf(stderr, "Entered indirect() method.\n");
}

Without the JIT, stderr indicates that IndirectMethod was called, while with the JIT it shows an UnsatisfiedLinkError being thrown.


chuck.hickey@Eng 1998-01-30

I deleted their suggested fix, which had an error, and placed the most
recent fix in "Suggested Fix"