Step 2: Generate Header File

1) Use javah tool from JDK to create header file.

2) Target your compiled class file.

3) Be sure to use the -jni switch:

%javah -jni HelloWorld

4) For older, non-JNI header files, use the -stub

option with javah. (Ask: why are you using the old native invocation anyway? Consider upgrading to 1.1)

5) Don’t edit the source Java file (e.g., even

adding a package statements invalidates the

header file.)

This should create a header file essential

for your implementation . . .