UnsatisfiedLinkError when loading library from within package

Question

I have a piece of working code (simplified for easier reading):
NativeLibraryLoader.java
public class NativeLibraryLoader{
     static { System.loadLibrary("TheLibrary"); }
     public static native void someFunction(String someVariable);
     public static void main (String[] args) {
          int someInt = SomeClass.anotherFunction();
          System.out.println(someFunction("string"));
}SomeClass.java
public class SomeClass{
     public static int anotherFunction(){
          return 1;
}This all works great and does what I want it to do.
However: If I add the line
package com.yifanlu;to the beginning of both files, I get the following error: Exception in thread "main" java.lang.UnsatisfiedLinkError: com.yifanlu.someFunction
For some reason it can't find my library file. What's even weirder is that if I change the line in NativeLibraryLoader.java from "static { System.loadLibrary("TheLibrary"); }" to "static { System.load("C:/TheLibrary.dll"); }" (which exists), I still get the same error.
Is there some rule for packages and JNI I should know about?

Answer 1

When you change the package it changes the C/C++ function name that must be used so you must re-run javah and update the C/C++ method names so as to match those generated by javah.