Accessing a native method from within a packaged class

Question

I have seen some very useful information from RPaul. However, I can not quite get it to work.
I have a class "JNIGetUserId" that is in a package "com.services.localoptions". I am trying to call a native method from a dll. it works fine at the default package level. But not in the package. I have tried adding the "_" between each level of the directory in the h and c++ files. I also found that doing a javah at the top of the package structure it includes some information in the h file. A "_0005" shows up between each level.
This is on Windows XP. I am also using VisualAge for Java. I also am using JDK 1.3.1.
The source files:
package com.services.localoptions;
* This class provides the JNI Interface to call the
* AD User Maintainence routines.
* These routines are stored in the JNIGetUserIdLibrary.dll.
* The routines are:
* <ul>
* <li>getUser - returns a string containing the User Id
* <eul>
* @author: Ray Rowehl
* @date (10/15/2003 10:30:59 AM)
public class JNIGetUserId
     // Load the library
     static
     try
          System.out.println("loading dll");
     System.loadLibrary("JNIGetUserIdLibrary");
     System.out.println("loaded dll");
     catch (UnsatisfiedLinkError ue)
          System.out.println("Link Error");
* native C++ method to call getUserId routine
public native String getUser() throws Exception;
* This method allows us to test standalone..
* Creation date: (10/16/2003 2:08:58 PM)
* @param args java.lang.String[]
public static void main(String[] args)
     try
          System.out.println("Trying method 3");
          JNIGetUserId lGUD = new JNIGetUserId();
          System.out.println(lGUD.getUser());
     catch (Exception e)
          System.out.println("Got an exception " + e);
          e.printStackTrace();
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class JNIGetUserId */
#ifndef IncludedJNIGetUserId
#define IncludedJNIGetUserId
#ifdef __cplusplus
extern "C" {
#endif
* Class: JNIGetUserId
* Method: getUser
* Signature: ()Ljava/lang/String;
JNIEXPORT jstring JNICALL Java_com_localoptions_JNIGetUserId_getUser
(JNIEnv *, jobject);
#ifdef __cplusplus
#endif
#endif
// Implements method to return a string to Java
// C++ core header
#include <iostream.h>
// header from Java Interface
#include "JNIGetUserId.h"
#include "JNIGetUserId2.h"
// returns a string back to Java for package structure
JNIEXPORT jstring JNICALL Java_com_services_localoptions_JNIGetUserId_getUser
( JNIEnv * env, jobject thisObject )
     // set up constant user id for testing return
     char* userid = "RROWEHLP";
     // return userid to caller
     return env->NewStringUTF( userid );     
// returns a string back to Java for flat structure
JNIEXPORT jstring JNICALL Java_JNIGetUserId_getUser
( JNIEnv * env1, jobject thisObject1 )
     // set up constant user id for testing return
     char* userid1 = "RROWEHL1";
     // return userid to caller
     return env1->NewStringUTF( userid1 );     
}

Answer 1

Ok. A co-worker figured it out for me. The key thing is to do "javah com.services.localoptions.JNIGetUserId". Note the use of "." instead of "\". Running on windows, I was used to doing "\". That was part of the problem. Another key is doing the javah at the top of the package structure. This was mentioned in a post over at IBM.
We got our JNI stuff working now. thanks, ray.