UnsatisfiedLinkError and java.library.path?

Question

I did look for this topic in this forum. The question has been asked, but I don't see an answer :(
I get an error at runtime...
"java.lang.UnsatisfiedLinkError: no EZTaxJavaCpp.dll in java.library.path
at java.lang.ClassLoader.loadLibrary(Unknown Source)"
Code...
public class EZTaxJNI {
private native void sendEZCmd(String cmd);
static{
System.loadLibrary("EZTaxJavaCpp.dll");
public static void main(String[] args) {
EZTaxJNI ez = new EZTaxJNI();
ez.sendEZCmd("control initialize");
System.out.println("JNI");
The dll exists. I tried adding the path with the dll name and it didn't work. I tried removing the .dll extention and no luck. Where do I set java.library.path?

Answer 1

regarding the dll not found :
- if you state System.loadLibrary(...) you need to put the dll into a system library (like system32)
- if you state System.load(....) you can/must specify the complete path to your dll
regarding the UnsatisfiedLinkError :
three reasons I can think of :
- if your java module belongs to a package, i.e. if you have a statement like
package com.hllapi;
in your code, then you need to state this in the native code like this
JNIEXPORT jstring JNICALL Java_com_hllapi_JRmmApi_runCommand (JNIEnv *env, jobject obj, jstring cmd)  
- something in the header file is wrong ?
I usually have the 'extern "C" .....' statement in the header file,
but I guess your way should work as well
- finally, I just realized, that you have two underscores in your statement after 'Java'
-> Java__EZTaxJNI_sendEZCmd(JNIEnv* env, jobject, jstring jMsg
this might be a problem
Hope this helps....