[cdt-debug-dev] question on how cdt make JNI call?

[Yan Chen <ychen5@xxxxxxxxxxxx>]

Hi,all!!!

I know this question maybe should not be asked in this mailing list, but
my question is somehow related to CDT codes. So any help is
appreciated!!!

My plugin need to load dynamic library and make JNI call, but until now
I do not have any luck. Under terminal I can load .so and make JNI call
without any problem, but I have no idea why my eclipse plugin can not
make JNI call(by using system.load() or system.loadLibrary()).  To
access native libraries in eclipse Do I need to set up correctly the
path in the plugin.xml? and how?

By reading CDT code, I found CDT also make JNI call, so I did a test as
follows:

I first made libSpawnerOutputStream.so and then I put it in the
directory org.eclipse.cdt.core.linux/os/linux/x86 where libspawner.so
is. Then I added my stuff in the class SpawnerOutputStream as follows:

public class SpawnerOutputStream extends OutputStream {
     
       
	public void write(byte[] b, int off, int len) throws IOException {
	        
		write0(fd, tmpBuf, len);

                /*****My stuff**********/
		greeting();
                /*****My stuff**********/
	}

	private native int write0(int fd, byte[] b, int len) throws
IOException;
	private native int close0(int fd);

        /*****My stuff**********/
	public static native void greeting();
	/*****My stuff**********/
        

	static {
		System.loadLibrary("spawner"); //$NON-NLS-1$

                /*****My stuff**********/
		System.loadLibrary("SpawnerOutputStream");
                /*****My stuff**********/
	}

}

But when I start debugging a c program, I got the following error:

java.lang.UnsatisfiedLinkError: greeting
	at org.eclipse.cdt.utils.spawner.SpawnerOutputStream.greeting(Native
Method)
	at
org.eclipse.cdt.utils.spawner.SpawnerOutputStream.write(SpawnerOutputStream.java:50)
	at java.io.OutputStream.write(OutputStream.java:58)
	at org.eclipse.cdt.debug.mi.core.TxThread.run(TxThread.java:72)

Could someone help me out? Thanks in advance!!!

Johnny




P.S. The following codes are for making .so file

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class SpawnerOutputStream */

#ifndef _Included_SpawnerOutputStream
#define _Included_SpawnerOutputStream
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     SpawnerOutputStream
 * Method:    greeting
 * Signature: ()V
 */
JNIEXPORT void JNICALL Java_SpawnerOutputStream_greeting
  (JNIEnv *, jclass);

#ifdef __cplusplus
}
#endif
#endif


/**
 * @version 1.10 1997-07-01
 * @author Cay Horstmann
 */

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

JNIEXPORT void JNICALL Java_SpawnerOutputStream_greeting
  (JNIEnv* env, jclass cl)
{  printf("Hello world!\n");
}