Recommendation of returning jintArray or jobjectArray

I have a somewhat simple issue I am trying to resolve,
does anyone know how to for example, return a array of integers when a call to a native method is invoked.
I would need to assign a single dimension array of 30 or more integers on the C++ side and either return a jobjectArray or jintArray. This is quite simple but I dont understand all the mechanism to go from java to C++ and then return an object in a Java friendly format from the native C++ code. The difficulty I am having is reference material and understanding syntax like:
env->SetIntArrayRegion( jints, 0, 31, ints );
I see the code and can follow, but I would like to know more about what is going on in the background. I dont have any good reference material. I have scavanged some code off this site regarding returning String arrays or in C++ terms char* arrays.
I see the code but dont really understand all thats going on in the background. If anyone has suggestion on where this reference material would be most accessible, please enlighten me. thanks

You need to buy a book. JNI is not simple. Best book - not great - that I have found is
Essential JNI - Rob Gordon

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Roy,
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Hi,
First please apologize if this question has already been asked. I've looked at the archives and I haven't found any answer to these problems. Thanks to take the time to read this quite long post, but I've tried to be sufficiently explicit...
So, here's what I want to do: in the native code, generate a list (ArrayList) with some integers in it. I must add that I'm not a Java expert.
Here's the java code calling the native function:
package be.ac.umrtc;
public class Main {
     public native List computeRoute(int src, int dst, float reservation)
     static{
          System.loadlibrary("cspf");
     public static void main(String[] args) throws Exception{
     List path = new Main().computeRoute(lsp.getFrom(),lsp.getTo(),lsp.getReservation());
Now the native code:
#include <jni.h>
#include "be_ac_umrtc_Main.h"
JNIEXPORT void JNICALL Java_be_ac_umrtc_Main_computeRoute(JNIEnv *env, jobject obj, jint src, jint dst, jfloat reservation){
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          return NULL; // exception thrown
     cid = (*env)->GetMethodID(env,arraylistClass,"<init>","()V");
     if (cid == NULL){
          return NULL; // exception thrown
     arraylist = (*env)->NewObject(env, arraylistClass, cid);
     tempClass = (*env)->GetObjectClass(env,arraylist);
     jmethodID mid = (*env)->GetMethodID(env,tempClass,"add","(Ljava/lang/Object;)Z");
     while (longListPopBack(&computedroute,&value2)!=-1){
          fprintf(stderr,"Valeur de value: %d\n", value2);
          if (mid==0){
               return;
          fprintf(stderr,"%d\n", bool = (*env)->CallBooleanMethod(env, arraylist, mid, value2));
(*env)->DeleteLocalRef(env, arraylistClass);
return arrayList;
I get a NoClassDefFoundError on java/lang/ArrayList.
So, I've tried to pass a List object "path" as argument to the native method (created in java)
and proceed with:
arraylistClass = (*env)->GetObjectClass(env,path);
instead of FindClass.
It seems to work well, the first call to callBoleanMethod returns 1. But then, the next call in the loop ends in a VM ERROR:
HotSpot Internal Error, VM Error
# HotSpot Virtual Machine Error, Internal Error
# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
# Java VM: Java HotSpot(TM) Client VM (1.4.2_03-b02 mixed mode)
# Error ID: 43113F32554E54494D45110E4350500308
# Problematic Thread: prio=1 tid=0x08052c30 nid=0x346d runnable
Heap at VM Abort:
Heap
def new generation total 576K, used 0K [0x44df0000, 0x44e90000, 0x452d0000)
eden space 512K, 0% used [0x44df0000, 0x44df02a8, 0x44e70000)
from space 64K, 0% used [0x44e80000, 0x44e80000, 0x44e90000)
to space 64K, 0% used [0x44e70000, 0x44e70000, 0x44e80000)
tenured generation total 3724K, used 2233K [0x452d0000, 0x45673000, 0x48df0000)
the space 3724K, 59% used [0x452d0000, 0x454fe540, 0x454fe600, 0x45673000)
compacting perm gen total 4096K, used 3166K [0x48df0000, 0x491f0000, 0x4cdf0000)
the space 4096K, 77% used [0x48df0000, 0x49107890, 0x49107a00, 0x491f0000)
Java Result: 129
The questions are thus:
1. why does FindClass not work?
2. why does the second call to callboleanmethod fails?
Thanks a lot for your help.
Olivier

Thanks, so now I just want to return an array of integers.
int[] computeRoute(...); in JAVA
JNIEXPORT jintArray JNICALL Java_be_ac_umrtc_Main_computeRoute(JNIEnv *env, jobject obj, jint src, jint dst, jfloat reservation){
int intarray[size];
return intarray;
does not work
I've tried casting : return (jintArray) intarray;
but no success
How can I create a jintArray? And then how to insert elements in this jintArray? I've seen in the books and the tutorial how to get element from such a jintArray passed as argument... but how to create it (how to fix size when creating it) and how to set elements is not evident to me.
Thanks for your patience.

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Hi
I'm trying to access a vector of Recommendations held by a Person object, but I don't want to allow direct access to the vector, just the information contained in it
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Hi,
I am trying to return a string array in the native function to java and i get the follwing error when i run the java class file
Exception in thread "main" java.lang.ArrayStoreException
at ArrayHandler.returnArray(Native Method)
at ArrayHandler.main(ArrayHandler.java:10)
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static{
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#include <jni.h>
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int i;
char *message[5]= {"first",
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for(i=0;i<5;i++) {
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I found out the mistake
jclass intArrCls = (*env)->FindClass(env, "[Ljava/lang/String;"); should have been
jclass intArrCls = (*env)->FindClass(env, "Ljava/lang/String;");

Movement type 317 does not currently support serial number management

Movement type 317 - support serial number management?
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u201CMovement type 317 does not currently support Serial number managementu201D
Movement type 317 does not currently support serial number management
Message no. IO306
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Recommendation of returning jintArray or jobjectArray

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