JNI Error in passing array

I'm new to JNI programs. I'm doing one JNI code in which I need to pass array value from C to Java. While displaying in java the previous values are considered in array. As i'm new to JNI i couldn't solve this. This is the code:

FieldAccess.java

Code:

---

public class FieldAccess {
  public static void main(String args[]) {
    next[] Nxt;
    next n=new next();
    n.h=new String[2];
    Nxt=n.arrayFields();
    for(int i=0;i<Nxt.length;i++) {
      System.out.println("In Java i= "+i+" g Val= "+Nxt[i].g);
      for(int j=0;j<2;j++) {
        System.out.println("In Java i= "+i+" h Val= "+Nxt[i].h[j]);
      }
    }
  }
  static {
    System.out.println("Hello");
    System.loadLibrary("FieldAccess");
  }
}

---

next.java

Code:

---

public class next{
  public String g;
  public String h[];
  public  native next[] arrayFields();
  static {
    System.out.println("Hello");
    System.loadLibrary("FieldAccess");
  }
}

---

FieldAccess.c

Code:

---

JNIEXPORT jobjectArray JNICALL Java_next_arrayFields(JNIEnv *env, jobject jobj) {
  jobjectArray ret;
  int i,j;
  printf("Hello");
  jclass cls = (*env)->FindClass(env,"next");
  ret= (jobjectArray)(*env)->NewObjectArray(env,50,cls,NULL);
  if(ret==NULL) {
    ret=NULL;
  }
  for(i=0;i<10;i++) {
    jobject remoteNode = (*env)->AllocObject(env,cls);
    if (remoteNode == NULL) {
      ret = NULL;
    }
    jfieldID fid,fid1;
    fid = (*env)->GetFieldID(env,cls, "g", "Ljava/lang/String;");
    fid1 = (*env)->GetFieldID(env,cls, "h", "[Ljava/lang/String;");
    if (fid == NULL) {
      ret = NULL;
    }
    if (fid1 == NULL) {
      ret = NULL;
    }
    jstring kk= (*env)->NewStringUTF(env,"Hi");
    (*env)->SetObjectField(env,remoteNode, fid,(jstring)kk);   
    jstring str[2];
    for(j=0;j<2;j++) {
      str[0]=(*env)->NewStringUTF(env,"jj");
      str[1]=(*env)->NewStringUTF(env,"Hello");
    }
    (*env)->SetObjectField(env,remoteNode, fid1, (jstring)str);
    (*env)->SetObjectArrayElement(env,ret, i, remoteNode);
  }
  return ret;
}

---

The output I'm getting is:

Code:

---

In Java i= 0 g Val= Hi
In Java i= 0 h Val= Hi
In Java i= 0 h Val= jj
In Java i= 1 g Val= Hi
In Java i= 1 h Val= Hi
In Java i= 1 h Val= jj
In Java i= 2 g Val= Hi
In Java i= 2 h Val= Hi
In Java i= 2 h Val= jj
In Java i= 3 g Val= Hi
In Java i= 3 h Val= Hi
In Java i= 3 h Val= jj
In Java i= 4 g Val= Hi
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out                         
of range: -253510696
at java.lang.String.getChars(String.java:724)
at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:394)
at java.lang.StringBuilder.append(StringBuilder.java:120)
at FieldAccess.main(FieldAccess.java:94)

---

Please any one help

It's a long time since I did any JNI so this advice may not be correct but it looks to me like you aren't setting the h array correctly. I think you need to assign a new object array of type string to h ie:

Code:

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fid1 = (*env)->NewObjectArray(env, 2, env->FindClass("java/lang/String"), NULL);

---

and fill it from str ie

Code:

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(*env)->SetObjectArrayRegion(env, fid1, 0, 2, str);

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There is no functions in JNI like SetObjectArrayRegion. Give me any other option.

Sorry, I did say it had been a long time since I did any of this.
I think the problem is with the line

Code:

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(*env)->SetObjectField(env,remoteNode, fid1, (jstring)str);

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I'm just not sure what you need to do to sort it. Maybe try iterating over str and use SetObjectArrayElement to set each array element.