Problems creating a Java Array using JNI-HELP!

Question

Hi,
I am trying to create a Java Array using JNI.I have posted the code below. The problem is that the oth element is added correctly to the Array but when the JVM gets to the next element...it goes for a toss. It is not able to create a new instance of the object in GetUGEntity() function...there seems to be some problem in creating a new instance of the object!
Can somebody help me with this?
jobject GetUGEntity(JNIEnv *env, UF_DISP_j3d_entity_t* entity_list)
     int numVerts=0, numStrips=0;
     jfieldID fid;
     jdoubleArray jTransform=NULL;
     jstring jstrName=NULL;
     jdoubleArray jNormals=NULL;
     //Init an Entity object
     cout<< "**Getting New Class Reference...";
     jclass jEntity = env->FindClass("Lcom/wipro/java3d/rmi/Entity;");
     cout << "**got Class reference..."<<endl;
     if (jEntity == NULL)
          return NULL;
     cout<<"Creating new object instance...";
     jmethodID mIDInit = env->GetMethodID(jEntity, "<init>", "()V");
     cout<<"Got java method id...";
     jobject javaObj = env->NewObject(jEntity, mIDInit);
     if (javaObj==NULL)
          return NULL;
     cout << "Created!" << endl;
     //Entity ID
     cout<< "**Setting eid...";
     fid=env->GetFieldID(jEntity,"eid","I");
     jint eid = (jint)(entity_list)->eid;
     env->SetIntField(javaObj, fid, eid);
     //env->DeleteLocalRef(eid);
     cout << "Done!" << endl;
     cout << "Done!" << endl;
     cout<< "**Returning jobject...";
     return javaObj;
jobjectArray createJArray(JNIEnv* env, UF_DISP_j3d_entity_t** entity_list, int noOfEntities )
     UF_DISP_j3d_entity_t* tempVar=NULL;
     cout<<"*Creating Jobjectarray...";
     jobjectArray jEntityArray = (jobjectArray) env->NewObjectArray(noOfEntities,
          env->FindClass("Lcom/wipro/java3d/rmi/Entity;"),NULL);
     cout<<"Created!"<<endl;
     for(int i=0; i<noOfEntities;++i)
          tempVar = &(*entity_list);
          if (tempVar !=NULL)
               cout<<"*Trying to get Entity...."<<endl;
               jobject jEntity = GetUGEntity(env, tempVar);
               if (jEntity!= NULL)
                    cout<<"Got Entity!" <<endl;
                    cout <<"*Setting Array Element....";
                    env->SetObjectArrayElement(jEntityArray, i, jEntity);
                    cout << "Done!" << endl;
               else
                    printf("ERROR: Did not get Entity Reference");
          else
               printf("ERROR: Got a NULL Reference!");
     return jEntityArray;

Answer 1

Hi Deepak,
Could you please let us know upto which line your code is going safe. Try printing the value in the structure before you send that to the method GetUGEntity().
I am not too sure that would be a problem. But I have faced a problem like this, wherein I tried to access a structure for which I have not allocated memory and hence got exception because of that.
Since your JNI code seems to be error free, I got doubt on your C part. Sorry.
Dhamo.