Java HotSpot Virtual Machine

Hello friends.

Have searched the forum, but haven's found the answer.
I need to access a Java two dimensional array from C ( boolean[][] a; ).

Here's the code in C:

  jbooleanArray aArray;  
  jboolean **a;    
  fid=(*env)->GetFieldID(env, cls, "a", "[[Z");  
  if (fid==0) { return; }  aArray=(*env)->GetObjectField(env, jobj, fid);  
  len=(*env)->GetArrayLength(env, aArray);  
  a=(jboolean **) (*env)->GetBooleanArrayElements(env, aArray, 0);

Array lengths are correctly read separately. When I debug array in C it fails half-way or so:

  for (i=0;i<arows;i++)    
    for (j=0;j<acols;j++)       
      printf("a[%d][%d]=%u ",i,j,a<i>[j]);

Error: An unexpected exception has been detected in native code outside the VM.
Unexpected Signal : EXCEPTION_ACCESS_VIOLATION (0xc0000005) occurred at PC=0x189217B4

Is it the correct way to read multidimensional array? Or could it be the problem with jboolean type?

Kev