I assume you understand what is Direct ByteBuffer. I was trying to retrieve byte[] from Direct ByteBuffer
ByteBuffer buffer = ByteBuffer.allocateDirect(10000);
.....
.....
buffer.flip();
byte[] data = buffer.array();
and I was getting this error
Exception in thread "main" java.lang.UnsupportedOperationException
at java.nio.ByteBuffer.array(ByteBuffer.java:959)
I was able to solve this as follows
ByteBuffer buffer = ByteBuffer.allocateDirect(10000);
.....
.....
buffer.flip();
byte[] data = new byte[buffer.remaining()];
buffer.get(data);
// Here you hava data populated inside data[] array
String token = new String(data);