Memory Leak in Java

I have code similar to the code below.  It waits for an object to arrive on the object input stream that it receives over a TCP connection.
When an object of type DataMessage is received it will then put it on a queue to be handled by a thread that is started earlier in the startThread() method.  (getX and getY return strings and getZ returns and object)
ois is of type ObjectInputStream
the queue is declared as:
        this.queue = new ArrayBlockingQueue<DataMessage>(10000);
 
I am aware that this line: final DataMessage msg = resp;
seems unnecessary, it is! It is legacy code and should be deleted.  However I was wondering if that was what was leading to my memory leak, particularly the use of final in this context.
My profiler is telling me that my ObjectInputStream is taking a huge amount of memory.  The when I descend through the tree is shows ObjectInputStream$HandleTable, and below that java.lang.Object[] holding the largest amount of memeory.

What I would like to know is whether the final is potentially causing this problem or it is something else to do with how I have written my code.  Or it is not obvious from here.

Thanks for your time.

public boolean waitForServerResponse() throws SocketException, IOException, ClassNotFoundException {

        DataMessage resp = null;
        try{
            resp = (DataMessage) ois.readObject();
        } catch (EOFException e) {
            log.error("EOFException when receiving data - ignoring");
        }
        final DataMessage msg = resp;
        queue.offer(msg);
 
        return false;
    }

    private void startQueue() {
        
        new Thread(new Runnable() {
            public void run() {
                while(isReady()) {
                        try {
                            DataMessage msg = queue.take();
                            callback.newMsg(msg.getX(),msg.getY(),  msg.getZ());
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                }
            }
        }).start();
    }

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