Jetty Websocket Client WebSocketAdapter - problems with byte array memory usage

Question

I am using the latest Jetty websocket client and I have a simple client application to receive a video stream from a server. The stream is sent as a server push using approx 1 MB binary chunks. As the client socket I am just extending the Jetty's WebSocketAdapter class and the relevant part in my socket to receive the server push is:

@Override
public void onWebSocketBinary(final byte[] data, final int offset, final int length) {
    dataCount += data.length;
}

As the client code is used for load testing, I am not processing the data any further, I am just expecting the data just being thrown away by the code. Also, to simulate several clients, I am creating several instances of WebSocketClient and the associated socket.

When running the clients, the java process memory usage is continuously increasing and eventually leads to an OutOfMemory situation. I tried to analyze heap dumps and I see the following:

Heap dump

So my question is, why the memory used by the byte arrays is not cleaned up? The memory consumption just keeps growing and growing without bounds. Is there anything I can do to clean up the arrays myself in my code?