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Future task of ExecutorService not truly cancelling
ExecutorService taskExecutor = Executors.newCachedThreadPool();
private static Map <String, Future<Object>> results = new HashMap <String, Future<Object>>();

Future<Object> future = taskExecutor.submit(new MyProcessor(uid));
results.put(uid, future);

public static synchronized boolean cancelThread(String uid) {
    Future<Object> future = results.get(uid);
    boolean success = false;
    if (future != null) {
        success = (future.isDone() ? true : future.cancel(true));
        if (success)
            results.remove(uid);
    }
    return success;
}