This means that all the threads in the thread pool have been used up and there are no more available threads to handle incoming requests or tasks This can happen when there is a high volume of request

Another option is to implement a queueing system to temporarily store incoming requests or tasks until a thread becomes available in the thread pool. This can help prevent thread exhaustion and ensure that all requests or tasks are eventually processed. It is also important to monitor the performance of the thread pool and adjust its size accordingly to ensure optimal performance.