What happens to the execution flow if a deadlock occurs?

In Java, a deadlock occurs when threads involved in the deadlock wait forever for resources held by each other and cannot continue execution. This causes these threads to 'hang' and not terminate, which can lead to the entire program or part of its functionality becoming unresponsive.

A deadlock happens when two or more threads acquire resources in different orders and each waits for a resource held by another thread.

Example: Thread A has acquired resource 1 and waits for resource 2, while Thread B has acquired resource 2 and waits for resource 1 — both are permanently blocked.