Web Reference: Nov 24, 2013 · IllegalStateException signals that method has been invoked at the wrong time. In the example below we can see that the remove() method is mutating an element while its iterator is in a loop (an illegal call), which Java catches and throws: Mar 25, 2026 · In the Java programming language, exceptions play a crucial role in handling errors and unexpected situations. One such exception is the `IllegalStateException`. This exception is a runtime exception that is thrown to indicate that a method has been invoked at an illegal or inappropriate time. Jul 23, 2025 · In order to avoid java.lang.IllegalStateException in Java main Thread we must ensure that any method in our code cannot be called at an illegal or an inappropriate time.
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