Web Reference: May 8, 2021 · I've built a REST API in Spring Boot which works perfectly when ran from main and tested with Postman. Jul 23, 2025 · How to solve this error? 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. 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.
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