How to Diagnose a Null Exception Message in Java

Date: 2025-02-12

Java exceptions sometimes have null messages, hindering debugging. This can occur when exceptions are thrown without a message, re-thrown without preserving the original message, or due to poorly implemented custom exceptions. While the message is absent, the stack trace offers crucial information about the error's origin. Using getCause() can retrieve details from wrapped exceptions. Best practices include always providing descriptive messages when throwing exceptions and correctly handling re-thrown exceptions to maintain informative error messages. Leveraging stack traces is key to effective debugging even in the absence of an exception message.

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