Why is My Java NullPointerException Missing a Stack Trace?

NullPointerException in Java without StackTrace

When encountering a NullPointerException in Java code, it's common to log the stack trace for debugging purposes. However, sometimes the stack trace might be empty, leaving developers puzzled.

One possible explanation is that you're using the HotSpot JVM, which is known for its optimization features. To prioritize performance, the HotSpot JVM may suppress stack traces for frequently occurring exceptions. To retrieve these stack traces, add the following JVM option:

-XX:-OmitStackTraceInFastThrow

This optimization, implemented by the OmitStackTraceInFastThrow variable in the HotSpot JVM's graphKit.cpp file, attempts to prevent logging repetitive stack traces for exceptions that occur often. By disabling this optimization, you can restore the stack trace output, enabling you to pinpoint the source of the NullPointerException.

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