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Are stack traces created when a Java exception is thrown?

This assumes that we are not calling the .printstacktrace method - just throw and catch.

We consider this for some performance bottlenecks.

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java performance exception exception-handling jvm
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4 answers

Yes. Throwable () constructors call fillInStackTrace (). (At least in Sun / Oracle JDK 6 for Windows.)

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Stacktrace is captured when an exception is thrown.

If you really don't care about stacktrace, you can throw an exception once and throw it several times, but it looks like a hack and can be misleading.

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A Throwable object grabs the current stack (using native code) if it will be printed or not. This is the reason why Exceptions should not be (ab) used for control flow.

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it is not created lazily when the printStackTrace () method is called

Neal Gafter (former Sun engineer on the Java team) mentioned the effectiveness of exceptions here :

The most expensive part of an exception is handling far - stack capture trace when creating an exception

Also see this question .

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