How do you write a full stack trace to the log?

Question

I was catching an exception and trying to write the stack trace to the logs like this:

log.warn(e.getMessage());

But all it said was

null

So I changed it to

log.warn(e.toString());

And now it says only

java.lang.NullPointerException

How do I write the full stack trace to the log so I can see where this Exception is being generated in the app?

Answer 1

Usually:

log.warn("message", e);

But it depends on your logging framework too.

Answer 2

You can use

logger.log(Level.WARN, "logged exception", ex);

or

logger.warn("logged exception", ex);

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Resources :

• How to print the stack trace of an exception using Log4J (or Commons Logging)
• logging.apache.org - Category

Answer 3

Maybe you are looking for something like this: http://www.javapractices.com/topic/TopicAction.do?Id=78