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

Answer 1

Using log4j this is done with:

logger.error("An error occurred", exception);

The first argument is a message to be displayed, the second is the exception (throwable) whose stacktrace is logged.

Another option is commons-logging, where it's the same:

log.error("Message", exception);

With java.util.logging this can be done via:

logger.log(Level.SEVERE, "Message", exception);