How to log the full stacktrace?

Question

I'm using log4j to log unhandled exceptions. But how can I log the stacktrace?

I tried the following:

Logger.getRootLogger().fatal(e);

Result: 2013-11-05 14:25:07,078 FATAL root: java.lang.NullPointerException BUT no stacktrace! Why?

Answer 1

尝试：

Logger.getRootLogger().fatal(e, e);

Answer 2

field element

private static final Logger LOGGER = LogFactory.getLogger(YourClazz.class);

in your methods, simply log e

LOGGER.error("There was an error {}",e);

and it will print the full stacktrace