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

问题

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?

回答1:

Usually:

log.warn("message", e);

But it depends on your logging framework too.

回答2:

You can use

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

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

Resources :

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

回答3:

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);

回答4:

If you using java8 you can do the following:

        LOGGER.error("Caught exception while methodX. Please investigate: " 
                + exception 
                + Arrays.asList(exception.getStackTrace())
                .stream()
                .map(Objects::toString)
                .collect(Collectors.joining("\n"))
        );

回答5:

In your exception method, the underlying String which contains the message is null.

The above answer, now struck out, still holds, except that e is not null, but the detailMessage private instance variable on the Throwable class is null, which is why e.getMessage() is the String null, but e.toString() (which calls underlying null detailMessage.toString) throws a NullPointerException.

回答6:

If you are using a Java version previous to 8, you can try this:

            LOGGER.error("Error al recuperar proveedores de la base de datos: " + 
            e + Arrays.asList(e.getStackTrace()).stream().map(new Function(){
                    @Override
                    public Object apply(Object t) {
                        return t.toString();
                    }
                }).collect(Collectors.joining("\n")));

来源：https://stackoverflow.com/questions/3717249/how-do-you-write-a-full-stack-trace-to-the-log

标签

java

stack-trace