CODEWITHSUNDEEP
javaexceptionlogging
Doflamingo
Doflamingo

Reputation: 217

How to put the stack trace error in a logger

I need to put the stack trace from exeception in a log, so I do:

final static Logger logger = LoggerFactory.getLogger(MyClass.class);

try{
    ..
}catch(NumberFormatException number_format){
    logger.error(number_format.exception.getStackTrace().toString());
}

But it doesn't work because it print me Ljava.lang.StackTraceElement;@775a19fe .Anyone can help me?

Upvotes: 1

Views: 2706

Answers (4)

Kevin Bruccoleri
Kevin Bruccoleri

Reputation: 364

The Apache Commons Lang library can provide a readable stack trace from a given exception, specifically ExceptionUtils.

try {
    ..
}
catch(NumberFormatException e) {
    logger.error(ExceptionUtils.getStackTrace(e));
}

Upvotes: 0

Coder-Man
Coder-Man

Reputation: 2531

getStackTrace() returns StackTraceElement[] for which the toString() function is not overridden so you get what you have in the java.lang.Object class:

public String toString() {
    return getClass().getName() + "@" + Integer.toHexString(hashCode());
}

That's why you get this message. You should use the getMessage() function of the Exception class instead.

If you want the stacktrace message, you can get it like so:

Arrays.stream(e.getStackTrace()).map(String::valueOf).collect(Collectors.joining("\n")) and then output it.

Upvotes: 1

SeverityOne
SeverityOne

Reputation: 2691

It depends a bit on your logging library, but usually you do the following:

logger.error("Something went wrong", exception);

Upvotes: 0

davidxxx
davidxxx

Reputation: 131326

To log a stracktrace with a logger, use the overloaded method of the logger that suits to :

Logger.error(String msg, Throwable t);

Slf4j, Log4j, LogBack, common-logging... all of these distinguish Logger.error(String msg) to log an error message and Logger.error(String msg, Throwable t) to log both an error message and the stracktrace of a Throwable.

So write something like :

final static Logger logger = LoggerFactory.getLogger(MyClass.class);

try{
    ..
}
catch(NumberFormatException e){
    logger.error("issue in ...", e);
}

Upvotes: 2

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