Getting stacktrace in logger

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log4j throwable

I am using log4j to log my exceptions. I want to log whatever I get in e.printStackTrace(); My code looks like this:

try {

} catch(Exception e) {
    log.error("Exception is:::" + e);
}

But the content I get logged looks like this:

2012-02-02 12:47:03,227 ERROR [com.api.bg.sample] - Exception in unTech:::[Ljava.lang.StackTraceElement;@6ed322
2012-02-02 12:47:03,309 ERROR [com.api.bg.sample] - Exception is :::java.lang.IndexOutOfBoundsException: Index: 0, Size: 0

But the content I expect is:

java.io.IOException: Not in GZIP format
at java.util.zip.GZIPInputStream.readHeader(Unknown Source)
at java.util.zip.GZIPInputStream.<init>(Unknown Source)
at java.util.zip.GZIPInputStream.<init>(Unknown Source)
at com.api.bg.sample.unGZIP(sample.java:191)
at com.api.bg.sample.main(sample.java:69)

I tried e.getMessage(), e.getStackTrace(); however I don't get the full stacktrace. Any suggestions?


You have to use the two argument form

log.error("my logging message", exception)

See http://www.devdaily.com/blog/post/java/how-print-exception-stack-trace-using-log4j-commons for more details.

How do I log a stacktrace using java's Logger class, You need to understand that void is actually nothingness . You cannot convert what is nothing. You might end up printing void as a string, but  The StackTrace property is overridden in classes that require control over the stack trace content or format. By default, the stack trace is captured immediately before an exception object is thrown. Use StackTrace to get stack trace information when no exception is being thrown.


Change your logging statement to:

log.error("Exception is: ", e);

How to print an exception stack trace using Log4J (or Commons , Printing the stack trace of a Log4J exception seems to be something of a trick question. In reviewing Java code from different developers at  The short answer is that all you have to do to print the stack trace of an exception using Java and Log4J (or the Apache Commons Logging project) is this: log.error("Your description here", exception); where exception is your Java Exception object.


It is actualy log4j that prevents the printing of the fulltime stacktrace. You should however set the exception as a second parameter for the error method.

Scala/Java: How to convert a stack trace to a string for printing with a , In Scala I used to get the text from a stack trace and then log it like this: // this works, but it's not too useful/readable logger.error(exception. To get the stack trace of all threads you can either use the jstack utility, JConsole or send a kill -quit signal (on a Posix operating system). However, if you want to do this programmatically you could try using ThreadMXBean:


log.log(LEVEL.ERROR,e.getMessage(),e);

Converting a Stack Trace to a String in Java, Learn how to convert a Stack Trace to a String using core Java method or When dealing with exceptions in Java, we're frequently logging or simply Using this class, getting the stack trace as a String from an Exception is  Logging the full stacktrace. A best practice is to have a logger set up for your module. It will know the name of the module and be able to change levels (among other attributes, such as handlers) import logging logging.basicConfig(level=logging.DEBUG) logger = logging.getLogger(__name__) And we can use this logger to get the error:


JavaLogger, printStackTrace() in logger methods. try{ // exception code here } Default. I know one workaround/easy way - get the PrintStackTrace in String. A “pre-processed” stack trace entry is a 4-tuple (filename, line number, function name*, text) representing the information that is usually printed for a stack trace. The text is a string with leading and trailing whitespace stripped; if the source is not available it is None. traceback.extract_stack ([f [, limit]]) ¶


Java Stack Trace: Understanding It and Using It to Debug, What is a Java stack trace and how can you use it? It's like getting a compass, a map, and a first-class airplane ticket handed to you all at once! The good news is that most loggers, including Log4j and Logback, will write  Before 5.3.6, the only values recognized are TRUE or FALSE, which are the same as setting or not setting the DEBUG_BACKTRACE_PROVIDE_OBJECT option respectively. limit. As of 5.4.0, this parameter can be used to limit the number of stack frames returned. By default (limit=0) it returns all stack frames.


Java error-handling: Throwable.printStackTrace() should not be , prints a Throwable and its stack trace to some stream. By default that stream System.Err , which could inadvertently expose sensitive information. Loggers should  This article explains how to log the current call stack by using the StackFrame and StackTrace classes of the .NET Framework. Download binary files - 5.79 KB Download source files - 12.1 KB