Java Exception Stacktrace Not Printing

Question

I have the following code:

import org.apache.commons.lang.exception.ExceptionUtils;
public void myMethod() {
    try {
        // do something
    } catch (Exception e) {
        System.out.println(ExceptionUtils.getStackTrace(e)); // prints "java.lang.NullPointerException"
        System.out.println(ExceptionUtils.getFullStackTrace(e)); // prints "java.lang.NullPointerException"
        e.printStackTrace(); // prints "java.lang.NullPointerException"
    }
}

The output that I would like to see is a full stacktrace with line numbers and the hierarchy of classes that failed. For example,

Exception in thread "main" java.lang.NullPointerException
        at org.Test.myMethod(Test.java:674)
        at org.TestRunner.anotherMethod(TestRunner.java:505)
        at java.util.ArrayList(ArrayList.java:405)

This code is being run inside a larger app which also has log4j, but I'm hoping to be able to get the exception into a string so I can send it as an email to the java developers.

Does anyone have any ideas about how I can capture the full stack trace to a string? I can't use Thread.currentThread().getStackTrace() since this app runs on Java 4. What might be blocking the above code from printing the full stacktrace?

Answer 1

this is beacause java does some code optimiziation when run in server mode (java -server) to skip this. use -XX:-OmitStackTraceInFastThrow in java args see link below for details:

http://jawspeak.com/2010/05/26/hotspot-caused-exceptions-to-lose-their-stack-traces-in-production-and-the-fix/