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Generating a stack trace

 
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Generating a stack trace, Who called me?
NickDMax
26 Jun, 2008 - 07:59 PM
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Does anyone know how to get the caller of a function?

For example log4j's logger will tell you on what line of the code a logging call was made. I am trying to add this functionality to our exception handling framework so we don't have to pass in out class name and method name.

I am off to see if I can spot how log4j does it.
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pbl
RE: Generating A Stack Trace
26 Jun, 2008 - 08:08 PM
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Thread.dumpStack();

Too easy ... what more do you want NickdMax ? I guess I don't understand your question.
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NickDMax
RE: Generating A Stack Trace
26 Jun, 2008 - 08:12 PM
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I think what I was looking for was more:

(new Throwable()).getStackTrace();

I need to get the data into a useble format. I don't want it printed. I don't want to have to capture the System.out and see if I can find it.
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pbl
RE: Generating A Stack Trace
26 Jun, 2008 - 08:15 PM
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StackTraceElement[] ste = Thread.getStackTrace();

probably called by dumpStack()
that System.out.println() the elements in the array

StackTraceElement has methods:
- getMethodName()
- getLineNumber();
- ...

This post has been edited by pbl: 26 Jun, 2008 - 08:20 PM
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NickDMax
RE: Generating A Stack Trace
26 Jun, 2008 - 08:19 PM
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? odd I don't see a getStackTrace() function on thread... (that was what I thought one did originally -- if I had kept my mouth shut about that I would not be doing this) Is that in the later versions of Java?
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pbl
RE: Generating A Stack Trace
26 Jun, 2008 - 08:26 PM
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QUOTE(NickDMax @ 26 Jun, 2008 - 09:19 PM) *

? odd I don't see a getStackTrace() function on thread... (that was what I thought one did originally -- if I had kept my mouth shut about that I would not be doing this) Is that in the later versions of Java?

It is on 1.5 for sure... that is what I use


QUOTE(pbl @ 26 Jun, 2008 - 09:22 PM) *

QUOTE(NickDMax @ 26 Jun, 2008 - 09:19 PM) *

? odd I don't see a getStackTrace() function on thread... (that was what I thought one did originally -- if I had kept my mouth shut about that I would not be doing this) Is that in the later versions of Java?

It is on 1.5 for sure... that is what I use

Just checked... it is not in 1.4.2
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NickDMax
RE: Generating A Stack Trace
26 Jun, 2008 - 08:32 PM
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Yea, much to my dismay, "Enterprise Java == Java 1.4".

Oh they talk about how the new EJB 3.0 version of the product(s) will be awesome... but I have yet to work on any thing other than 1.4.

This project actually started out on 1.5, but there were integration problems with WAS 6.1 and so we had to roll back to WAS 6.0.2 and thus Java 1.4

sad.gif I think I found my answer. I knew there had to be a way to do it, but my architect thought you had to use a native method.
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pbl
RE: Generating A Stack Trace
26 Jun, 2008 - 08:35 PM
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QUOTE(NickDMax @ 26 Jun, 2008 - 09:32 PM) *

This project actually started out on 1.5, but there were integration problems with WAS 6.1 and so we had to roll back to WAS 6.0.2 and thus Java 1.4


I would have a look at the source code of 1.4.2 dumpStack() method

which calls Throwable.dumpStack()
which has a class StackTraceElement (as far as the comment says since 1.4)
which has a PRIVATE method getStrackTraceElement()

This post has been edited by pbl: 26 Jun, 2008 - 08:49 PM
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NickDMax
RE: Generating A Stack Trace
26 Jun, 2008 - 08:45 PM
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Here is what I came up with:
CODE
public class StackTraceUtil {
    public static String whoCalledMe() {
        String retVal = "";
        java.lang.StackTraceElement[] trace = (new Throwable()).getStackTrace();
        if (trace.length >= 2) {
            retVal = trace[1].getClassName() + "." +
                trace[1].getMethodName()+"()";
        }
        
        return retVal;
    }
    
    public static void main(String[] args) {
        System.out.println(StackTraceUtil.whoCalledMe());
    }

}


Why did we need this: Exception handling in concurrent environments. We needed a centralized place to send exceptions so that they did not bubble up and kill vital threads. So there comes a point where you can't just "throw" the exception -- it has to be caught and logged or whatever. If a thread has to be killed it should be able to shutdown gracefully and not just die. etc.
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