Question

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howto increase lines of java stack trace dump?

I’m writing a Java Application for tomcat. whenever an Exception is being thrown I get the name of the Exception and the stack trace and in the end if it’s a long trace I get
... X more.

how can I configure tomcat to show a full stack trace ?

thank you!

Answer 1

That’s not Tomcat’s fault, it’s the way the Throwable.printStackTraceAsCause(PrintStream s, StackTraceElement[] causedTrace) method implements the printing of stacktraces.

 /**
     * Print our stack trace as a cause for the specified stack trace.
     */
    private void printStackTraceAsCause(PrintStream s,
                                        StackTraceElement[] causedTrace)
    {
        // assert Thread.holdsLock(s);

        // Compute number of frames in common between this and caused
        StackTraceElement[] trace = getOurStackTrace();
        int m = trace.length-1, n = causedTrace.length-1;
        while (m >= 0 && n >=0 && trace[m].equals(causedTrace[n])) {
            m--; n--;
        }
        int framesInCommon = trace.length - 1 - m;

        s.println("Caused by: " + this);
        for (int i=0; i <= m; i++)
            s.println("\tat " + trace[i]);
        if (framesInCommon != 0)
            s.println("\t... " + framesInCommon + " more");

        // Recurse if we have a cause
        Throwable ourCause = getCause();
        if (ourCause != null)
            ourCause.printStackTraceAsCause(s, trace);
    }

If you want, you can print your stacktraces yourself in a log file (or response.getOutputStream()) by getting first displaying the message of the caught element and then displaying the array element of StackTraceElement (which can be found by calling Throwable.getStackTrace() method).