java - 发生异常时显示完整的堆栈跟踪

Question

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Answer 1

这不是 Tomcat 的错，这是 Throwable.printStackTraceAsCause(PrintStream s, StackTraceElement[] causedTrace) 方法实现堆栈跟踪打印的方式。

 /**
     * 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);
    }

如果需要，您可以通过首先显示捕获元素的消息，然后显示 StackTraceElement(可通过调用Throwable.getStackTrace() 方法找到)。