Review

class ExceptionUtils {
    /**
     * <p>Creates a compact stack trace for the root cause of the supplied
     * <code>Throwable</code>.</p>
     *
     * <p>The output of this method is consistent across JDK versions.
     * It consists of the root exception followed by each of its wrapping
     * exceptions separated by '[wrapped]'. Note that this is the opposite
     * order to the JDK1.4 display.</p>
     *
     * @param throwable  the throwable to examine, may be null
     * @return an array of stack trace frames, never null
     * @since 2.0
     */
    public static String[] getRootCauseStackTrace(Throwable throwable) {
        if (throwable == null) {
            return ArrayUtils.EMPTY_STRING_ARRAY;
        }
        Throwable throwables[] = getThrowables(throwable);
        int count = throwables.length;
        ArrayList frames = new ArrayList();
        List nextTrace = getStackFrameList(throwables[count - 1]);
        for (int i = count; --i >= 0;) {
            List trace = nextTrace;
            if (i != 0) {
                nextTrace = getStackFrameList(throwables[i - 1]);
                removeCommonFrames(trace, nextTrace);
            }
            if (i == count - 1) {
                frames.add(throwables[i].toString());
            } else {
                frames.add(WRAPPED_MARKER + throwables[i].toString());
            }
            for (int j = 0; j < trace.size(); j++) {
                frames.add(trace.get(j));
            }
        }
        return (String[]) frames.toArray(new String[0]);
    }

}