core/src/main/java/org/apache/commons/jelly/JellyException.java [156:170]:
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    @Override
    public void printStackTrace(PrintWriter s) { 
        synchronized (s) {
            super.printStackTrace(s);
            if  (cause != null) {
                s.println("Root cause");
                cause.printStackTrace(s);
            }
        }
    }

    /** 
     * Sets the column number of the tag 
     */
    @Override
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jelly-tags/junit/src/main/java/org/apache/commons/jelly/tags/junit/JellyAssertionFailedError.java [146:157]:
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    @Override
    public void printStackTrace(PrintWriter s) {
        synchronized (s) {
            super.printStackTrace(s);
            if  (cause != null) {
                s.println("Root cause");
                cause.printStackTrace(s);
            }
        }
    }

    @Override
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