Can the following code leads to an endless loop ?

    public static Throwable getRootCause(Throwable t) {
        if (t == null)
            return t;
        Throwable cause = t.getCause();
        
        if (cause == null)
            return t;
        return getRootCause(cause);
    }

Answer:

Don't try this at home ;)

        Exception ex1 = new Exception("ex1");
        Exception ex2 = new Exception("ex2");
        ex1.initCause(ex2);
        ex2.initCause(ex1);
        getRootCause(ex1);