Removing setCause method. JDK 1.4 provided an initCause method and this method was to support both pre and post JDK 1.4 use cases. I don't see much of a reason to keep supporting Exceptions that have setCause as well as the inherited initCause. LANG-491
commons/proper/lang/trunk/src/java/org/apache/commons/lang3/exception/ExceptionUtils.java