code: public Throwable getException(String exceptionClassName)
  				 throws ExceptionInstantiationException
  {
  	if (exceptionClassName == null)
  	{
  		return null;
  	}
  	
  	Throwable ex = exceptionInfo.getException(exceptionClassName);
  	return ex;
  }
docs: Get a specific exception in a possible chain of exceptions.
  If there are multiple exceptions in the chain, the most recent
  one thrown will be returned.
  If the exceptions does not exist or no exceptions have been chained,
  null will be returned.
  
  @exception com.ibm.websphere.exception.ExceptionInstantiationException
  An exception occurred while trying to instantiate the exception object.
  If this exception is thrown, the relevant information can be retrieved
  by using the getExceptionInfo() method followed by recursively using
  the getPreviousExceptionInfo() method on the DistributedExceptionInfo
  object.
  
  @param String exceptionClassName the class name of the specific exception.
  @return java.lang.Throwable The specific exception in a chain of
  exceptions. If no exceptions have been chained, null will be returned.