code: public void removeAttribute(String name) {
          if (!_iSess.isValid())
              throw new IllegalStateException();
          if (_iSess != null) {
              _iSess.removeAttribute(name);
          }
      }
docs: /*
  (non-Javadoc)
  
  @see
  com.ibm.websphere.servlet.session.IBMApplicationSession#removeAttribute
  (java.lang.String)