code: public String getThrowsClause()
      {
          if ( _methodDecl == null || _methodDecl.getThrownTypes() == null )
              return "";
          
          Collection<ReferenceType> thrownTypes = _methodDecl.getThrownTypes();
          if (thrownTypes.size() == 0)
              return "";
  
          StringBuffer sb = new StringBuffer("throws ");
          int i = 0;
          for (ReferenceType exceptType : thrownTypes)
          {
              if (i++ != 0)
                  sb.append(", ");
              sb.append(exceptType.toString());
          }
          return sb.toString();
      }
docs: Returns the throws clause of the operation