SAXParseException和UnmarshalException

Question

我正在尝试处理这些异常。例如，当用户加载一个无效的XML文件时，就会抛出SAXParseException，并要求他加载另一个文件。

看起来"catch“在这里行不通。

下面是我的代码：

public void parseXML_FROM_file (File xml_file)
    {
        try {



           JAXBContext jc = JAXBContext.newInstance ("generated");

           //Creating an Unmarshaller.
           Unmarshaller u = jc.createUnmarshaller ();

           //USING FILE APPROACH
           System.out.println("Using FILE approach:");
           JAXBElement element = (JAXBElement) u.unmarshal(xml_file);
           TEST_Class mainTest = (TEST_Class) element.getValue ();



       } catch (JAXBException  e) 
       {
           e.printStackTrace ();

       }catch (SAXParseException e)

           //do something

       }catch (UnmarshalException e)

          //do something
       }

   }

甚至，这是行不通的

catch (JAXBException,SAXParseException,UnmarshalException e)
{
  //do something
}

@don robi

这是我得到的：

Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
    The type JAXBException is not generic; it cannot be parameterized with arguments <SAXParseException, UnmarshalException>
    Syntax error on token ",", < expected
    Syntax error, insert ">" to complete ReferenceType1

    at XML_Parser.parseXML_FROM_file(XML_Parser.java:64)
    at Main_Class.main(Main_Class.java:13)

Answer 1

异常表示这是一个编译异常。一旦修复了XML_parser类中的错误，您就应该得到预期的JAXB行为。

Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
    The type JAXBException is not generic; it cannot be parameterized with arguments <SAXParseException, UnmarshalException>
    Syntax error on token ",", < expected
    Syntax error, insert ">" to complete ReferenceType1

    at XML_Parser.parseXML_FROM_file(XML_Parser.java:64)
    at Main_Class.main(Main_Class.java:13)