seterror.html

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<TITLE>Handling Errors While Parsing an XML File
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  <h3>
    e513.  
    Handling Errors While Parsing an XML File</h3>

This example installs an error handler to a parser.  The error handler
logs error messages to a logger
(see <a href="../java.util.logging/BasicLogging.html" class="eglink"><font size="-1"><b>e385</b> The Quintessential Logging Program</font></a>).


<pre>
    // Create a builder
    DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
    
    // Set an error listener
    builder.setErrorHandler(new MyErrorHandler());
    
    // Use the builder to parse the file
    Document doc = builder.parse(new File(<font color="#0066ff"><i>"infilename.xml"</i></font>));
    } catch (SAXException e) {
        // A parsing error occurred; the xml input is not valid.
        // This exception can still be thrown, even if an error handler is installed.
    } catch (ParserConfigurationException e) {
    } catch (IOException e) {
    }
    
    // This error handler uses a Logger to log error messages
    class MyErrorHandler implements ErrorHandler {
        //  This method is called in the event of a recoverable error
        public void error(SAXParseException e) {
            log(Level.SEVERE, <font color="#0066ff"><i>"Error"</i></font>, e);
        }
    
        //  This method is called in the event of a non-recoverable error
        public void fatalError(SAXParseException e) {
            log(Level.SEVERE, <font color="#0066ff"><i>"Fatal Error"</i></font>, e);
        }
    
        //  This method is called in the event of a warning
        public void warning(SAXParseException e) {
            log(Level.WARNING, <font color="#0066ff"><i>"Warning"</i></font>, e);
        }
    
        // Get logger to log errors
        private Logger logger = Logger.getLogger(<font color="#0066ff"><i>"com.mycompany"</i></font>);
    
        // Dump a log record to a logger
        private void log(Level level, String message, SAXParseException e) {
            // Get details
            int line = e.getLineNumber();
            int col = e.getColumnNumber();
            String publicId = e.getPublicId();
            String systemId = e.getSystemId();
    
            // Append details to message
            message = message + ": " + e.getMessage() + ": line="
                + line + ", col=" + col + ", PUBLIC="
                + publicId + ", SYSTEM=" + systemId;
    
            // Log the message
            logger.log(level, message);
        }
    }
</pre>

Given the following input file, <code>MyErrorHandler.fatalError()</code> is
called and <code>parse()</code> throws a <code>SAXParseException</code> as well.


<pre>
    &lt;!-- invalid XML --&gt;
    &lt;root&gt;
       &lt;element&gt;
    &lt;/root&gt;
</pre>
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            &nbsp;Related Examples
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e510. <a class="eglink" href="BasicDom.html?l=rel">
    The Quintessential Program to Create a DOM Document from an XML File
</a>
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e511. <a class="eglink" href="CreateDom.html?l=rel">
    Creating an Empty DOM Document
</a>
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e512. <a class="eglink" href="Str2Dom.html?l=rel">
    Converting an XML Fragment into a DOM Fragment
</a>
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<br>
        See also: 
<a class="eglink" href="/egs/javax.xml.parsers/pkg.html?l=rel#DOM%20Parsing%20Options">
    DOM Parsing Options
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/javax.xml.parsers/pkg.html?l=rel#SAX">
    SAX
</a>&nbsp;&nbsp;

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