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<TITLE>Handling Errors While Parsing an XML File (Java Developers Almanac Example)
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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"><b>e385</b> The Quintessential Logging Program</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> <!-- invalid XML -->
<root>
<element>
</root>
</pre>
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<b>Related Examples</b></font></td>
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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
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e511. <a class="eglink" href="CreateDom.html?l=rel">
Creating an Empty DOM Document
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e512. <a class="eglink" href="Str2Dom.html?l=rel">
Converting an XML Fragment into a DOM Fragment
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See also:
<a class="eglink" href="/egs/javax.xml.parsers/pkg.html?l=rel#DOM%20Parsing%20Options">
DOM Parsing Options
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<a class="eglink" href="/egs/javax.xml.parsers/pkg.html?l=rel#SAX">
SAX
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