I wonder if your variable saxParser is null.
Raymond Hooker (rhooker) wrote:
Pardon the basic question but I cannot see what the problem is. I was going through the SAX tutorials using Eclipse 3.0.2 and Java SDK 1.4.2_07. Anyhow the following code gets throws java.lang.NullPointerException:
String rulesFile =
fileDialog.getDirectory()+fileDialog.getFile();
// Use an instance of ourselves as the SAX event handler
DefaultHandler handler = new Echo();
// Use the default (non-validating) parser
SAXParserFactory factory =
SAXParserFactory.newInstance();
try {
// Set up output stream
out = new OutputStreamWriter(System.out, "UTF8");
// Parse the input File Filerules = new File(rulesFile);
SAXParser saxParser = factory.newSAXParser();
saxParser.parse( Filerules, handler );
<----Exception occurs here
} catch (Throwable t) {
t.printStackTrace();
}
I verified that by a breakpoint that the time of exception Filerules was File object that is not null, and handler is a Echo instance. Echo is class that extends DefaultHandler. Echo has a number of methods to handle events like startDocument and startElement. According to the JavaDoc, I don't believe that the parse method is supposed to throw a nullPointerException. BTW the actual stack trace is:
java.lang.NullPointerException at org.apache.crimson.parser.Parser2.parseInternal(Parser2.java:691) at org.apache.crimson.parser.Parser2.parse(Parser2.java:337) at org.apache.crimson.parser.XMLReaderImpl.parse(XMLReaderImpl.java:448) at javax.xml.parsers.SAXParser.parse(SAXParser.java:345) at javax.xml.parsers.SAXParser.parse(SAXParser.java:281) at Tree.rulesTree.main(rulesTree.java:103)
I have tried various file contents.
Ray
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