[ http://issues.apache.org/jira/browse/DIGESTER-109?page=comments#action_12443997 ] Simon Kitching commented on DIGESTER-109: -----------------------------------------
Good point Henri. I had assumed that the NullPointerException Anna was reporting in FromXmlRuleSet was not from the actual line that was marked changed, but later on when dtdURL was being used or similar due to the resource only being locatable via the modified code - which is the sort of thing that odd J2EE configurations can experience. The second change just had me puzzled, but I was delaying comment until I had checked the implementation of Digester.getClassLoader(). However it does appear that Anna is experiencing getClass().getClassLoader() returning null; that explains both changes as Digester.getClassLoader would return null in that case. But that behaviour, as you say, is very odd indeed. This only occurs AFAIK if Digester.class were being loaded via the bootstrap classloader, or by the System classloader in a 1.1 (or earlier) JVM (the distinction between bootclassloader and system classloader was only introduced in 1.2). Loading a non-core library via the bootstrap classloader would be very weird indeed. Anna, you aren't using Digester in some kind of embedded system or antique JVM are you? And you're not putting commons-digester.jar into the install directory of your JVM for some reason? If not, can you please look into why you are getting a null value from Digester.getClass().getClassLoader() because I can't see how it's possible... Regards, Simon > FromXmlRuleSet and SetNextRule classloader issue > --------------------------------------------------- > > Key: DIGESTER-109 > URL: http://issues.apache.org/jira/browse/DIGESTER-109 > Project: Commons Digester > Issue Type: Bug > Reporter: Anna Komaristaia > > When I start the application in Unix, there are 2 classes cause the problem: > 1) The NullPointerException in "FromXmlRuleSet " class in the method > "addRuleInstances(Digester, String)"; > 2) The NullPointerException in "SetNextRule" class in the method "end()"; > Temporary solution > --------------------------- > I recompiled the commons-digester jar with the next changes and it's working > fine in PC and Unix: > Changes in the "FromXmlRuleSet " class > > 1) public static final String DIGESTER_DTD_PATH = "digester-rules.dtd"; > 2) in the method "addRuleInstances" > the line > URL dtdURL = > getClass().getClassLoader().getResource(DIGESTER_DTD_PATH); > > changed by > > URL dtdURL = this.getClass().getResource(DIGESTER_DTD_PATH); > Changes In the "SetNextRule" class > the line > paramTypes[0] = digester.getClassLoader().loadClass( > paramType); > changed by > if( digester.getClassLoader() == null ) > paramTypes[0] = Class.forName(paramType); > else > paramTypes[0] = digester.getClassLoader().loadClass( > paramType); > Thanks, > //Anna -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
