[ http://issues.apache.org/jira/browse/DIGESTER-109?page=all ]
Simon Kitching updated DIGESTER-109:
------------------------------------
Summary: FromXmlRuleSet and SetNextRule classloader issue (was:
FromXmlRuleSet and SetNextRule classes not working in Unix enviroment)
Hi Anna,
Thanks very much for reporting this issue.
I expect this isn't a "unix" issue specifically; I use Digester extensively on
AIX and Linux and don't have this problem. In addition, I've not seen any
classloader behaviour differences between unix and windows; anything like that
would be a great surprise as Java is cross-platform. I've therefore edited the
title of this bugreport.
It's obviously a real problem, but is more likely triggered by the way your
classloader environment is structured, eg running in a J2EE container when
"parent-first" classloading is selected, and Digester is deployed in a shared
dir of the container or something similar.
Unfortunately, I'm concerned that your posted patch could break other users
that have their J2EE container classloading set up in other ways; deciding what
the correct change to make is will be tricky.
By the way, the xmlrules module you're using has very little support; I'm the
only regular Digester maintainer and I don't use it. If you can change to using
the Digester API directly I can commit a fix for this quicker than for an
xmlrules problem. However I will try to come up with a patch for you to test.
Getting a fix into trunk will definitely need your help, as obviously I can't
duplicate this bug on my local machine.
Of course there's nothing wrong with you continuing to use your customised
Digester version that works for you.
Cheers,
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
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