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https://issues.apache.org/jira/browse/JENA-328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13458553#comment-13458553
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Damian Steer commented on JENA-328:
-----------------------------------
Thanks for the report, and suggested fix.
I did look in to DatatypeFactory, since that is a pretty scary warning. My
reading is, first, DatatypeFactory is a bit of a mess. Second the idea is to do
something like:
String implClass = System.getProperty(
DatatypeFactory.DATATYPEFACTORY_PROPERTY,
DatatypeFactory.DATATYPEFACTORY_IMPLEMENTATION_CLASS);
which addresses the warning (I hope). Will make this change if it sounds ok.
> NodeValue makes assumptions about ClassLoader --- "nasty problem in OSGi
> environments"
> --------------------------------------------------------------------------------------
>
> Key: JENA-328
> URL: https://issues.apache.org/jira/browse/JENA-328
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ, Jena
> Affects Versions: Jena 2.7.3
> Environment: OSGi: Virgo Server for Apache Tomcat
> Reporter: Martin W.
> Priority: Minor
>
> com.hp.hpl.jena.sparql.expr.NodeValue.java: in lines 175ff:
> A new instance of a DatatypeFactory is created with .newInstance() --- there
> assumptions are made about the classloader. Such things make it difficult to
> use Jena in an OSGi-Environment like Virgo.
> Here's my fix: (get the correct classloader first and call newInstance with
> that classloader as parameter)
> {
> try {
> ClassLoader cl =
> com.hp.hpl.jena.sparql.expr.NodeValue.class.getClassLoader();
> xmlDatatypeFactory =
> DatatypeFactory.newInstance(DatatypeFactory.DATATYPEFACTORY_IMPLEMENTATION_CLASS,
> cl) ; }
> catch (DatatypeConfigurationException ex)
> { throw new ARQInternalErrorException("Can't create a javax.xml
> DatatypeFactory", ex) ; }
> }
> This fix did it for me. However, the JavaDoc for
> DatatypeFactory.DATATYPEFACTORY_IMPLEMENTATION_CLASS states "Users should not
> refer to this field; it is intended only to document a factory implementation
> detail. "
> NOTE: furthermore I added the original exception ex to:
> throw new ARQInternalErrorException("Can't create a javax.xml
> DatatypeFactory", ex)
> I think I have seen similar situations in the Jena source code several times
> --- I would like to see the original exception handed over when new ones are
> created whenever possible. Using Jena in an OSGi-Environment this would make
> my life a lot easier.... ;)
> Should i file separate bugs for these things in the future?
> For more information on OSGi and classloaders see also
> http://stackoverflow.com/questions/1043109/why-cant-jaxb-find-my-jaxb-index-when-running-inside-apache-felix
> Hanno Fietz wrote there "... quite nasty problem in OSGi environments when
> you're using libraries that aren't designed for OSGi and make assumptions
> about the classloader they get."
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