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https://issues.apache.org/jira/browse/CAMEL-7708?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen updated CAMEL-7708:
-------------------------------
Labels: (was: BeanContainer CamelToDozerClassResolverAdapter
DozerClassLoader DozerTypeConverterLoader NPE class classloading dozer
singleton)
> Dozer class loading works only in last bundle
> ---------------------------------------------
>
> Key: CAMEL-7708
> URL: https://issues.apache.org/jira/browse/CAMEL-7708
> Project: Camel
> Issue Type: Bug
> Components: camel-dozer, osgi
> Affects Versions: 2.13.2
> Reporter: Jozef Tomek
>
> DozerTypeConverterLoader in it's init() method sets
> CamelToDozerClassResolverAdapter, properly resolving resources only within
> bundle being currently loaded, to Dozer's BeanContainer.getInstance().
> Because of Dozer using singletons, this DozerClassLoader implementation is
> then used for mappings done in context of all bundles. This effectively means
> that class loading will work only for the bundle (using dozer) that was
> started the last.
> Code of interest:
> {code:title=org.apache.camel.converter.dozer.DozerTypeConverterLoader|borderStyle=solid}
> 167 CamelToDozerClassResolverAdapter adapter = new
> CamelToDozerClassResolverAdapter(camelContext);
> 168 BeanContainer.getInstance().setClassLoader(adapter);
> {code}
> *Symptoms*
> For me the symptoms were NPE when Dozer's JAXBBeanFactory tried to create
> mapping-target class instance by loading ObjectFactory class and calling the
> appropriate create method. Installed CamelToDozerClassResolverAdapter was
> unable to load ObjectFactory residing in different bundle (started not as the
> last one), which immediatelly caused NPE.
> However I would say it has to fail even when default bean creation method
> instead of JAXBBeanFactory is used.
> *Workaround*
> Since I had to deliver working module that day, my quick and not very nice
> workaround was to extend DozerTypeConverterLoader, override its' init()
> method and after calling super.init() replace the loader set on
> BeanContainer.getInstance() with my custom DozerClassLoader.
> This custom loader knows what bundle it was created for, what loader was set
> on BeanContainer.getInstance() before super.init() changed it \[one hopefully
> working for all bundles that are already started\], and (new) one that
> super.init() changed it to \[one working for this new bundle\].
> This custom loader then checks what bundle context is it called from using
> ugly
> {code}
> ((BundleDelegatingClassLoader)
> Thread.currentThread().getContextClassLoader()).getBundle()
> {code}
> approach. Then it delegates call to proper dozer class loader - either one
> for that bundle or fallback.
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