Now I see that the problem may be in:
protected String getUnusedProxyClassName(ClassLoader classLoader,
String proxyClassName)
That in fact gets the classloader from
public ClassLoader getProxyClassLoader(final Class<?> forClass) {
final ClassLoader classLoader = forClass.getClassLoader();
if (classLoader == null) {
return Thread.currentThread().getContextClassLoader();
}
return classLoader;
}
Here I can see that if forClass is FacesArtifactProducer, classloader
is an URLClassLoader, not Tomee's classloader, that's why openwebbeans
thinks that the class does not exist. I think this is because how this
FacesArtifactProducer has been defined.
On Fri, Feb 20, 2026 at 3:40 PM Vicente Rossello <[email protected]>
wrote:
> Hi,
>
> I'm trying to migrate a big tomee app from 8.x to 10.1
>
> I think I found a bug, I don't know if the bug belongs to openwebbeans,
> myfaces or tomee integration layer.
>
> The reproducer is very simple:
>
> <!DOCTYPE html>
> <html lang="en"
> xmlns="http://www.w3.org/1999/xhtml";
> xmlns:f="jakarta.faces.core"
> xmlns:h="jakarta.faces.html"
> xmlns:c="jakarta.tags.core">
> <f:view>
> <h:body>
> <c:set var="example" value="example" scope="request"/>
> dsadsa
> #{param['someparam']}
> hello!!! #{example} adssda
> </h:body>
> </f:view>
> </html>
>
>
> Running this with tomee plus 10.1.4 throws an error:
>
> Caused by: java.lang.LinkageError: loader
> org.apache.tomee.catalina.TomEEWebappClassLoader @7d22f4f9 attempted
> duplicate class definition for
> org.apache.webbeans.custom.Map$$OwbNormalScopeProxy14900025290.
> (org.apache.webbeans.custom.Map$$OwbNormalScopeProxy14900025290 is in unnamed
> module of loader org.apache.tomee.catalina.TomEEWebappClassLoader @7d22f4f9,
> parent loader java.net.URLClassLoader @1176dcec)
> at java.base/java.lang.ClassLoader.defineClass1(Native Method)
> at
> java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:962)
>
>
> The thing is that the same proxy class name is created for
> #{param['someparam']} and for example bean (note that it has the
> scope="request" property). I don't really know how to look further.
>
> A full reproducer is in https://github.com/cocorossello/tomee-sample
>
> Do you have an idea?
>
>
> Best regards,
>
> Vicente
>
>
