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https://issues.apache.org/jira/browse/XMLBEANS-567?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17537762#comment-17537762
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Peter Keller commented on XMLBEANS-567:
---------------------------------------

I have looked at some specific commits, and what I have found so far fits in 
with [~pj.fanning] 's comment above:
{quote}But I can say for sure that the described problems are the result of 
replacing JAM with JavaParser. This happened in XMLBEANS-539 (see comment).
{quote}
Building from the commit previous to the one where XMLBEANS-539 was applied 
[(522aeb6)|https://github.com/apache/xmlbeans/commit/522aeb623822fa43116c780b763dec71f4f15158]
 produces a build that handles interface extensions correctly. I can't build 
the next few commits (some requirement for Apache commons logging during the 
build process that I haven't figured out how to provide yet). The earliest 
commit that I have succeed in building from after 522aeb6 is 
[f4bde2c|https://github.com/apache/xmlbeans/commit/f4bde2c9967bb04a5d00629cc88d823184d98463c]
 and this build cannot handle interface extensions.

If anyone is looking at this actively, I am in a position to rapidly test 
possible solutions and would be happy to help move things forwards.

> Problems with XMLBeans Extension Interfaces Feature
> ---------------------------------------------------
>
>                 Key: XMLBEANS-567
>                 URL: https://issues.apache.org/jira/browse/XMLBEANS-567
>             Project: XMLBeans
>          Issue Type: Task
>    Affects Versions: Version 5.0.0
>            Reporter: Dmitry Lastochkin
>            Priority: Major
>         Attachments: xmlbeans-ie-tryout.tar
>
>
> Hello! In our project we are using [XMLBeans Extension Interfaces 
> Feature|https://cwiki.apache.org/confluence/display/XMLBEANS/ExtensionInterfacesFeature].
>  When we compile the TypeSystem (using {{SchemaTypeSystemCompiler.compile}}), 
> we add the jar with our extension classes to classpath parameter. In XMLBeans 
> 2.4 it works perfectly. But when we updated to XMLBeans 5.0.0, we encountered 
> the following error during an extensions validation:
> {code}
> Interface 'SomeInterface' not found."
> {code}
> As far as I understand, this is because 
> {{org.apache.xmlbeans.impl.config.Parser}} does not search classes in 
> classpath (only in files). 
> When we added the sources of the extension interface to the parameters, 
> TypeSystem compiled successfuly. But then we ran into another problem. When 
> XMLBeans generates java files from XSD, it uses simple class names (instead 
> of fully qualified names as it was in XMLBeans 2.4.0) for the classes that 
> are used in methods of the extension interface (like parameters types or 
> return types). And therefore the geneted files cannot be compiled if the 
> extension classes are in a different package.
> Are those changes (ingorning classpath when searching for extenstions  and 
> using simple names for extenstion classes in code generation instead of fully 
> qualified names) were made intentionally? Such limitations are hard to work 
> around, making an upgrade from older XMLBeans version very complicated.



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