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https://issues.apache.org/jira/browse/XMLBEANS-612?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dominik Stadler updated XMLBEANS-612:
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Summary: Adjust Class loading to allow using XMLBeans on Android (was:
Adjust Class loading for using XMLBeans on Android)
> Adjust Class loading to allow using XMLBeans on Android
> -------------------------------------------------------
>
> Key: XMLBEANS-612
> URL: https://issues.apache.org/jira/browse/XMLBEANS-612
> Project: XMLBeans
> Issue Type: New Feature
> Affects Versions: Version 5.0.3
> Reporter: Dominik Stadler
> Assignee: Dominik Stadler
> Priority: Major
> Fix For: Version 5.1.0
>
>
> The project [https://github.com/centic9/poi-on-android] allows to run Apache
> POI as part of Android Apps and thus also uses XMLBeans.
> When trying to update to Apache POI 5.2.2 and XMLBeans 5.1.0, I saw that
> there is a problem with the Class-loading.
> XMLBeans tries to do the following
> {noformat}
> cl.getResource("xyz.class") {noformat}
> However on Android you cannot get class-resources this way.
> It seems this is only done to prevent a ClassNotFoundException in the call to
> {{Class.forName}} which follows.
>
> Therefore I propose to change the code as follows so that we simply expect a
> ClassNotFoundException instead of doing this separate lookup via getResource()
> {noformat}
> // BEGIN CHANGES
> =========================================================================
> //
> // Simply remove this pre-check and handle ClassNotFoundException below
> // as Android does not find .class-files in getResource()
> //
> // See
> https://stackoverflow.com/questions/72616517/looking-up-class-files-via-classloader-getresource-on-android
> // for a related question
> //
> /*if (cl.getResource(clName.replace(".", "/") + ".class") == null) {
> // if the first class isn't found in the package, continue with the next
> package
> break;
> }*/
> try {
> @SuppressWarnings("unchecked")
> Class<? extends SchemaTypeLoader> cls = (Class<? extends
> SchemaTypeLoader>) Class.forName(clName, true, cl);
> list.add((SchemaTypeLoader) cls.getDeclaredField("typeSystem").get(null));
> } catch (ClassNotFoundException e) {
> // if the first class isn't found in the package, continue with the next
> package
> // this can happen and thus is ignored here
> } catch (Exception e) {
> throw new XmlRuntimeException(e);
> }
> // END-CHANGES
> ========================================================================={noformat}
>
> Applying this change locally makes the project work on Android with Apache
> POI 5.2.2 and XMLBeans 5.1.0.
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