[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-4864) "Cannot read files twice on NativeScanner" exception when using multiple persistence.xml

[subes (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-4864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=36371#action_36371 ] 

subes commented on HHH-4864:
----------------------------

This works for me:

@NotThreadSafe
public class MergedPersistenceUnitManager extends DefaultPersistenceUnitManager {

    @Override
    protected void postProcessPersistenceUnitInfo(MutablePersistenceUnitInfo newPU) {
        super.postProcessPersistenceUnitInfo(newPU);
        /* ++ changed ++ treat RootPU as Jar and remove RootPU so its not duplicate */
        newPU.addJarFileUrl(newPU.getPersistenceUnitRootUrl());
        newPU.setPersistenceUnitRootUrl(null);
        /* -- changed -- */
        final String persistenceUnitName = newPU.getPersistenceUnitName();
        final PersistenceUnitInfo oldPU = getPersistenceUnitInfo(persistenceUnitName);
        if (oldPU != null) {
            List<URL> urls = oldPU.getJarFileUrls();
            for (URL url : urls) {
                newPU.addJarFileUrl(url);
            }
            List<String> managedClassNames = oldPU.getManagedClassNames();
            for (String managedClassName : managedClassNames) {
                newPU.addManagedClassName(managedClassName);
            }
            List<String> mappingFileNames = oldPU.getMappingFileNames();
            for (String mappingFileName : mappingFileNames) {
                newPU.addMappingFileName(mappingFileName);
            }
            Properties oldProperties = oldPU.getProperties();
            Properties newProperties = newPU.getProperties();
            newProperties.putAll(oldProperties);
            newPU.setProperties(newProperties);
        }
    }

}

> "Cannot read files twice on NativeScanner" exception when using multiple persistence.xml
> ----------------------------------------------------------------------------------------
>
>                 Key: HHH-4864
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4864
>             Project: Hibernate Core
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 3.5.0-Beta-3
>            Reporter: Bouiaw
>
> When subclassing DefaultPersistenceUnitManager as described in http://ancientprogramming.blogspot.com/2007/05/multiple-persistencexml-files-and.html in order to have my entities in different jars, Hibernate 3.5-Beta3 throw the following exception (it worked with previous version of Hibernate) :
> java.lang.RuntimeException: error trying to scan <jar-file>: file:/Users/bouiaw/resthub/resthub-core/target/classes/
> 	at org.hibernate.ejb.Ejb3Configuration.scanForClasses(Ejb3Configuration.java:700)
> 	at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:465)
> 	at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:165)
> 	at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:225)
> 	at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:288)
> 	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1457)
> 	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1397)
> 	... 51 more
> Caused by: org.hibernate.AssertionFailure: Cannot read files twice on NativeScanner
> 	at org.hibernate.ejb.packaging.NativeScanner.getFilesInJar(NativeScanner.java:168)
> 	at org.hibernate.ejb.Ejb3Configuration.addScannedEntries(Ejb3Configuration.java:393)
> 	at org.hibernate.ejb.Ejb3Configuration.scanForClasses(Ejb3Configuration.java:697)
> 	... 57 more

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