Anticipating Ales' work on the optimization between HEM and the micro container ( http://opensource.atlassian.com/projects/hibernate/browse/HHH-4191 ),

I've added a way to pass an instance of Scanner to the persistence unit:
- an actual instance (recommended)
- the class name of the instance to use

Use the hibernate.ejb.resource_scanner property name (HibernatePersistence.SCANNER)

In our case, the JPA deployer needs to add the following property

Map<String, Object> properties = new HashMap<String, Object>(1);
properties.put( HibernatePersistence.SCANNER, mcScannerInstance);
persistenceProvider.createContainerEntityManagerFactory(persistenceUnitInfo, properties);




I've also changed part of the Scanner interface from

    /**
  * return all files in the classpath (ie PU visibility) matching one of these file names
  * if filePatterns is empty, return all files
  * the use case is really exact file name.
  */
 Set<NamedInputStream> getFilesInClasspath(URL jartoScan, Set<String> filePatterns);

to

    /**
  * Return all files in the classpath (ie PU visibility) matching one of these file names
  * if filePatterns is empty, return all files
  * the use case is really exact file name.
  *
  * NOT USED by HEM at the moment. We use exact file search via getResourceAsStream for now.
  */
 Set<NamedInputStream> getFilesInClasspath(Set<String> filePatterns);


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