Commits on May 1, 2020

1. Add package-to-scan feature …

   # Context
   
   Some applications can have thousands of classes.
   When JPA is configured to scan classes (`exclude-unlisted-classes` is `false` in `persistence.xml`), the time used to scan all classes can be quite long.
   With reasonable application size, class scanning can take only ten's of milliseconds but for heavy application it can take a few seconds.
   
   In order to help reducing startup time, we can restrict class scanning to a pre-configured list of known packages to avoid loading unnecessary classes metadata.
   
   # What was done
   
   - Introduced a new property `PersistenceUnitProperties.PACKAGES_TO_SCAN`: `eclipselink.packages-to-scan`
   - Modified `PersistenceUnitProcessor.getClassNamesFromURL` to only return eligible classes
   
   This new property takes as a value a list of packages as a string: `com.foo.bar, some.other.packages`
   
   # Performance result
   
   I've tested this feature with 2 applications, one with ~1000 classes and another with more than 30k classes.
   `MetadataProcessor.initPersistenceUnitClasses` was faster by ~25% for the small application and ~45% for the big one.
   
   Signed-off-by: Alexandre Jacob <alexandref.jacob@gmail.com>

   

   ajacob committed May 1, 2020
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