Error using Second Level Cache on OSGi/Karaf/hibernate/Jcache/ehcache

Using:

• Hibernate 5.4.2
• Karaf 4.2.5
• Ehcache 3
• Jcache 1.1.1

A bundle application on OSGi environment using karaf works fine if the second level cache is off, but if the property
hibernate.cache.use_second_level_cache is true there is an

Caused by: java.lang.ClassNotFoundException: org.ehcache.jsr107.EhcacheCachingProvider

Ehcache bundle is exporting EhcacheCachingProvider but is not accessible by hibernate classloader

```
service; [javax.cache.spi.CachingProvider] with properties:
component.id = 20
component.name = org.ehcache.jsr107.EhcacheCachingProvider
service.bundleid = 97
service.id = 170
service.scope = bundle
```

The problem is in class:
```
org.hibernate.cache.jcache.internal.JCacheRegionFactory trying to get a CachingProvider
```

In OSGI environments, the classloader used is not the org.hibernate.orm.jcache, instead is used sun.misc.Launcher$AppClassLoader

So, a java.lang.ClassNotFoundException: org.ehcache.jsr107.EhcacheCachingProvider is throwed by hibernate-jcache.