HHH-8363 ClassLoaderServiceImpl should be defined as Stoppable

- also fix problem with JpaIntegrator holding references to beanmanager

Conflicts:
	hibernate-core/src/main/java/org/hibernate/boot/registry/classloading/internal/ClassLoaderServiceImpl.java
	hibernate-core/src/main/java/org/hibernate/boot/registry/classloading/spi/ClassLoaderService.java
	hibernate-entitymanager/src/main/java/org/hibernate/jpa/event/spi/JpaIntegrator.java

hibernate-core/src/main/java/org/hibernate/internal/SessionFactoryImpl.java

@@ -294,6 +294,7 @@ public final class SessionFactoryImpl
 				for ( Integrator integrator : integrators ) {
 					integrator.disintegrate( SessionFactoryImpl.this, SessionFactoryImpl.this.serviceRegistry );
 				}
+                integrators.clear();
 			}
 		}
 
@@ -715,6 +716,7 @@ public final class SessionFactoryImpl
 				for ( Integrator integrator : integrators ) {
 					integrator.disintegrate( SessionFactoryImpl.this, SessionFactoryImpl.this.serviceRegistry );
 				}
+                integrators.clear();
 			}
 		}
 

hibernate-core/src/main/java/org/hibernate/service/classloading/internal/ClassLoaderServiceImpl.java

@@ -33,6 +33,7 @@ import java.util.Enumeration;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.LinkedHashSet;
+import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
 import java.util.ServiceLoader;
@@ -52,6 +53,7 @@ public class ClassLoaderServiceImpl implements ClassLoaderService {
 	private static final Logger log = Logger.getLogger( ClassLoaderServiceImpl.class );
 
 	private final ClassLoader aggregatedClassLoader;
+    private final LinkedList<ServiceLoader> loaders = new LinkedList<ServiceLoader>();
 
 	public ClassLoaderServiceImpl() {
 		this( ClassLoaderServiceImpl.class.getClassLoader() );
@@ -231,14 +233,23 @@ public class ClassLoaderServiceImpl implements ClassLoaderService {
 
 	@Override
 	public <S> LinkedHashSet<S> loadJavaServices(Class<S> serviceContract) {
-		final ServiceLoader<S> loader = ServiceLoader.load( serviceContract, aggregatedClassLoader );
-		final LinkedHashSet<S> services = new LinkedHashSet<S>();
-		for ( S service : loader ) {
+		ServiceLoader<S> serviceLoader = ServiceLoader.load( serviceContract, aggregatedClassLoader );
+        final LinkedHashSet<S> services = new LinkedHashSet<S>();
+		for ( S service : serviceLoader) {
 			services.add( service );
 		}
-
+        loaders.add(serviceLoader);
 		return services;
 	}
+
+    @Override
+    public void stop() {
+        while (!loaders.isEmpty()){
+            ServiceLoader loader = loaders.removeLast();
+            loader.reload();//clear service loader providers
+        }
+    }
+    
 	private static class AggregatedClassLoader extends ClassLoader {
 		private final ClassLoader[] individualClassLoaders;
 

hibernate-core/src/main/java/org/hibernate/service/classloading/spi/ClassLoaderService.java

@@ -29,13 +29,14 @@ import java.util.LinkedHashSet;
 import java.util.List;
 
 import org.hibernate.service.Service;
+import org.hibernate.service.spi.Stoppable;
 
 /**
  * A service for interacting with class loaders
  *
  * @author Steve Ebersole
  */
-public interface ClassLoaderService extends Service {
+public interface ClassLoaderService extends Service, Stoppable {
 	/**
 	 * Locate a class by name
 	 *

hibernate-entitymanager/src/main/java/org/hibernate/ejb/event/JpaIntegrator.java

@@ -57,18 +57,7 @@ import org.hibernate.service.spi.SessionFactoryServiceRegistry;
  * @author Steve Ebersole
  */
 public class JpaIntegrator implements Integrator {
-	private static final DuplicationStrategy JPA_DUPLICATION_STRATEGY = new DuplicationStrategy() {
-		@Override
-		public boolean areMatch(Object listener, Object original) {
-			return listener.getClass().equals( original.getClass() ) &&
-					HibernateEntityManagerEventListener.class.isInstance( original );
-		}
-
-		@Override
-		public Action getAction() {
-			return Action.KEEP_ORIGINAL;
-		}
-	};
+	private static final DuplicationStrategy JPA_DUPLICATION_STRATEGY = new JPADuplicationStrategy();
 
 	private static final DuplicationStrategy JACC_DUPLICATION_STRATEGY = new DuplicationStrategy() {
 		@Override
@@ -260,4 +249,17 @@ public class JpaIntegrator implements Integrator {
 			throw new HibernateException( "Could not instantiate requested listener [" + listenerImpl + "]", e );
         }
     }
+
+    private static class JPADuplicationStrategy implements DuplicationStrategy {
+        @Override
+        public boolean areMatch(Object listener, Object original) {
+            return listener.getClass().equals( original.getClass() ) &&
+                    HibernateEntityManagerEventListener.class.isInstance( original );
+        }
+
+        @Override
+        public Action getAction() {
+            return Action.KEEP_ORIGINAL;
+        }
+    }
 }