HHH-16058 Removing Environment#getBytecodeProvider

hibernate-core/src/main/java/org/hibernate/bytecode/internal/BytecodeProviderInitiator.java

@@ -8,13 +8,23 @@ package org.hibernate.bytecode.internal;
 
 import java.util.Map;
 
+import org.hibernate.Internal;
 import org.hibernate.boot.registry.StandardServiceInitiator;
 import org.hibernate.bytecode.spi.BytecodeProvider;
-import org.hibernate.cfg.Environment;
+import org.hibernate.internal.CoreMessageLogger;
+import org.hibernate.internal.util.config.ConfigurationHelper;
 import org.hibernate.service.spi.ServiceRegistryImplementor;
 
+import org.jboss.logging.Logger;
+
+import static org.hibernate.cfg.AvailableSettings.BYTECODE_PROVIDER;
+
 public final class BytecodeProviderInitiator implements StandardServiceInitiator<BytecodeProvider> {
 
+	public static final String BYTECODE_PROVIDER_NAME_BYTEBUDDY = "bytebuddy";
+	public static final String BYTECODE_PROVIDER_NAME_NONE = "none";
+	public static final String BYTECODE_PROVIDER_NAME_DEFAULT = BYTECODE_PROVIDER_NAME_BYTEBUDDY;
+
 	/**
 	 * Singleton access
 	 */
@@ -22,9 +32,8 @@ public final class BytecodeProviderInitiator implements StandardServiceInitiator
 
 	@Override
 	public BytecodeProvider initiateService(Map<String, Object> configurationValues, ServiceRegistryImplementor registry) {
-		// TODO in 6 this will no longer use Environment, which is configured via global environment variables,
+		String provider = ConfigurationHelper.getString( BYTECODE_PROVIDER, configurationValues, BYTECODE_PROVIDER_NAME_DEFAULT );
-		// but move to a component which can be reconfigured differently in each registry.
+		return buildBytecodeProvider( provider );
-		return Environment.getBytecodeProvider();
 	}
 
 	@Override
@@ -32,4 +41,35 @@ public final class BytecodeProviderInitiator implements StandardServiceInitiator
 		return BytecodeProvider.class;
 	}
 
+	@Internal
+	public static BytecodeProvider buildDefaultBytecodeProvider() {
+		return buildBytecodeProvider( BYTECODE_PROVIDER_NAME_BYTEBUDDY );
+	}
+
+	@Internal
+	public static BytecodeProvider buildBytecodeProvider(String providerName) {
+
+		CoreMessageLogger LOG = Logger.getMessageLogger( CoreMessageLogger.class, BytecodeProviderInitiator.class.getName() );
+		LOG.bytecodeProvider( providerName );
+
+		if ( BYTECODE_PROVIDER_NAME_NONE.equals( providerName ) ) {
+			return new org.hibernate.bytecode.internal.none.BytecodeProviderImpl();
+		}
+		if ( BYTECODE_PROVIDER_NAME_BYTEBUDDY.equals( providerName ) ) {
+			return new org.hibernate.bytecode.internal.bytebuddy.BytecodeProviderImpl();
+		}
+
+		// There is no need to support plugging in a custom BytecodeProvider via FQCN
+		// as it's possible to plug a custom BytecodeProviderInitiator into the bootstrap.
+		//
+		// This also allows integrators to inject a BytecodeProvider instance which has some
+		// state: particularly useful to inject proxy definitions which have been prepared in
+		// advance.
+		// See also https://hibernate.atlassian.net/browse/HHH-13804 and how this was solved in
+		// Quarkus.
+
+		LOG.unknownBytecodeProvider( providerName, BYTECODE_PROVIDER_NAME_DEFAULT );
+		return new org.hibernate.bytecode.internal.bytebuddy.BytecodeProviderImpl();
+	}
+
 }

hibernate-core/src/main/java/org/hibernate/cfg/AvailableSettings.java

@@ -1533,7 +1533,7 @@ public interface AvailableSettings {
 	String CHECK_NULLABILITY = "hibernate.check_nullability";
 
 	/**
-	 * Selects a bytecode enhancment library.
+	 * Selects a bytecode enhancement library.
 	 * <p>
 	 * At present only bytebuddy is supported, bytebuddy being the default since version 5.3.
 	 */

hibernate-core/src/main/java/org/hibernate/cfg/Environment.java

@@ -13,6 +13,7 @@ import java.util.Properties;
 import org.hibernate.HibernateException;
 import org.hibernate.Internal;
 import org.hibernate.Version;
+import org.hibernate.bytecode.internal.BytecodeProviderInitiator;
 import org.hibernate.bytecode.spi.BytecodeProvider;
 import org.hibernate.internal.CoreMessageLogger;
 import org.hibernate.internal.util.ConfigHelper;
@@ -35,8 +36,8 @@ import static org.hibernate.internal.log.DeprecationLogger.DEPRECATION_LOGGER;
  * always determined by the {@code Environment} properties in {@link #getProperties()}.
  * </ul>
  * <p>
- * The only system-level properties are {@value #USE_REFLECTION_OPTIMIZER} and
+ * The only system-level property is {@value #USE_REFLECTION_OPTIMIZER},
- * {@value #BYTECODE_PROVIDER}.
+ * and it's deprecated.
  * <p>
  * {@code Environment} properties are populated by calling {@link System#getProperties()}
  * and then from a resource named {@code /hibernate.properties}, if it exists. System
@@ -141,7 +142,6 @@ import static org.hibernate.internal.log.DeprecationLogger.DEPRECATION_LOGGER;
 public final class Environment implements AvailableSettings {
 	private static final CoreMessageLogger LOG = Logger.getMessageLogger( CoreMessageLogger.class, Environment.class.getName());
 
-	private static final BytecodeProvider BYTECODE_PROVIDER_INSTANCE;
 	private static final boolean ENABLE_REFLECTION_OPTIMIZER;
 
 	private static final Properties GLOBAL_PROPERTIES;
@@ -193,8 +193,6 @@ public final class Environment implements AvailableSettings {
 		else {
 			DEPRECATION_LOGGER.deprecatedSettingForRemoval( USE_REFLECTION_OPTIMIZER, "true" );
 		}
-
-		BYTECODE_PROVIDER_INSTANCE = buildBytecodeProvider( GLOBAL_PROPERTIES );
 	}
 
 	/**
@@ -203,12 +201,11 @@ public final class Environment implements AvailableSettings {
 	 * @return True if reflection optimization should be used; false otherwise.
 	 *
 	 * @see #USE_REFLECTION_OPTIMIZER
-	 * @see #getBytecodeProvider()
 	 * @see BytecodeProvider#getReflectionOptimizer
 	 *
 	 * @deprecated Deprecated to indicate that the method will be moved to
 	 * {@link org.hibernate.boot.spi.SessionFactoryOptions} /
-	 * {@link org.hibernate.boot.SessionFactoryBuilder} - probably in 6.0.
+	 * {@link org.hibernate.boot.SessionFactoryBuilder}.
 	 * See <a href="https://hibernate.atlassian.net/browse/HHH-12194">HHH-12194</a> and
 	 * <a href="https://hibernate.atlassian.net/browse/HHH-12193">HHH-12193</a> for details
 	 */
@@ -217,23 +214,11 @@ public final class Environment implements AvailableSettings {
 		return ENABLE_REFLECTION_OPTIMIZER;
 	}
 
-	/**
-	 * @deprecated Deprecated to indicate that the method will be moved to
-	 * {@link org.hibernate.boot.spi.SessionFactoryOptions} /
-	 * {@link org.hibernate.boot.SessionFactoryBuilder} - probably in 6.0.
-	 * See <a href="https://hibernate.atlassian.net/browse/HHH-12194">HHH-12194</a> and
-	 * <a href="https://hibernate.atlassian.net/browse/HHH-12193">HHH-12193</a> for details
-	 */
-	@Deprecated
-	public static BytecodeProvider getBytecodeProvider() {
-		return BYTECODE_PROVIDER_INSTANCE;
-	}
-
 	/**
 	 * Disallow instantiation
 	 */
 	private Environment() {
-		throw new UnsupportedOperationException();
+		//not to be constructed
 	}
 
 	/**
@@ -246,36 +231,36 @@ public final class Environment implements AvailableSettings {
 		return copy;
 	}
 
+	/**
+	 * @deprecated Replaced by {@code org.hibernate.bytecode.internal.BytecodeProviderInitiator#BYTECODE_PROVIDER_NAME_BYTEBUDDY},
+	 * however note that that's an internal contract: a different BytecodeProvider Initiator might ignore these constants
+	 * or interpret them differently.
+	 */
+	@Deprecated(forRemoval = true)
 	public static final String BYTECODE_PROVIDER_NAME_BYTEBUDDY = "bytebuddy";
-	public static final String BYTECODE_PROVIDER_NAME_NONE = "none";
-	public static final String BYTECODE_PROVIDER_NAME_DEFAULT = BYTECODE_PROVIDER_NAME_BYTEBUDDY;
 
+	/**
+	 * @deprecated Replaced by {@code org.hibernate.bytecode.internal.BytecodeProviderInitiator#BYTECODE_PROVIDER_NAME_NONE},
+	 * however note that that's an internal contract: a different BytecodeProvider Initiator might ignore these constants
+	 * or interpret them differently.
+	 */
+	@Deprecated(forRemoval = true)
+	public static final String BYTECODE_PROVIDER_NAME_NONE = "none";
+
+	/**
+	 * @deprecated Replaced by {@code org.hibernate.bytecode.internal.BytecodeProviderInitiator#BYTECODE_PROVIDER_NAME_DEFAULT}
+	 * however note that that's an internal contract: a different BytecodeProvider Initiator might apply a different default.
+	 */
+	@Deprecated(forRemoval = true)
+	public static final String BYTECODE_PROVIDER_NAME_DEFAULT = BytecodeProviderInitiator.BYTECODE_PROVIDER_NAME_BYTEBUDDY;
+
+	/**
+	 * @deprecated this will be removed; retrieval of the BytecodeProvider should be performed via the {@link org.hibernate.service.ServiceRegistry}.
+	 */
+	@Deprecated(forRemoval = true)
 	public static BytecodeProvider buildBytecodeProvider(Properties properties) {
 		String provider = ConfigurationHelper.getString( BYTECODE_PROVIDER, properties, BYTECODE_PROVIDER_NAME_DEFAULT );
-		return buildBytecodeProvider( provider );
+		return BytecodeProviderInitiator.buildBytecodeProvider( provider );
 	}
 
-	private static BytecodeProvider buildBytecodeProvider(String providerName) {
-		if ( BYTECODE_PROVIDER_NAME_NONE.equals( providerName ) ) {
-			return new org.hibernate.bytecode.internal.none.BytecodeProviderImpl();
-		}
-		if ( BYTECODE_PROVIDER_NAME_BYTEBUDDY.equals( providerName ) ) {
-			return new org.hibernate.bytecode.internal.bytebuddy.BytecodeProviderImpl();
-		}
-
-		LOG.bytecodeProvider( providerName );
-
-		// there is no need to support plugging in a custom BytecodeProvider via FQCN:
-		// - the static helper methods on this class are deprecated
-		// - it's possible to plug a custom BytecodeProvider directly into the ServiceRegistry
-		//
-		// This also allows integrators to inject a BytecodeProvider instance which has some
-		// state; particularly useful to inject proxy definitions which have been prepared in
-		// advance.
-		// See also https://hibernate.atlassian.net/browse/HHH-13804 and how this was solved in
-		// Quarkus.
-
-		LOG.unknownBytecodeProvider( providerName, BYTECODE_PROVIDER_NAME_DEFAULT );
-		return new org.hibernate.bytecode.internal.bytebuddy.BytecodeProviderImpl();
-	}
 }

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

@@ -1290,7 +1290,7 @@ public interface CoreMessageLogger extends BasicLogger {
 	void unexpectedRowCounts();
 
 	@LogMessage(level = WARN)
-	@Message(value = "unrecognized bytecode provider [%s], using [%s] by default", id = 382)
+	@Message(value = "Unrecognized bytecode provider [%s]; using the default implementation [%s]", id = 382)
 	void unknownBytecodeProvider(String providerName, String defaultProvider);
 
 	@LogMessage(level = WARN)

hibernate-core/src/main/java/org/hibernate/jpa/internal/enhance/EnhancingClassTransformerImpl.java

@@ -7,10 +7,13 @@
 package org.hibernate.jpa.internal.enhance;
 
 import java.security.ProtectionDomain;
+import java.util.Objects;
 
 import org.hibernate.bytecode.enhance.spi.EnhancementContext;
 import org.hibernate.bytecode.enhance.spi.EnhancementContextWrapper;
 import org.hibernate.bytecode.enhance.spi.Enhancer;
+import org.hibernate.bytecode.internal.BytecodeProviderInitiator;
+import org.hibernate.bytecode.spi.BytecodeProvider;
 import org.hibernate.bytecode.spi.ClassTransformer;
 import org.hibernate.cfg.Environment;
 
@@ -23,9 +26,12 @@ import jakarta.persistence.spi.TransformerException;
 public class EnhancingClassTransformerImpl implements ClassTransformer {
 
 	private final EnhancementContext enhancementContext;
+	private final BytecodeProvider bytecodeProvider;
 
 	public EnhancingClassTransformerImpl(EnhancementContext enhancementContext) {
+		Objects.requireNonNull( enhancementContext );
 		this.enhancementContext = enhancementContext;
+		this.bytecodeProvider = BytecodeProviderInitiator.buildDefaultBytecodeProvider();
 	}
 
 	@Override
@@ -41,12 +47,15 @@ public class EnhancingClassTransformerImpl implements ClassTransformer {
 		// It also assumed that all calls come from the same class loader, which is fair, but this makes it more robust.
 
 		try {
-			Enhancer enhancer = Environment.getBytecodeProvider().getEnhancer( new EnhancementContextWrapper( enhancementContext, loader ) );
+			Enhancer enhancer = bytecodeProvider.getEnhancer( new EnhancementContextWrapper( enhancementContext, loader ) );
 			return enhancer.enhance( className, classfileBuffer );
 		}
 		catch (final Exception e) {
 			throw new TransformerException( "Error performing enhancement of " + className, e );
 		}
+		finally {
+			bytecodeProvider.resetCaches();
+		}
 	}
 
 }

hibernate-core/src/main/java/org/hibernate/metamodel/internal/EmbeddableRepresentationStrategyPojo.java

@@ -13,13 +13,12 @@ import java.util.function.Supplier;
 
 import org.hibernate.HibernateException;
 import org.hibernate.boot.registry.selector.spi.StrategySelector;
+import org.hibernate.bytecode.spi.BytecodeProvider;
 import org.hibernate.bytecode.spi.ProxyFactoryFactory;
 import org.hibernate.bytecode.spi.ReflectionOptimizer;
 import org.hibernate.cfg.Environment;
-import org.hibernate.engine.config.spi.ConfigurationService;
 import org.hibernate.internal.util.ReflectHelper;
 import org.hibernate.internal.util.StringHelper;
-import org.hibernate.internal.util.config.ConfigurationHelper;
 import org.hibernate.mapping.Backref;
 import org.hibernate.mapping.Component;
 import org.hibernate.mapping.IndexBackref;
@@ -33,6 +32,7 @@ import org.hibernate.property.access.internal.PropertyAccessStrategyIndexBackRef
 import org.hibernate.property.access.spi.BuiltInPropertyAccessStrategies;
 import org.hibernate.property.access.spi.PropertyAccess;
 import org.hibernate.property.access.spi.PropertyAccessStrategy;
+import org.hibernate.service.ServiceRegistry;
 import org.hibernate.type.descriptor.java.JavaType;
 import org.hibernate.type.descriptor.java.spi.JavaTypeRegistry;
 import org.hibernate.type.internal.CompositeUserTypeJavaTypeWrapper;
@@ -187,8 +187,9 @@ public class EmbeddableRepresentationStrategyPojo extends AbstractEmbeddableRepr
 			propertyAccessMap.put( property.getName(), getPropertyAccesses()[i] );
 			i++;
 		}
+		final BytecodeProvider bytecodeProvider = creationContext.getServiceRegistry().getService( BytecodeProvider.class );
 
-		return Environment.getBytecodeProvider().getReflectionOptimizer(
+		return bytecodeProvider.getReflectionOptimizer(
 				bootDescriptor.getComponentClass(),
 				propertyAccessMap
 		);

hibernate-core/src/main/java/org/hibernate/metamodel/internal/EntityRepresentationStrategyPojoStandard.java

@@ -20,7 +20,6 @@ import org.hibernate.bytecode.spi.ReflectionOptimizer;
 import org.hibernate.bytecode.spi.ReflectionOptimizer.InstantiationOptimizer;
 import org.hibernate.cfg.Environment;
 import org.hibernate.classic.Lifecycle;
-import org.hibernate.engine.spi.SessionFactoryImplementor;
 import org.hibernate.internal.CoreLogging;
 import org.hibernate.internal.CoreMessageLogger;
 import org.hibernate.internal.util.ReflectHelper;
@@ -140,8 +139,7 @@ public class EntityRepresentationStrategyPojoStandard implements EntityRepresent
 			identifierPropertyAccess = makePropertyAccess( identifierProperty );
 		}
 
-//		final BytecodeProvider bytecodeProvider = creationContext.getBootstrapContext().getBytecodeProvider();
+		final BytecodeProvider bytecodeProvider = creationContext.getBootstrapContext().getServiceRegistry().getService( BytecodeProvider.class );
-		final BytecodeProvider bytecodeProvider = Environment.getBytecodeProvider();
 
 		final EntityMetamodel entityMetamodel = runtimeDescriptor.getEntityMetamodel();
 		ProxyFactory proxyFactory = null;

hibernate-core/src/main/java/org/hibernate/proxy/AbstractLazyInitializer.java

@@ -265,15 +265,16 @@ public abstract class AbstractLazyInitializer implements LazyInitializer {
 	/**
 	 * Initialize internal state based on the currently attached session,
 	 * in order to be ready to load data even after the proxy is detached from the session.
-	 *
-	 * This method only has any effect if
-	 * {@link SessionFactoryOptions#isInitializeLazyStateOutsideTransactionsEnabled()} is {@code true}.
 	 */
 	protected void prepareForPossibleLoadingOutsideTransaction() {
 		if ( session != null ) {
 			allowLoadOutsideTransaction = session.getFactory().getSessionFactoryOptions().isInitializeLazyStateOutsideTransactionsEnabled();
 
-			if ( allowLoadOutsideTransaction && sessionFactoryUuid == null ) {
+			if ( sessionFactoryUuid == null ) {
+				//we're going to need the UUID even if we the SessionFactory configuration doesn't
+				// allow any operations on it, as we need it to match deserialized objects with
+				// the originating SessionFactory: at very least it's useful to actually get
+				// such configuration, so to know if such operation isn't allowed or configured otherwise.
 				sessionFactoryUuid = session.getFactory().getUuid();
 			}
 		}

hibernate-core/src/main/java/org/hibernate/proxy/AbstractSerializableProxy.java

@@ -17,7 +17,7 @@ public abstract class AbstractSerializableProxy implements Serializable {
 	private final String entityName;
 	private final Object id;
 	private final Boolean readOnly;
-	private final String sessionFactoryUuid;
+	protected final String sessionFactoryUuid;
 	private final boolean allowLoadOutsideTransaction;
 
 	protected AbstractSerializableProxy(

hibernate-core/src/main/java/org/hibernate/proxy/pojo/bytebuddy/SerializableProxy.java

@@ -6,12 +6,13 @@
  */
 package org.hibernate.proxy.pojo.bytebuddy;
 
-import java.io.Serializable;
 import java.lang.reflect.Method;
+import java.util.Objects;
 
 import org.hibernate.bytecode.internal.bytebuddy.BytecodeProviderImpl;
 import org.hibernate.bytecode.spi.BytecodeProvider;
-import org.hibernate.cfg.Environment;
+import org.hibernate.engine.spi.SessionFactoryImplementor;
+import org.hibernate.internal.SessionFactoryRegistry;
 import org.hibernate.proxy.AbstractSerializableProxy;
 import org.hibernate.proxy.HibernateProxy;
 import org.hibernate.type.CompositeType;
@@ -109,13 +110,32 @@ public final class SerializableProxy extends AbstractSerializableProxy {
 	}
 
 	private Object readResolve() {
-		BytecodeProvider bytecodeProvider = Environment.getBytecodeProvider();
+		final SessionFactoryImplementor sessionFactory = retrieveMatchingSessionFactory( this.sessionFactoryUuid );
-		if ( !( bytecodeProvider instanceof BytecodeProviderImpl ) ) {
+		BytecodeProviderImpl byteBuddyBytecodeProvider = retrieveByteBuddyBytecodeProvider( sessionFactory );
-			throw new IllegalStateException( "The bytecode provider is not ByteBuddy, unable to deserialize a ByteBuddy proxy." );
+		HibernateProxy proxy = byteBuddyBytecodeProvider.getByteBuddyProxyHelper().deserializeProxy( this );
-		}
-
-		HibernateProxy proxy = ( (BytecodeProviderImpl) bytecodeProvider ).getByteBuddyProxyHelper().deserializeProxy( this );
 		afterDeserialization( (ByteBuddyInterceptor) proxy.getHibernateLazyInitializer() );
 		return proxy;
 	}
+
+	private static SessionFactoryImplementor retrieveMatchingSessionFactory(final String sessionFactoryUuid) {
+		Objects.requireNonNull( sessionFactoryUuid );
+		final SessionFactoryImplementor sessionFactory = SessionFactoryRegistry.INSTANCE.getSessionFactory( sessionFactoryUuid );
+		if ( sessionFactory != null ) {
+			return sessionFactory;
+		}
+		else {
+			throw new IllegalStateException( "Could not identify any active SessionFactory having UUID " + sessionFactoryUuid );
+		}
+	}
+
+	private static BytecodeProviderImpl retrieveByteBuddyBytecodeProvider(final SessionFactoryImplementor sessionFactory) {
+		final BytecodeProvider bytecodeProvider = sessionFactory.getServiceRegistry().getService( BytecodeProvider.class );
+		if ( bytecodeProvider instanceof BytecodeProviderImpl ) {
+			return (BytecodeProviderImpl) bytecodeProvider;
+		}
+		else {
+			throw new IllegalStateException( "Unable to deserialize a SerializableProxy proxy: the bytecode provider is not ByteBuddy." );
+		}
+	}
+
 }

hibernate-core/src/test/java/org/hibernate/orm/test/bytecode/ReflectionOptimizerTest.java

@@ -6,14 +6,17 @@
  */
 package org.hibernate.orm.test.bytecode;
 
+import static org.hibernate.bytecode.internal.BytecodeProviderInitiator.buildDefaultBytecodeProvider;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 
 import org.hibernate.bytecode.spi.BytecodeProvider;
 import org.hibernate.bytecode.spi.ReflectionOptimizer;
-import org.hibernate.cfg.Environment;
+
 import org.hibernate.testing.TestForIssue;
 import org.hibernate.testing.junit4.BaseUnitTestCase;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
 import org.junit.Test;
 
 /**
@@ -21,9 +24,23 @@ import org.junit.Test;
  */
 public class ReflectionOptimizerTest extends BaseUnitTestCase {
 
+	private static BytecodeProvider provider;
+
+	@BeforeClass
+	public static void initBytecodeProvider() {
+		provider = buildDefaultBytecodeProvider();
+	}
+
+	@AfterClass
+	public static void clearBytecodeProvider() {
+		if ( provider != null ) {
+			provider.resetCaches();
+			provider = null;
+		}
+	}
+
 	@Test
 	public void testReflectionOptimization() {
-		BytecodeProvider provider = Environment.getBytecodeProvider();
 		ReflectionOptimizer optimizer = provider.getReflectionOptimizer(
 				Bean.class,
 		        BeanReflectionHelper.getGetterNames(),
@@ -47,7 +64,6 @@ public class ReflectionOptimizerTest extends BaseUnitTestCase {
 	@Test
 	@TestForIssue(jiraKey = "HHH-12584")
 	public void testAbstractClass() {
-		BytecodeProvider provider = Environment.getBytecodeProvider();
 		ReflectionOptimizer reflectionOptimizer = provider.getReflectionOptimizer( AbstractClass.class, new String[]{ "getProperty" },
 			new String[]{ "setProperty" }, new Class[]{ String.class } );
 		assertNotNull( reflectionOptimizer );
@@ -56,7 +72,6 @@ public class ReflectionOptimizerTest extends BaseUnitTestCase {
 	@Test
 	@TestForIssue(jiraKey = "HHH-12584")
 	public void testInterface() {
-		BytecodeProvider provider = Environment.getBytecodeProvider();
 		ReflectionOptimizer reflectionOptimizer = provider.getReflectionOptimizer( Interface.class, new String[]{ "getProperty" },
 			new String[]{ "setProperty" }, new Class[]{ String.class } );
 		assertNotNull( reflectionOptimizer );
@@ -88,4 +103,5 @@ public class ReflectionOptimizerTest extends BaseUnitTestCase {
 
 		void setProperty(String property);
 	}
+
 }

hibernate-testing/src/main/java/org/hibernate/testing/bytecode/enhancement/BytecodeEnhancerRunner.java

@@ -32,6 +32,8 @@ import org.junit.runners.Suite;
 import org.junit.runners.model.InitializationError;
 import org.junit.runners.model.RunnerBuilder;
 
+import static org.hibernate.bytecode.internal.BytecodeProviderInitiator.buildDefaultBytecodeProvider;
+
 /**
  * @author Luis Barreiro
  */
@@ -182,7 +184,7 @@ public class BytecodeEnhancerRunner extends Suite {
 			EnhancementContext enhancerContext,
 			List<EnhancementSelector> selectors) {
 		return new EnhancingClassLoader(
-				Environment.getBytecodeProvider().getEnhancer( enhancerContext ),
+				buildDefaultBytecodeProvider().getEnhancer( enhancerContext ),
 				selectors
 		);
 	}

tooling/hibernate-ant/src/main/java/org/hibernate/tool/enhance/EnhancementTask.java

@@ -14,6 +14,8 @@ import org.hibernate.bytecode.enhance.spi.EnhancementContext;
 import org.hibernate.bytecode.enhance.spi.Enhancer;
 import org.hibernate.bytecode.enhance.spi.UnloadedClass;
 import org.hibernate.bytecode.enhance.spi.UnloadedField;
+import org.hibernate.bytecode.internal.BytecodeProviderInitiator;
+import org.hibernate.bytecode.spi.BytecodeProvider;
 import org.hibernate.cfg.Environment;
 
 import java.io.ByteArrayOutputStream;
@@ -30,6 +32,8 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
+import static org.hibernate.bytecode.internal.BytecodeProviderInitiator.buildDefaultBytecodeProvider;
+
 /**
  * Ant task for performing build-time enhancement of entity objects.
  *
@@ -162,8 +166,9 @@ public class EnhancementTask extends Task {
 			log( "Extended enhancement is enabled. Classes other than entities may be modified. You should consider access the entities using getter/setter methods and disable this property. Use at your own risk.", Project.MSG_WARN );
 		}
 
-		Enhancer enhancer = Environment.getBytecodeProvider().getEnhancer( enhancementContext );
+		final BytecodeProvider bytecodeProvider = buildDefaultBytecodeProvider();
-
+		try {
+			Enhancer enhancer = bytecodeProvider.getEnhancer( enhancementContext );
 			for ( File file : sourceSet ) {
 				byte[] enhancedBytecode = doEnhancement( file, enhancer );
 				if ( enhancedBytecode == null ) {
@@ -174,6 +179,10 @@ public class EnhancementTask extends Task {
 				log( "Successfully enhanced class [" + file + "]", Project.MSG_INFO );
 			}
 		}
+		finally {
+			bytecodeProvider.resetCaches();
+		}
+	}
 
 	private ClassLoader toClassLoader(List<File> runtimeClasspath) throws BuildException {
 		List<URL> urls = new ArrayList<>();

tooling/hibernate-enhance-maven-plugin/src/main/java/org/hibernate/orm/tooling/maven/MavenEnhancePlugin.java

@@ -38,10 +38,12 @@ import org.hibernate.bytecode.enhance.spi.EnhancementContext;
 import org.hibernate.bytecode.enhance.spi.Enhancer;
 import org.hibernate.bytecode.enhance.spi.UnloadedClass;
 import org.hibernate.bytecode.enhance.spi.UnloadedField;
-import org.hibernate.cfg.Environment;
+import org.hibernate.bytecode.spi.BytecodeProvider;
 
 import org.sonatype.plexus.build.incremental.BuildContext;
 
+import static org.hibernate.bytecode.internal.BytecodeProviderInitiator.buildDefaultBytecodeProvider;
+
 /**
  * This plugin will enhance Entity objects.
  *
@@ -153,7 +155,10 @@ public class MavenEnhancePlugin extends AbstractMojo {
 			log.warn( "Extended enhancement is enabled. Classes other than entities may be modified. You should consider access the entities using getter/setter methods and disable this property. Use at your own risk." );
 		}
 
-		final Enhancer enhancer = Environment.getBytecodeProvider().getEnhancer( enhancementContext );
+		//TODO allow the Maven plugin to configure the bytecode enhancer?
+		final BytecodeProvider bytecodeProvider = buildDefaultBytecodeProvider();
+		try {
+			final Enhancer enhancer = bytecodeProvider.getEnhancer( enhancementContext );
 
 			for ( File file : sourceSet ) {
 
@@ -169,6 +174,10 @@ public class MavenEnhancePlugin extends AbstractMojo {
 				}
 			}
 		}
+		finally {
+			bytecodeProvider.resetCaches();
+		}
+	}
 
 	private ClassLoader toClassLoader(List<File> runtimeClasspath) throws MojoExecutionException {
 		List<URL> urls = new ArrayList<URL>( runtimeClasspath.size() );

tooling/hibernate-gradle-plugin/src/main/java/org/hibernate/orm/tooling/gradle/enhance/EnhancementHelper.java

@@ -25,6 +25,7 @@ import org.hibernate.bytecode.enhance.spi.UnloadedField;
 import org.hibernate.cfg.Environment;
 import org.hibernate.orm.tooling.gradle.HibernateOrmSpec;
 
+import static org.hibernate.bytecode.internal.BytecodeProviderInitiator.buildDefaultBytecodeProvider;
 import static org.hibernate.orm.tooling.gradle.Helper.determineClassName;
 
 /**
@@ -130,8 +131,8 @@ public class EnhancementHelper {
 			}
 		};
 
-		//noinspection deprecation
+		//TODO allow the Gradle plugin to configure the bytecode enhancer?
-		return Environment.getBytecodeProvider().getEnhancer( enhancementContext );
+		return buildDefaultBytecodeProvider().getEnhancer( enhancementContext );
 	}
 
 	private static void writeOutEnhancedClass(byte[] enhancedBytecode, File file, Logger logger) {