HHH-12410 - Cannot use AttributeConverter with spatial types

HHH-12443 - Introduce TypeConfiguration

gradle/libraries.gradle

@@ -24,6 +24,8 @@ ext {
     javassistVersion = '3.22.0-GA'
     byteBuddyVersion = '1.8.0' // Now with JDK10 compatibility and preliminary support for JDK11
 
+    geolatteVersion = '1.3.0'
+
     // Wildfly version targeted by module ZIP; Arquillian/Shrinkwrap versions used for CDI testing and testing the module ZIP
     wildflyVersion = '12.0.0.Final'
     arquillianVersion = '1.1.11.Final'
@@ -31,6 +33,8 @@ ext {
     shrinkwrapDescriptorsVersion = '2.0.0-alpha-8'
     wildflyArquillianContainerVersion = '2.0.0.Final'
 
+    jodaTimeVersion = '2.3'
+
     libraries = [
             // Ant
             ant:            'org.apache.ant:ant:1.8.2',
@@ -74,6 +78,8 @@ ext {
             jaxb2_jaxb:     'org.jvnet.jaxb2_commons:jaxb2-basics-jaxb:2.2.4-1',
             jaxb2_jaxb_xjc: 'org.jvnet.jaxb2_commons:jaxb2-basics-jaxb-xjc:2.2.4-1',
 
+            geolatte:       "org.geolatte:geolatte-geom:${geolatteVersion}",
+
             // Animal Sniffer Ant Task and Java 1.6 API signature file
             // not using 1.9 for the time being due to MANIMALSNIFFER-34
             animal_sniffer:     'org.codehaus.mojo:animal-sniffer-ant-tasks:1.13',
@@ -105,6 +111,8 @@ ext {
             db2:             'com.ibm.db2:db2jcc:10.5',
             hana:            'com.sap.db.jdbc:ngdbc:2.2.1', // for HANA 1 the minimum required client version is 1.120.20
 
+            jodaTime:        "joda-time:joda-time:${jodaTimeVersion}",
+
             informix:        'com.ibm.informix:jdbc:4.10.7.20160517',
             jboss_jta:       "org.jboss.jbossts:jbossjta:4.16.4.Final",
             xapool:          "com.experlog:xapool:1.5.0",

hibernate-core/hibernate-core.gradle

@@ -69,7 +69,7 @@ dependencies {
     testCompile( libraries.classmate )
     testCompile( libraries.mockito )
     testCompile( libraries.mockito_inline )
-    testCompile( 'joda-time:joda-time:2.3' )
+    testCompile( libraries.jodaTime )
 
     testCompile( libraries.cdi ) {
         // we need to force it to make sure we influence the one coming from arquillian

hibernate-core/src/main/java/org/hibernate/boot/model/TypeContributions.java

@@ -7,6 +7,8 @@
 package org.hibernate.boot.model;
 
 import org.hibernate.type.BasicType;
+import org.hibernate.type.StandardBasicTypeTemplate;
+import org.hibernate.type.descriptor.java.spi.JavaTypeDescriptorRegistry;
 import org.hibernate.type.descriptor.sql.SqlTypeDescriptor;
 import org.hibernate.type.descriptor.java.JavaTypeDescriptor;
 import org.hibernate.type.spi.TypeConfiguration;
@@ -19,34 +21,56 @@ import org.hibernate.usertype.UserType;
  * @author Steve Ebersole
  */
 public interface TypeContributions {
+	TypeConfiguration getTypeConfiguration();
+
+	/**
+	 * Add the JavaTypeDescriptor to the {@link TypeConfiguration}'s
+	 * {@link JavaTypeDescriptorRegistry}
+	 */
+	void contributeJavaTypeDescriptor(JavaTypeDescriptor descriptor);
+
+	/**
+	 * Add the JavaTypeDescriptor to the {@link TypeConfiguration}'s
+	 * {@link JavaTypeDescriptorRegistry}
+	 */
+	void contributeSqlTypeDescriptor(SqlTypeDescriptor descriptor);
+
 	void contributeType(BasicType type);
 
 	/**
-	 * @deprecated (since 5.3) It will be replaced by {@link #contributeType(BasicType)}
+	 * @deprecated (since 5.3) Use {@link #contributeType(BasicType)} instead.  Basic
-	 * but do not move to it before 6.0
+	 * types will be defined and handled much differently in 6.0 based on a combination
+	 * of {@link JavaTypeDescriptor}, {@link SqlTypeDescriptor} and a concept of a "value
+	 * converter" (a JPA AttributeConverter, an enum value resolver, etc).  To get as
+	 * close as possible in 5.3 use existing {@link JavaTypeDescriptor} and
+	 * {@link SqlTypeDescriptor} implementations (or write your own for custom types)
+	 * and use {@link StandardBasicTypeTemplate} to combine those with
+	 * registration keys and call {@link #contributeType(BasicType)} instead
 	 */
 	@Deprecated
 	void contributeType(BasicType type, String... keys);
 
 	/**
-	 * @deprecated (since 5.3) It will be replaced by {@link #contributeType(BasicType)}
+	 * @deprecated (since 5.3) Use {@link #contributeType(BasicType)} instead.
-	 * but do not move to it before 6.0
+	 * {@link UserType}, as currently defined, will be done very differently in 6.0.
+	 * In most cases a {@link UserType} can be simply replaced with proper
+	 * {@link JavaTypeDescriptor}.  To get as close as possible to 6.0 in 5.3 use
+	 * existing {@link JavaTypeDescriptor} and {@link SqlTypeDescriptor}
+	 * implementations (or write your own for custom impls) and use
+	 * {@link StandardBasicTypeTemplate} to combine those with registration keys
+	 * and call {@link #contributeType(BasicType)} instead
 	 */
+	@Deprecated
 	void contributeType(UserType type, String... keys);
 
 	/**
-	 * @deprecated (since 5.3) It will be replaced by {@link #contributeType(BasicType)}
+	 * @deprecated (since 5.3) Use {@link #contributeType(BasicType)} instead.
-	 * but do not move to it before 6.0
+	 * {@link CompositeUserType}, as currently defined, will be done very differently
+	 * in 6.0.  {@link CompositeUserType} should be replaced with a normal Hibernate
+	 * component or JPA embeddable (different names, same thing.  This embeddable
+	 * may contain, in turn, custom types that should be handled as described on these
+	 * methods
 	 */
+	@Deprecated
 	void contributeType(CompositeUserType type, String... keys);
-
-	/*
-	 * Add the JavaTypeDescriptor to the
-	 * @param descriptor
-	 */
-	void contributeJavaTypeDescriptor(JavaTypeDescriptor descriptor);
-
-	void contributeSqlTypeDescriptor(SqlTypeDescriptor descriptor);
-
-	TypeConfiguration getTypeConfiguration();
 }

hibernate-core/src/main/java/org/hibernate/boot/model/convert/spi/JpaAttributeConverterCreationContext.java

@@ -7,7 +7,7 @@
 package org.hibernate.boot.model.convert.spi;
 
 import org.hibernate.resource.beans.spi.ManagedBeanRegistry;
-import org.hibernate.type.descriptor.java.JavaTypeDescriptorRegistry;
+import org.hibernate.type.descriptor.java.spi.JavaTypeDescriptorRegistry;
 
 /**
  * Access to information that implementors of

hibernate-core/src/main/java/org/hibernate/boot/registry/StandardServiceRegistryBuilder.java

@@ -64,7 +64,7 @@ public class StandardServiceRegistryBuilder {
 	 * @param bootstrapServiceRegistry Provided bootstrap registry to use.
 	 */
 	public StandardServiceRegistryBuilder(BootstrapServiceRegistry bootstrapServiceRegistry) {
-		this( bootstrapServiceRegistry,  LoadedConfig.baseline() );
+		this( bootstrapServiceRegistry, LoadedConfig.baseline() );
 	}
 
 	/**
@@ -72,7 +72,9 @@ public class StandardServiceRegistryBuilder {
 	 *
 	 * @param bootstrapServiceRegistry Provided bootstrap registry to use.
 	 */
-	public StandardServiceRegistryBuilder(BootstrapServiceRegistry bootstrapServiceRegistry, LoadedConfig loadedConfigBaseline) {
+	public StandardServiceRegistryBuilder(
+			BootstrapServiceRegistry bootstrapServiceRegistry,
+			LoadedConfig loadedConfigBaseline) {
 		this.settings = Environment.getProperties();
 		this.bootstrapServiceRegistry = bootstrapServiceRegistry;
 		this.configLoader = new ConfigLoader( bootstrapServiceRegistry );
@@ -103,7 +105,7 @@ public class StandardServiceRegistryBuilder {
 
 	/**
 	 * Read settings from a {@link java.util.Properties} file by resource name.
-	 *
+	 * <p>
 	 * Differs from {@link #configure()} and {@link #configure(String)} in that here we expect to read a
 	 * {@link java.util.Properties} file while for {@link #configure} we read the XML variant.
 	 *
@@ -114,7 +116,7 @@ public class StandardServiceRegistryBuilder {
 	 * @see #configure()
 	 * @see #configure(String)
 	 */
-	@SuppressWarnings( {"unchecked"})
+	@SuppressWarnings({"unchecked"})
 	public StandardServiceRegistryBuilder loadProperties(String resourceName) {
 		settings.putAll( configLoader.loadProperties( resourceName ) );
 		return this;
@@ -122,7 +124,7 @@ public class StandardServiceRegistryBuilder {
 
 	/**
 	 * Read settings from a {@link java.util.Properties} file by File reference
-	 *
+	 * <p>
 	 * Differs from {@link #configure()} and {@link #configure(String)} in that here we expect to read a
 	 * {@link java.util.Properties} file while for {@link #configure} we read the XML variant.
 	 *
@@ -133,7 +135,7 @@ public class StandardServiceRegistryBuilder {
 	 * @see #configure()
 	 * @see #configure(String)
 	 */
-	@SuppressWarnings( {"unchecked"})
+	@SuppressWarnings({"unchecked"})
 	public StandardServiceRegistryBuilder loadProperties(File file) {
 		settings.putAll( configLoader.loadProperties( file ) );
 		return this;
@@ -171,7 +173,7 @@ public class StandardServiceRegistryBuilder {
 		return configure( configLoader.loadConfigXmlUrl( url ) );
 	}
 
-	@SuppressWarnings( {"unchecked"})
+	@SuppressWarnings({"unchecked"})
 	public StandardServiceRegistryBuilder configure(LoadedConfig loadedConfig) {
 		aggregatedCfgXml.merge( loadedConfig );
 		settings.putAll( loadedConfig.getConfigurationValues() );
@@ -187,7 +189,7 @@ public class StandardServiceRegistryBuilder {
 	 *
 	 * @return this, for method chaining
 	 */
-	@SuppressWarnings( {"unchecked", "UnusedDeclaration"})
+	@SuppressWarnings({"unchecked", "UnusedDeclaration"})
 	public StandardServiceRegistryBuilder applySetting(String settingName, Object value) {
 		settings.put( settingName, value );
 		return this;
@@ -200,7 +202,7 @@ public class StandardServiceRegistryBuilder {
 	 *
 	 * @return this, for method chaining
 	 */
-	@SuppressWarnings( {"unchecked", "UnusedDeclaration"})
+	@SuppressWarnings({"unchecked", "UnusedDeclaration"})
 	public StandardServiceRegistryBuilder applySettings(Map settings) {
 		this.settings.putAll( settings );
 		return this;
@@ -213,7 +215,7 @@ public class StandardServiceRegistryBuilder {
 	 *
 	 * @return this, for method chaining
 	 */
-	@SuppressWarnings( {"UnusedDeclaration"})
+	@SuppressWarnings({"UnusedDeclaration"})
 	public StandardServiceRegistryBuilder addInitiator(StandardServiceInitiator initiator) {
 		initiators.add( initiator );
 		return this;
@@ -227,7 +229,7 @@ public class StandardServiceRegistryBuilder {
 	 *
 	 * @return this, for method chaining
 	 */
-	@SuppressWarnings( {"unchecked"})
+	@SuppressWarnings({"unchecked"})
 	public StandardServiceRegistryBuilder addService(final Class serviceRole, final Service service) {
 		providedServices.add( new ProvidedService( serviceRole, service ) );
 		return this;
@@ -289,9 +291,11 @@ public class StandardServiceRegistryBuilder {
 
 	@SuppressWarnings("deprecation")
 	private void applyServiceContributingIntegrators() {
-		for ( Integrator integrator : bootstrapServiceRegistry.getService( IntegratorService.class ).getIntegrators() ) {
+		for ( Integrator integrator : bootstrapServiceRegistry.getService( IntegratorService.class )
+				.getIntegrators() ) {
 			if ( org.hibernate.integrator.spi.ServiceContributingIntegrator.class.isInstance( integrator ) ) {
-				org.hibernate.integrator.spi.ServiceContributingIntegrator.class.cast( integrator ).prepareServices( this );
+				org.hibernate.integrator.spi.ServiceContributingIntegrator.class.cast( integrator ).prepareServices(
+						this );
 			}
 		}
 	}

hibernate-core/src/main/java/org/hibernate/mapping/SimpleValue.java

@@ -50,13 +50,13 @@ import org.hibernate.type.Type;
 import org.hibernate.type.descriptor.JdbcTypeNameMapper;
 import org.hibernate.type.descriptor.converter.AttributeConverterSqlTypeDescriptorAdapter;
 import org.hibernate.type.descriptor.converter.AttributeConverterTypeAdapter;
+import org.hibernate.type.descriptor.java.BasicJavaDescriptor;
 import org.hibernate.type.descriptor.java.JavaTypeDescriptor;
-import org.hibernate.type.descriptor.java.JavaTypeDescriptorRegistry;
+import org.hibernate.type.descriptor.spi.JdbcRecommendedSqlTypeMappingContext;
 import org.hibernate.type.descriptor.sql.JdbcTypeJavaClassMappings;
 import org.hibernate.type.descriptor.sql.LobTypeMappings;
 import org.hibernate.type.descriptor.sql.NationalizedTypeMappings;
 import org.hibernate.type.descriptor.sql.SqlTypeDescriptor;
-import org.hibernate.type.descriptor.sql.SqlTypeDescriptorRegistry;
 import org.hibernate.type.spi.TypeConfiguration;
 import org.hibernate.usertype.DynamicParameterizedType;
 
@@ -576,13 +576,13 @@ public class SimpleValue implements KeyValue {
 					}
 
 					@Override
-					public JavaTypeDescriptorRegistry getJavaTypeDescriptorRegistry() {
+					public org.hibernate.type.descriptor.java.spi.JavaTypeDescriptorRegistry getJavaTypeDescriptorRegistry() {
 						return metadata.getTypeConfiguration().getJavaTypeDescriptorRegistry();
 					}
 				}
 		);
 
-		final JavaTypeDescriptor entityAttributeJavaTypeDescriptor = jpaAttributeConverter.getDomainJavaTypeDescriptor();
+		final BasicJavaDescriptor entityAttributeJavaTypeDescriptor = jpaAttributeConverter.getDomainJavaTypeDescriptor();
 
 
 		// build the SqlTypeDescriptor adapter ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -591,7 +591,11 @@ public class SimpleValue implements KeyValue {
 		//		corresponding to the AttributeConverter's declared "databaseColumnJavaType" (how we read that value out
 		// 		of ResultSets).  See JdbcTypeJavaClassMappings for details.  Again, given example, this should return
 		// 		VARCHAR/CHAR
-		int jdbcTypeCode = JdbcTypeJavaClassMappings.INSTANCE.determineJdbcTypeCodeForJavaClass( jpaAttributeConverter.getRelationalJavaTypeDescriptor().getJavaType() );
+		final SqlTypeDescriptor recommendedSqlType = jpaAttributeConverter.getRelationalJavaTypeDescriptor().getJdbcRecommendedSqlType(
+				// todo (6.0) : handle the other JdbcRecommendedSqlTypeMappingContext methods
+				metadata::getTypeConfiguration
+		);
+		int jdbcTypeCode = recommendedSqlType.getSqlType();
 		if ( isLob() ) {
 			if ( LobTypeMappings.INSTANCE.hasCorrespondingLobCode( jdbcTypeCode ) ) {
 				jdbcTypeCode = LobTypeMappings.INSTANCE.getCorrespondingLobCode( jdbcTypeCode );

hibernate-core/src/main/java/org/hibernate/metamodel/model/convert/internal/JpaAttributeConverterImpl.java

@@ -10,6 +10,7 @@ import javax.persistence.AttributeConverter;
 
 import org.hibernate.metamodel.model.convert.spi.JpaAttributeConverter;
 import org.hibernate.resource.beans.spi.ManagedBean;
+import org.hibernate.type.descriptor.java.BasicJavaDescriptor;
 import org.hibernate.type.descriptor.java.JavaTypeDescriptor;
 
 /**
@@ -20,8 +21,8 @@ import org.hibernate.type.descriptor.java.JavaTypeDescriptor;
 public class JpaAttributeConverterImpl<O,R> implements JpaAttributeConverter<O,R> {
 	private final ManagedBean<AttributeConverter<O,R>> attributeConverterBean;
 	private final JavaTypeDescriptor<AttributeConverter<O, R>> converterJavaTypeDescriptor;
-	private final JavaTypeDescriptor<O> domainJavaTypeDescriptor;
+	private final BasicJavaDescriptor<O> domainJavaTypeDescriptor;
-	private final JavaTypeDescriptor<R> relationalJavaTypeDescriptor;
+	private final BasicJavaDescriptor<R> relationalJavaTypeDescriptor;
 
 	public JpaAttributeConverterImpl(
 			ManagedBean<AttributeConverter<O, R>> attributeConverterBean,
@@ -30,8 +31,13 @@ public class JpaAttributeConverterImpl<O,R> implements JpaAttributeConverter<O,R
 			JavaTypeDescriptor<R> relationalJavaTypeDescriptor) {
 		this.attributeConverterBean = attributeConverterBean;
 		this.converterJavaTypeDescriptor = converterJavaTypeDescriptor;
-		this.domainJavaTypeDescriptor = domainJavaTypeDescriptor;
+		this.domainJavaTypeDescriptor = (BasicJavaDescriptor<O>) domainJavaTypeDescriptor;
-		this.relationalJavaTypeDescriptor = relationalJavaTypeDescriptor;
+		this.relationalJavaTypeDescriptor = (BasicJavaDescriptor<R>) relationalJavaTypeDescriptor;
+	}
+
+	@Override
+	public ManagedBean<AttributeConverter<O, R>> getConverterBean() {
+		return attributeConverterBean;
 	}
 
 	@Override
@@ -50,12 +56,12 @@ public class JpaAttributeConverterImpl<O,R> implements JpaAttributeConverter<O,R
 	}
 
 	@Override
-	public JavaTypeDescriptor<O> getDomainJavaTypeDescriptor() {
+	public BasicJavaDescriptor<O> getDomainJavaTypeDescriptor() {
 		return domainJavaTypeDescriptor;
 	}
 
 	@Override
-	public JavaTypeDescriptor<R> getRelationalJavaTypeDescriptor() {
+	public BasicJavaDescriptor<R> getRelationalJavaTypeDescriptor() {
 		return relationalJavaTypeDescriptor;
 	}
 }

hibernate-core/src/main/java/org/hibernate/metamodel/model/convert/spi/JpaAttributeConverter.java

@@ -8,6 +8,8 @@ package org.hibernate.metamodel.model.convert.spi;
 
 import javax.persistence.AttributeConverter;
 
+import org.hibernate.resource.beans.spi.ManagedBean;
+import org.hibernate.type.descriptor.java.BasicJavaDescriptor;
 import org.hibernate.type.descriptor.java.JavaTypeDescriptor;
 
 /**
@@ -17,6 +19,9 @@ import org.hibernate.type.descriptor.java.JavaTypeDescriptor;
  */
 public interface JpaAttributeConverter<O,R> extends BasicValueConverter<O,R> {
 	JavaTypeDescriptor<AttributeConverter<O,R>> getConverterJavaTypeDescriptor();
-	JavaTypeDescriptor<O> getDomainJavaTypeDescriptor();
+
-	JavaTypeDescriptor<R> getRelationalJavaTypeDescriptor();
+	ManagedBean<AttributeConverter<O,R>> getConverterBean();
+
+	BasicJavaDescriptor<O> getDomainJavaTypeDescriptor();
+	BasicJavaDescriptor<R> getRelationalJavaTypeDescriptor();
 }

hibernate-core/src/main/java/org/hibernate/service/ServiceRegistry.java

@@ -11,7 +11,7 @@ package org.hibernate.service;
  *
  * @author Steve Ebersole
  */
-public interface ServiceRegistry {
+public interface ServiceRegistry extends AutoCloseable {
 	/**
 	 * Retrieve this registry's parent registry.
 	 * 
@@ -56,4 +56,6 @@ public interface ServiceRegistry {
 		return service;
 	}
 
+	@Override
+	void close();
 }

hibernate-core/src/main/java/org/hibernate/service/spi/ServiceRegistryImplementor.java

@@ -25,6 +25,11 @@ public interface ServiceRegistryImplementor extends ServiceRegistry {
 	 */
 	<R extends Service> ServiceBinding<R> locateServiceBinding(Class<R> serviceRole);
 
+	@Override
+	default void close() {
+		destroy();
+	}
+
 	/**
 	 * Release resources
 	 */

hibernate-core/src/main/java/org/hibernate/type/AbstractStandardBasicType.java

@@ -91,7 +91,7 @@ public abstract class AbstractStandardBasicType<T>
 	@Override
 	public String[] getRegistrationKeys() {
 		return registerUnderJavaType()
-				? new String[] { getName(), javaTypeDescriptor.getJavaTypeClass().getName() }
+				? new String[] { getName(), javaTypeDescriptor.getJavaType().getName() }
 				: new String[] { getName() };
 	}
 
@@ -128,7 +128,7 @@ public abstract class AbstractStandardBasicType<T>
 
 	@Override
 	public final Class getReturnedClass() {
-		return javaTypeDescriptor.getJavaTypeClass();
+		return javaTypeDescriptor.getJavaType();
 	}
 
 	@Override

hibernate-core/src/main/java/org/hibernate/type/BasicTypeRegistry.java

@@ -169,6 +169,12 @@ public class BasicTypeRegistry implements Serializable {
 		register( new CompositeCustomType( type, keys ) );
 	}
 
+	public void unregister(String... keys) {
+		for ( String key : keys ) {
+			registry.remove( key );
+		}
+	}
+
 	public BasicType getRegisteredType(String key) {
 		return registry.get( key );
 	}

hibernate-core/src/main/java/org/hibernate/type/PostgresUUIDType.java

@@ -16,11 +16,13 @@ import java.util.UUID;
 import org.hibernate.type.descriptor.ValueBinder;
 import org.hibernate.type.descriptor.ValueExtractor;
 import org.hibernate.type.descriptor.WrapperOptions;
+import org.hibernate.type.descriptor.java.BasicJavaDescriptor;
 import org.hibernate.type.descriptor.java.JavaTypeDescriptor;
 import org.hibernate.type.descriptor.java.UUIDTypeDescriptor;
 import org.hibernate.type.descriptor.sql.BasicBinder;
 import org.hibernate.type.descriptor.sql.BasicExtractor;
 import org.hibernate.type.descriptor.sql.SqlTypeDescriptor;
+import org.hibernate.type.spi.TypeConfiguration;
 
 /**
  * Specialized type mapping for {@link UUID} and the Postgres UUID data type (which is mapped as OTHER in its
@@ -59,6 +61,12 @@ public class PostgresUUIDType extends AbstractSingleColumnStandardBasicType<UUID
 			return true;
 		}
 
+		@Override
+		@SuppressWarnings("unchecked")
+		public BasicJavaDescriptor getJdbcRecommendedJavaTypeMapping(TypeConfiguration typeConfiguration) {
+			return (BasicJavaDescriptor) typeConfiguration.getJavaTypeDescriptorRegistry().getDescriptor( UUID.class );
+		}
+
 		public <X> ValueBinder<X> getBinder(final JavaTypeDescriptor<X> javaTypeDescriptor) {
 			return new BasicBinder<X>( javaTypeDescriptor, this ) {
 				@Override

hibernate-core/src/main/java/org/hibernate/type/descriptor/java/AbstractTypeDescriptor.java

@@ -16,9 +16,14 @@ import org.hibernate.internal.util.compare.EqualsHelper;
 /**
  * Abstract adapter for Java type descriptors.
  *
+ * @apiNote This abstract descriptor implements BasicJavaDescriptor
+ * because we currently only categorize "basic" JavaTypeDescriptors,
+ * as in the {@link javax.persistence.metamodel.Type.PersistenceType#BASIC}
+ * sense
+ *
  * @author Steve Ebersole
  */
-public abstract class AbstractTypeDescriptor<T> implements JavaTypeDescriptor<T>, Serializable {
+public abstract class AbstractTypeDescriptor<T> implements BasicJavaDescriptor<T>, Serializable {
 	private final Class<T> type;
 	private final MutabilityPlan<T> mutabilityPlan;
 	private final Comparator<T> comparator;

hibernate-core/src/main/java/org/hibernate/type/descriptor/java/BasicJavaDescriptor.java

@@ -0,0 +1,36 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.type.descriptor.java;
+
+import org.hibernate.type.descriptor.spi.JdbcRecommendedSqlTypeMappingContext;
+import org.hibernate.type.descriptor.sql.JdbcTypeJavaClassMappings;
+import org.hibernate.type.descriptor.sql.SqlTypeDescriptor;
+
+/**
+ * @apiNote Currently this is the only high-level categorization of
+ * JavaTypeDescriptor, but 6.0 will have specific JavaTypeDescriptor
+ * categorizations for managed-type, mapped-superclass, identifiable-type, entity, embeddable,
+ * collections.
+ *
+ * @author Steve Ebersole
+ */
+public interface BasicJavaDescriptor<T> extends JavaTypeDescriptor<T> {
+	/**
+	 * Obtain the "recommended" SQL type descriptor for this Java type.  The recommended
+	 * aspect comes from the JDBC spec (mostly).
+	 *
+	 * @param context Contextual information
+	 *
+	 * @return The recommended SQL type descriptor
+	 */
+	default SqlTypeDescriptor getJdbcRecommendedSqlType(JdbcRecommendedSqlTypeMappingContext context) {
+		// match legacy behavior
+		return context.getTypeConfiguration().getSqlTypeDescriptorRegistry().getDescriptor(
+				JdbcTypeJavaClassMappings.INSTANCE.determineJdbcTypeCodeForJavaClass( getJavaType() )
+		);
+	}
+}

hibernate-core/src/main/java/org/hibernate/type/descriptor/java/EnumJavaTypeDescriptor.java

@@ -15,7 +15,7 @@ import org.hibernate.type.descriptor.WrapperOptions;
  */
 public class EnumJavaTypeDescriptor<T extends Enum> extends AbstractTypeDescriptor<T> {
 	@SuppressWarnings("unchecked")
-	protected EnumJavaTypeDescriptor(Class<T> type) {
+	public EnumJavaTypeDescriptor(Class<T> type) {
 		super( type, ImmutableMutabilityPlan.INSTANCE );
 		//JavaTypeDescriptorRegistry.INSTANCE.addDescriptor( this );
 	}

hibernate-core/src/main/java/org/hibernate/type/descriptor/java/JavaTypeDescriptor.java

@@ -9,6 +9,8 @@ package org.hibernate.type.descriptor.java;
 import java.io.Serializable;
 import java.util.Comparator;
 
+import org.hibernate.internal.util.compare.ComparableComparator;
+import org.hibernate.internal.util.compare.EqualsHelper;
 import org.hibernate.type.descriptor.WrapperOptions;
 
 /**
@@ -37,17 +39,18 @@ public interface JavaTypeDescriptor<T> extends Serializable {
 
 	/**
 	 * Retrieve the mutability plan for this Java type.
-	 *
-	 * @return The mutability plan
 	 */
-	public MutabilityPlan<T> getMutabilityPlan();
+	@SuppressWarnings("unchecked")
+	default MutabilityPlan<T> getMutabilityPlan() {
+		return ImmutableMutabilityPlan.INSTANCE;
+	}
 
 	/**
 	 * Retrieve the natural comparator for this type.
-	 *
-	 * @return The natural comparator.
 	 */
-	public Comparator<T> getComparator();
+	default Comparator<T> getComparator() {
+		return Comparable.class.isAssignableFrom( Comparable.class ) ? ComparableComparator.INSTANCE : null;
+	}
 
 	/**
 	 * Extract a proper hash code for this value.
@@ -56,7 +59,12 @@ public interface JavaTypeDescriptor<T> extends Serializable {
 	 *
 	 * @return The extracted hash code.
 	 */
-	public int extractHashCode(T value);
+	default int extractHashCode(T value) {
+		if ( value == null ) {
+			throw new IllegalArgumentException( "Value to extract hashCode from cannot be null" );
+		}
+		return value.hashCode();
+	}
 
 	/**
 	 * Determine if two instances are equal
@@ -66,7 +74,9 @@ public interface JavaTypeDescriptor<T> extends Serializable {
 	 *
 	 * @return True if the two are considered equal; false otherwise.
 	 */
-	public boolean areEqual(T one, T another);
+	default boolean areEqual(T one, T another) {
+		return EqualsHelper.areEqual( one, another );
+	}
 
 	/**
 	 * Extract a loggable representation of the value.
@@ -75,11 +85,15 @@ public interface JavaTypeDescriptor<T> extends Serializable {
 	 *
 	 * @return The loggable representation
 	 */
-	public String extractLoggableRepresentation(T value);
+	default String extractLoggableRepresentation(T value) {
+		return toString( value );
+	}
 
-	public String toString(T value);
+	default String toString(T value) {
+		return value == null ? "null" : value.toString();
+	}
 
-	public T fromString(String string);
+	T fromString(String string);
 
 	/**
 	 * Unwrap an instance of our handled Java type into the requested type.
@@ -97,7 +111,7 @@ public interface JavaTypeDescriptor<T> extends Serializable {
 	 *
 	 * @return The unwrapped value.
 	 */
-	public <X> X unwrap(T value, Class<X> type, WrapperOptions options);
+	<X> X unwrap(T value, Class<X> type, WrapperOptions options);
 
 	/**
 	 * Wrap a value as our handled Java type.
@@ -110,5 +124,5 @@ public interface JavaTypeDescriptor<T> extends Serializable {
 	 *
 	 * @return The wrapped value.
 	 */
-	public <X> T wrap(X value, WrapperOptions options);
+	<X> T wrap(X value, WrapperOptions options);
 }

hibernate-core/src/main/java/org/hibernate/type/descriptor/java/JavaTypeDescriptorRegistry.java

@@ -7,7 +7,6 @@
 package org.hibernate.type.descriptor.java;
 
 import java.io.Serializable;
-import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
 import org.hibernate.HibernateException;
@@ -16,6 +15,7 @@ import org.hibernate.internal.CoreLogging;
 import org.hibernate.internal.CoreMessageLogger;
 import org.hibernate.internal.util.ReflectHelper;
 import org.hibernate.type.descriptor.WrapperOptions;
+import org.hibernate.type.descriptor.java.spi.RegistryHelper;
 import org.hibernate.type.spi.TypeConfiguration;
 
 /**
@@ -84,8 +84,7 @@ public class JavaTypeDescriptorRegistry implements Serializable {
 	}
 
 	private JavaTypeDescriptor addDescriptorInternal(JavaTypeDescriptor descriptor) {
-		JavaTypeDescriptor javaTypeDescriptor = descriptorsByClass.put( descriptor.getJavaType(), descriptor );
+		return descriptorsByClass.put( descriptor.getJavaType(), descriptor );
-		return javaTypeDescriptor;
 	}
 
 	/**
@@ -113,43 +112,26 @@ public class JavaTypeDescriptorRegistry implements Serializable {
 	 */
 	@Deprecated
 	@SuppressWarnings("unchecked")
-	public <T> JavaTypeDescriptor<T> getDescriptor(Class<T> cls) {
+	public <J> JavaTypeDescriptor<J> getDescriptor(Class<J> cls) {
-		if ( cls == null ) {
+		return RegistryHelper.INSTANCE.resolveDescriptor(
-			throw new IllegalArgumentException( "Class passed to locate Java type descriptor cannot be null" );
+				descriptorsByClass,
-		}
+				cls,
+				() -> {
+					if ( Serializable.class.isAssignableFrom( cls ) ) {
+						return new SerializableTypeDescriptor( cls );
+					}
 
-		JavaTypeDescriptor<T> descriptor = descriptorsByClass.get( cls );
+					log.debugf(
-		if ( descriptor != null ) {
+							"Could not find matching JavaTypeDescriptor for requested Java class [%s]; using fallback.  " +
-			return descriptor;
+									"This means Hibernate does not know how to perform certain basic operations in relation to this Java type." +
-		}
+									"",
+							cls.getName()
+					);
+					checkEqualsAndHashCode( cls );
 
-		if ( cls.isEnum() ) {
+					return new FallbackJavaTypeDescriptor<>( cls );
-			descriptor = new EnumJavaTypeDescriptor( cls );
+				}
-			descriptorsByClass.put( cls, descriptor );
-			return descriptor;
-		}
-
-		// find the first "assignable" match
-		for ( Map.Entry<Class, JavaTypeDescriptor> entry : descriptorsByClass.entrySet() ) {
-			if ( entry.getKey().isAssignableFrom( cls ) ) {
-				log.debugf( "Using  cached JavaTypeDescriptor instance for Java class [%s]", cls.getName() );
-				return entry.getValue();
-			}
-		}
-
-		if ( Serializable.class.isAssignableFrom( cls ) ) {
-			return new SerializableTypeDescriptor( cls );
-		}
-
-		log.debugf(
-				"Could not find matching JavaTypeDescriptor for requested Java class [%s]; using fallback.  " +
-						"This means Hibernate does not know how to perform certain basic operations in relation to this Java type." +
-						"",
-				cls.getName()
 		);
-		checkEqualsAndHashCode( cls );
-
-		return new FallbackJavaTypeDescriptor<>( cls );
 	}
 
 	@SuppressWarnings("unchecked")

hibernate-core/src/main/java/org/hibernate/type/descriptor/java/SerializableTypeDescriptor.java

@@ -29,11 +29,9 @@ public class SerializableTypeDescriptor<T extends Serializable> extends Abstract
 
 	// unfortunately the param types cannot be the same so use something other than 'T' here to make that obvious
 	public static class SerializableMutabilityPlan<S extends Serializable> extends MutableMutabilityPlan<S> {
+		public static final SerializableMutabilityPlan<Serializable> INSTANCE = new SerializableMutabilityPlan<>();
 
-		public static final SerializableMutabilityPlan<Serializable> INSTANCE
+		private SerializableMutabilityPlan() {
-				= new SerializableMutabilityPlan<Serializable>( );
-
-		public SerializableMutabilityPlan() {
 		}
 
 		@Override
@@ -124,7 +122,7 @@ public class SerializableTypeDescriptor<T extends Serializable> extends Abstract
 				throw new HibernateException( e );
 			}
 		}
-		else if ( getJavaTypeClass().isInstance( value ) ) {
+		else if ( getJavaType().isInstance( value ) ) {
 			return (T) value;
 		}
 		throw unknownWrap( value.getClass() );
@@ -136,6 +134,6 @@ public class SerializableTypeDescriptor<T extends Serializable> extends Abstract
 
 	@SuppressWarnings({ "unchecked" })
 	protected T fromBytes(byte[] bytes) {
-		return (T) SerializationHelper.deserialize( bytes, getJavaTypeClass().getClassLoader() );
+		return (T) SerializationHelper.deserialize( bytes, getJavaType().getClassLoader() );
 	}
 }

hibernate-core/src/main/java/org/hibernate/type/descriptor/java/spi/JavaTypeDescriptorRegistry.java

@@ -7,10 +7,13 @@
 package org.hibernate.type.descriptor.java.spi;
 
 import java.io.Serializable;
+import java.util.concurrent.ConcurrentHashMap;
 
 import org.hibernate.type.descriptor.java.JavaTypeDescriptor;
 import org.hibernate.type.spi.TypeConfiguration;
 
+import org.jboss.logging.Logger;
+
 /**
  * Basically a map from {@link Class} -> {@link JavaTypeDescriptor}
  *
@@ -19,25 +22,41 @@ import org.hibernate.type.spi.TypeConfiguration;
  *
  * @since 5.3
  */
-public class JavaTypeDescriptorRegistry
+public class JavaTypeDescriptorRegistry implements Serializable {
-		extends org.hibernate.type.descriptor.java.JavaTypeDescriptorRegistry
+	private static final Logger log = Logger.getLogger( JavaTypeDescriptorRegistry.class );
-		implements Serializable {
 
-	private final TypeConfiguration typeConfiguration;
-	private final org.hibernate.type.descriptor.java.JavaTypeDescriptorRegistry javaTypeDescriptorRegistry;
 
+	private ConcurrentHashMap<Class, JavaTypeDescriptor> descriptorsByClass = new ConcurrentHashMap<>();
+
+	@SuppressWarnings("unused")
 	public JavaTypeDescriptorRegistry(TypeConfiguration typeConfiguration) {
-		this.typeConfiguration = typeConfiguration;
-		javaTypeDescriptorRegistry = org.hibernate.type.descriptor.java.JavaTypeDescriptorRegistry.INSTANCE;
 	}
 
-	@Override
 	public <T> JavaTypeDescriptor<T> getDescriptor(Class<T> javaType) {
-		return javaTypeDescriptorRegistry.getDescriptor( javaType );
+		return RegistryHelper.INSTANCE.resolveDescriptor(
+				descriptorsByClass,
+				javaType,
+				() -> {
+					log.debugf(
+							"Could not find matching scoped JavaTypeDescriptor for requested Java class [%s]; " +
+									"falling back to static registry",
+							javaType.getName()
+					);
+
+					return org.hibernate.type.descriptor.java.JavaTypeDescriptorRegistry.INSTANCE.getDescriptor( javaType );
+				}
+		);
 	}
 
-	@Override
 	public void addDescriptor(JavaTypeDescriptor descriptor) {
-		javaTypeDescriptorRegistry.addDescriptor( descriptor );
+		JavaTypeDescriptor old = descriptorsByClass.put( descriptor.getJavaType(), descriptor );
+		if ( old != null ) {
+			log.debugf(
+					"JavaTypeDescriptorRegistry entry replaced : %s -> %s (was %s)",
+					descriptor.getJavaType(),
+					descriptor,
+					old
+			);
+		}
 	}
 }

hibernate-core/src/main/java/org/hibernate/type/descriptor/java/spi/RegistryHelper.java

@@ -0,0 +1,63 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.type.descriptor.java.spi;
+
+import java.io.Serializable;
+import java.util.Map;
+import java.util.function.Supplier;
+
+import org.hibernate.type.descriptor.java.EnumJavaTypeDescriptor;
+import org.hibernate.type.descriptor.java.JavaTypeDescriptor;
+import org.hibernate.type.descriptor.java.SerializableTypeDescriptor;
+
+import org.jboss.logging.Logger;
+
+/**
+ * @author Steve Ebersole
+ */
+public class RegistryHelper {
+	private static final Logger log = Logger.getLogger( RegistryHelper.class );
+
+	/**
+	 * Singleton access
+	 */
+	public static final RegistryHelper INSTANCE = new RegistryHelper();
+
+	private RegistryHelper() {
+	}
+
+	@SuppressWarnings("unchecked")
+	public <J> JavaTypeDescriptor<J> resolveDescriptor(
+			Map<Class,JavaTypeDescriptor> descriptorsByClass,
+			Class<J> cls,
+			Supplier<JavaTypeDescriptor<J>> defaultValueSupplier) {
+		if ( cls == null ) {
+			throw new IllegalArgumentException( "Class passed to locate JavaTypeDescriptor cannot be null" );
+		}
+
+		JavaTypeDescriptor<J> descriptor = descriptorsByClass.get( cls );
+		if ( descriptor != null ) {
+			return descriptor;
+		}
+
+		if ( cls.isEnum() ) {
+			descriptor = new EnumJavaTypeDescriptor( cls );
+			descriptorsByClass.put( cls, descriptor );
+			return descriptor;
+		}
+
+		// find the first "assignable" match
+		for ( Map.Entry<Class, JavaTypeDescriptor> entry : descriptorsByClass.entrySet() ) {
+			if ( entry.getKey().isAssignableFrom( cls ) ) {
+				log.debugf( "Using  cached JavaTypeDescriptor instance for Java class [%s]", cls.getName() );
+				return entry.getValue();
+			}
+		}
+
+		return defaultValueSupplier.get();
+	}
+}

hibernate-core/src/main/java/org/hibernate/type/descriptor/spi/JdbcRecommendedSqlTypeMappingContext.java

@@ -0,0 +1,64 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.type.descriptor.spi;
+
+import java.sql.Types;
+import javax.persistence.EnumType;
+
+import org.hibernate.type.spi.TypeConfiguration;
+
+/**
+ * More-or-less a parameter-object intended for use in determining the SQL/JDBC type recommended
+ * by the JDBC spec (explicitly or implicitly) for a given Java type.
+ *
+ * @see org.hibernate.type.descriptor.java.BasicJavaDescriptor#getJdbcRecommendedSqlType
+ *
+ * @author Steve Ebersole
+ */
+public interface JdbcRecommendedSqlTypeMappingContext {
+	/**
+	 * Was nationalized character datatype requested for the given Java type?
+	 *
+	 * @return {@code true} if nationalized character datatype should be used; {@code false} otherwise.
+	 */
+	default boolean isNationalized() {
+		return false;
+	}
+
+	/**
+	 * Was LOB datatype requested for the given Java type?
+	 *
+	 * @return {@code true} if LOB datatype should be used; {@code false} otherwise.
+	 */
+	default boolean isLob() {
+		return false;
+	}
+
+	/**
+	 * For enum mappings, what style of storage was requested (name vs. ordinal)?
+	 *
+	 * @return The enum type.
+	 */
+	default EnumType getEnumeratedType() {
+		return EnumType.ORDINAL;
+	}
+
+	/**
+	 * When mapping a boolean type to the database what is the preferred SQL type code to use?
+	 * <p/>
+	 * Specifically names the key into the
+	 * {@link org.hibernate.type.descriptor.sql.spi.SqlTypeDescriptorRegistry}.
+	 */
+	default int getPreferredSqlTypeCodeForBoolean() {
+		return Types.BOOLEAN;
+	}
+
+	/**
+	 * Provides access to the TypeConfiguration for access to various type-system registries.
+	 */
+	TypeConfiguration getTypeConfiguration();
+}

hibernate-core/src/main/java/org/hibernate/type/descriptor/sql/SqlTypeDescriptor.java

@@ -10,7 +10,9 @@ import java.io.Serializable;
 
 import org.hibernate.type.descriptor.ValueBinder;
 import org.hibernate.type.descriptor.ValueExtractor;
+import org.hibernate.type.descriptor.java.BasicJavaDescriptor;
 import org.hibernate.type.descriptor.java.JavaTypeDescriptor;
+import org.hibernate.type.spi.TypeConfiguration;
 
 /**
  * Descriptor for the <tt>SQL</tt>/<tt>JDBC</tt> side of a value mapping.
@@ -38,6 +40,15 @@ public interface SqlTypeDescriptor extends Serializable {
 	 */
 	boolean canBeRemapped();
 
+	@SuppressWarnings("unchecked")
+	default <T> BasicJavaDescriptor<T> getJdbcRecommendedJavaTypeMapping(TypeConfiguration typeConfiguration) {
+		// match legacy behavior
+		return (BasicJavaDescriptor<T>) typeConfiguration.getJavaTypeDescriptorRegistry().getDescriptor(
+				JdbcTypeJavaClassMappings.INSTANCE.determineJavaClassForJdbcTypeCode( getSqlType() )
+		);
+
+	}
+
 	/**
 	 * Get the binder (setting JDBC in-going parameter values) capable of handling values of the type described by the
 	 * passed descriptor.

hibernate-core/src/main/java/org/hibernate/type/descriptor/sql/SqlTypeDescriptorRegistry.java

@@ -151,7 +151,7 @@ public class SqlTypeDescriptorRegistry implements Serializable {
 
 		@Override
 		public <X> ValueBinder<X> getBinder(JavaTypeDescriptor<X> javaTypeDescriptor) {
-			if ( Serializable.class.isAssignableFrom( javaTypeDescriptor.getJavaTypeClass() ) ) {
+			if ( Serializable.class.isAssignableFrom( javaTypeDescriptor.getJavaType() ) ) {
 				return VarbinaryTypeDescriptor.INSTANCE.getBinder( javaTypeDescriptor );
 			}
 
@@ -173,7 +173,7 @@ public class SqlTypeDescriptorRegistry implements Serializable {
 		@Override
 		@SuppressWarnings("unchecked")
 		public ValueExtractor getExtractor(JavaTypeDescriptor javaTypeDescriptor) {
-			if ( Serializable.class.isAssignableFrom( javaTypeDescriptor.getJavaTypeClass() ) ) {
+			if ( Serializable.class.isAssignableFrom( javaTypeDescriptor.getJavaType() ) ) {
 				return VarbinaryTypeDescriptor.INSTANCE.getExtractor( javaTypeDescriptor );
 			}
 

hibernate-core/src/test/java/org/hibernate/test/converter/custom/CustomTypeConverterTest.java

@@ -0,0 +1,95 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.test.converter.custom;
+
+import org.hibernate.boot.MetadataSources;
+import org.hibernate.boot.registry.StandardServiceRegistry;
+import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
+import org.hibernate.boot.spi.MetadataBuilderImplementor;
+import org.hibernate.cfg.AvailableSettings;
+import org.hibernate.engine.spi.SessionFactoryImplementor;
+import org.hibernate.persister.entity.EntityPersister;
+import org.hibernate.tool.schema.Action;
+import org.hibernate.type.spi.TypeConfiguration;
+
+import org.hibernate.testing.junit4.BaseUnitTestCase;
+import org.junit.Test;
+
+import static org.hamcrest.CoreMatchers.sameInstance;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+/**
+ * @author Steve Ebersole
+ */
+public class CustomTypeConverterTest extends BaseUnitTestCase {
+	@Test
+	public void testConverterAppliedStaticRegistration() {
+		// this is how we told users to do it previously using the static reference -
+		//		make sure it still works for now
+		org.hibernate.type.descriptor.java.JavaTypeDescriptorRegistry.INSTANCE.addDescriptor( MyCustomJavaTypeDescriptor.INSTANCE );
+		org.hibernate.type.descriptor.sql.SqlTypeDescriptorRegistry.INSTANCE.addDescriptor( MyCustomSqlTypeDescriptor.INSTANCE );
+
+		try ( final StandardServiceRegistry ssr = new StandardServiceRegistryBuilder()
+				.applySetting( AvailableSettings.HBM2DDL_AUTO, Action.CREATE_DROP )
+				.build() ) {
+			final MetadataSources metadataSources = new MetadataSources( ssr )
+					.addAnnotatedClass( MyCustomConverter.class )
+					.addAnnotatedClass( MyEntity.class );
+			final MetadataBuilderImplementor metadataBuilder = (MetadataBuilderImplementor) metadataSources.getMetadataBuilder();
+
+			final TypeConfiguration bootTypeConfiguration = metadataBuilder.getBootstrapContext().getTypeConfiguration();
+			performAssertions( metadataBuilder, bootTypeConfiguration );
+
+		}
+	}
+
+	@Test
+	public void testConverterAppliedScopedRegistration() {
+
+		try ( final StandardServiceRegistry ssr = new StandardServiceRegistryBuilder()
+				.applySetting( AvailableSettings.HBM2DDL_AUTO, Action.CREATE_DROP )
+				.build() ) {
+			final MetadataSources metadataSources = new MetadataSources( ssr )
+					.addAnnotatedClass( MyCustomConverter.class )
+					.addAnnotatedClass( MyEntity.class );
+			final MetadataBuilderImplementor metadataBuilder = (MetadataBuilderImplementor) metadataSources.getMetadataBuilder();
+
+			// now the new scoped way
+			final TypeConfiguration bootTypeConfiguration = metadataBuilder.getBootstrapContext().getTypeConfiguration();
+			bootTypeConfiguration.getJavaTypeDescriptorRegistry()
+					.addDescriptor( MyCustomJavaTypeDescriptor.INSTANCE );
+			bootTypeConfiguration.getSqlTypeDescriptorRegistry()
+					.addDescriptor( MyCustomSqlTypeDescriptor.INSTANCE );
+
+			performAssertions( metadataBuilder, bootTypeConfiguration );
+		}
+	}
+
+	protected void performAssertions(
+			MetadataBuilderImplementor metadataBuilder,
+			TypeConfiguration bootTypeConfiguration) {
+		try ( final SessionFactoryImplementor sessionFactory = (SessionFactoryImplementor) metadataBuilder.build().buildSessionFactory()) {
+			assertThat(
+					sessionFactory.getMetamodel().getTypeConfiguration(),
+					sameInstance( bootTypeConfiguration )
+			);
+
+			assertThat(
+					bootTypeConfiguration.getJavaTypeDescriptorRegistry().getDescriptor( MyCustomJavaType.class ),
+					sameInstance( MyCustomJavaTypeDescriptor.INSTANCE )
+			);
+
+			assertThat(
+					bootTypeConfiguration.getSqlTypeDescriptorRegistry().getDescriptor( MyCustomSqlTypeDescriptor.INSTANCE.getSqlType() ),
+					sameInstance( MyCustomSqlTypeDescriptor.INSTANCE )
+			);
+
+			final EntityPersister entityPersister = sessionFactory.getMetamodel().entityPersister( MyEntity.class );
+			entityPersister.getPropertyType( "customType" );
+		}
+	}
+}

hibernate-core/src/test/java/org/hibernate/test/converter/custom/MyCustomConverter.java

@@ -0,0 +1,26 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.test.converter.custom;
+
+import javax.persistence.AttributeConverter;
+import javax.persistence.Converter;
+
+/**
+ * @author Steve Ebersole
+ */
+@Converter( autoApply = true )
+public class MyCustomConverter implements AttributeConverter<MyCustomJavaType, String> {
+	@Override
+	public String convertToDatabaseColumn(MyCustomJavaType attribute) {
+		return null;
+	}
+
+	@Override
+	public MyCustomJavaType convertToEntityAttribute(String dbData) {
+		return null;
+	}
+}

hibernate-core/src/test/java/org/hibernate/test/converter/custom/MyCustomJavaType.java

@@ -0,0 +1,43 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.test.converter.custom;
+
+/**
+ * @author Steve Ebersole
+ */
+public class MyCustomJavaType implements Comparable<MyCustomJavaType> {
+	private String payload;
+
+	public MyCustomJavaType() {
+		this( null );
+	}
+
+	public MyCustomJavaType(String payload) {
+		this.payload = payload;
+	}
+
+	public String getPayload() {
+		return payload;
+	}
+
+	public void setPayload(String payload) {
+		this.payload = payload;
+	}
+
+	@Override
+	public int compareTo(MyCustomJavaType other) {
+		if ( getPayload() == null ) {
+			return -1;
+		}
+
+		if ( other == null || other.getPayload() == null ) {
+			return 1;
+		}
+
+		return getPayload().compareTo( other.getPayload() );
+	}
+}

hibernate-core/src/test/java/org/hibernate/test/converter/custom/MyCustomJavaTypeDescriptor.java

@@ -0,0 +1,77 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.test.converter.custom;
+
+import org.hibernate.internal.util.StringHelper;
+import org.hibernate.type.descriptor.WrapperOptions;
+import org.hibernate.type.descriptor.java.BasicJavaDescriptor;
+import org.hibernate.type.descriptor.java.JavaTypeDescriptor;
+import org.hibernate.type.descriptor.java.MutabilityPlan;
+import org.hibernate.type.descriptor.java.MutableMutabilityPlan;
+import org.hibernate.type.descriptor.spi.JdbcRecommendedSqlTypeMappingContext;
+import org.hibernate.type.descriptor.sql.SqlTypeDescriptor;
+
+/**
+ * @author Steve Ebersole
+ */
+public class MyCustomJavaTypeDescriptor implements BasicJavaDescriptor<MyCustomJavaType> {
+	/**
+	 * Singleton access
+	 */
+	public static final MyCustomJavaTypeDescriptor INSTANCE = new MyCustomJavaTypeDescriptor();
+
+	private final MutableMutabilityPlan<MyCustomJavaType> mutabilityPlan = new MutableMutabilityPlan<MyCustomJavaType>() {
+		@Override
+		protected MyCustomJavaType deepCopyNotNull(MyCustomJavaType value) {
+			return value == null ? null : new MyCustomJavaType( value.getPayload() );
+		}
+	};
+
+	private MyCustomJavaTypeDescriptor() {
+	}
+
+	@Override
+	public Class getJavaTypeClass() {
+		return MyCustomJavaType.class;
+	}
+
+	@Override
+	public SqlTypeDescriptor getJdbcRecommendedSqlType(JdbcRecommendedSqlTypeMappingContext context) {
+		return MyCustomSqlTypeDescriptor.INSTANCE;
+	}
+
+	@Override
+	public MutabilityPlan getMutabilityPlan() {
+		return mutabilityPlan;
+	}
+
+	@Override
+	public MyCustomJavaType fromString(String string) {
+		return StringHelper.isEmpty( string ) ? null : new MyCustomJavaType( string );
+	}
+
+	@Override
+	public MyCustomJavaType wrap(Object value, WrapperOptions options) {
+		if ( value == null ) {
+			return null;
+		}
+		else if ( String.class.isInstance( value ) ) {
+			return new MyCustomJavaType( (String) value );
+		}
+
+		throw new UnsupportedOperationException( "Wrapping value as MyCustomJavaType only supported for String or MyCustomJdbcType : " + value );
+	}
+
+	@Override
+	public Object unwrap(MyCustomJavaType value, Class type, WrapperOptions options) {
+		if ( String.class.isAssignableFrom( type ) ) {
+			return value.getPayload();
+		}
+
+		throw new UnsupportedOperationException( "Unwrapping MyCustomJavaType value only supported for String or MyCustomJdbcType : " + value );
+	}
+}

hibernate-core/src/test/java/org/hibernate/test/converter/custom/MyCustomSqlTypeDescriptor.java

@@ -0,0 +1,83 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.test.converter.custom;
+
+import java.sql.CallableStatement;
+import java.sql.PreparedStatement;
+import java.sql.SQLException;
+import java.sql.Types;
+
+import org.hibernate.type.descriptor.ValueBinder;
+import org.hibernate.type.descriptor.ValueExtractor;
+import org.hibernate.type.descriptor.WrapperOptions;
+import org.hibernate.type.descriptor.java.JavaTypeDescriptor;
+import org.hibernate.type.descriptor.sql.BasicBinder;
+import org.hibernate.type.descriptor.sql.SqlTypeDescriptor;
+import org.hibernate.type.descriptor.sql.VarcharTypeDescriptor;
+
+/**
+ * A custom SqlTypeDescriptor.  For example, this might be used to provide support
+ * for a "non-standard" SQL type or to provide some special handling of values (e.g.
+ * Oracle's dodgy handling of `""` as `null` but only in certain uses).
+ *
+ * This descriptor shows an example of replacing how VARCHAR values are handled.
+ *
+ * @author Steve Ebersole
+ */
+public class MyCustomSqlTypeDescriptor implements SqlTypeDescriptor {
+	/**
+	 * Singleton access
+	 */
+	public static final MyCustomSqlTypeDescriptor INSTANCE = new MyCustomSqlTypeDescriptor();
+
+	private MyCustomSqlTypeDescriptor() {
+	}
+
+	@Override
+	public int getSqlType() {
+		// given the Oracle example above we might want to replace the
+		// handling of VARCHAR
+		return Types.VARCHAR;
+	}
+
+	@Override
+	public boolean canBeRemapped() {
+		return false;
+	}
+
+	@Override
+	public <X> ValueBinder<X> getBinder(JavaTypeDescriptor<X> javaTypeDescriptor) {
+		return new BasicBinder<X>( javaTypeDescriptor, this ) {
+			@Override
+			protected void doBind(PreparedStatement st, X value, int index, WrapperOptions options) throws SQLException {
+				final String valueStr = javaTypeDescriptor.unwrap( value, String.class, options );
+				if ( valueStr == null || valueStr.trim().isEmpty() ) {
+					st.setNull( index, getSqlType() );
+				}
+				else {
+					st.setString( index, valueStr );
+				}
+			}
+
+			@Override
+			protected void doBind(CallableStatement st, X value, String name, WrapperOptions options) throws SQLException {
+				final String valueStr = javaTypeDescriptor.unwrap( value, String.class, options );
+				if ( valueStr == null || valueStr.trim().isEmpty() ) {
+					st.setNull( name, getSqlType() );
+				}
+				else {
+					st.setString( name, valueStr );
+				}
+			}
+		};
+	}
+
+	@Override
+	public <X> ValueExtractor<X> getExtractor(JavaTypeDescriptor<X> javaTypeDescriptor) {
+		return VarcharTypeDescriptor.INSTANCE.getExtractor( javaTypeDescriptor );
+	}
+}

hibernate-core/src/test/java/org/hibernate/test/converter/custom/MyEntity.java

@@ -0,0 +1,50 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.test.converter.custom;
+
+import javax.persistence.Basic;
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.Table;
+
+/**
+ * @author Steve Ebersole
+ */
+@Entity
+@Table( name = "CUST_TYPE_CONV_ENTITY")
+public class MyEntity {
+	private Integer id;
+	private MyCustomJavaType customType;
+
+	public MyEntity() {
+	}
+
+	public MyEntity(Integer id, MyCustomJavaType customType) {
+		this.id = id;
+		this.customType = customType;
+	}
+
+	@Id
+	public Integer getId() {
+		return id;
+	}
+
+	public void setId(Integer id) {
+		this.id = id;
+	}
+
+	// NOTE : this AttributeConverter should be auto-applied here
+
+	@Basic
+	public MyCustomJavaType getCustomType() {
+		return customType;
+	}
+
+	public void setCustomType(MyCustomJavaType customType) {
+		this.customType = customType;
+	}
+}

hibernate-core/src/test/java/org/hibernate/test/converter/custom/package-info.java

@@ -0,0 +1,12 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+
+/**
+ * Test illustrating use of an AttributeConverter over custom
+ * java / sql type descriptors
+ */
+package org.hibernate.test.converter.custom;

hibernate-core/src/test/java/org/hibernate/test/type/Java8DateTimeTests.java

@@ -83,7 +83,7 @@ public class Java8DateTimeTests extends BaseNonConfigCoreFunctionalTestCase {
 					String.format(
 							"%s (%s) -> %s",
 							propertyBinding.getName(),
-							javaTypeDescriptor.getJavaTypeClass().getSimpleName(),
+							javaTypeDescriptor.getJavaType().getSimpleName(),
 							javaTypeDescriptor.toString( propertyBinding.getGetter( TheEntity.class ).get( theEntity ) )
 					)
 			);

hibernate-spatial/hibernate-spatial.gradle

@@ -1,3 +1,5 @@
+import org.apache.tools.ant.filters.ReplaceTokens
+
 /*
  * Hibernate, Relational Persistence for Idiomatic Java
  *
@@ -8,13 +10,27 @@
 apply from: rootProject.file( 'gradle/published-java-module.gradle' )
 apply plugin: 'hibernate-matrix-testing'
 
+ext {
+	db = project.hasProperty('db') ? project.getProperty('db') : 'h2'
+	dbBundle = [
+			h2 : [
+					'db.dialect' : 'org.hibernate.spatial.dialect.h2geodb.GeoDBDialect',
+					'jdbc.driver': 'org.h2.Driver',
+					'jdbc.user'  : 'sa',
+					'jdbc.pass'  : '',
+					'jdbc.url'   : 'jdbc:h2:mem:db1;DB_CLOSE_DELAY=-1;LOCK_TIMEOUT=10000',
+			]
+	]
+}
+
 description = 'Integrate support for Spatial/GIS data into Hibernate O/RM'
 
 dependencies {
-    compile(project(':hibernate-core'))
+    compile( project(':hibernate-core') )
+    compile( libraries.geolatte )
+
+    compile( 'org.postgresql:postgresql:42.1.4' )
 
-    compile('org.postgresql:postgresql:42.1.4')
-    compile([group: 'org.geolatte', name: 'geolatte-geom', version: '1.3.0'])
     compile(libraries.dom4j) {
         transitive = false
     }
@@ -40,3 +56,25 @@ sourceSets.test.resources {
     setSrcDirs(['src/test/java', 'src/test/resources'])
 }
 
+processTestResources {
+	doLast {
+		copy {
+			from( sourceSets.test.java.srcDirs ) {
+				include '**/*.properties'
+				include '**/*.xml'
+			}
+			into sourceSets.test.java.outputDir
+		}
+		copy {
+			from file( 'src/test/resources' )
+			into file( "${buildDir}/resources/test" )
+			exclude 'src/test/resources/arquillian.xml'
+			exclude 'src/test/resources/hibernate.properties'
+		}
+		copy {
+			from file( 'src/test/resources/hibernate.properties' )
+			into file( "${buildDir}/resources/test" )
+			filter( ReplaceTokens, tokens: dbBundle[db] )
+		}
+	}
+}

hibernate-spatial/src/main/java/org/hibernate/spatial/GeolatteGeometryJavaTypeDescriptor.java

@@ -7,9 +7,12 @@
 
 package org.hibernate.spatial;
 
+import java.sql.Types;
+
 import org.hibernate.type.descriptor.WrapperOptions;
 import org.hibernate.type.descriptor.java.AbstractTypeDescriptor;
-import org.hibernate.type.descriptor.java.JavaTypeDescriptorRegistry;
+import org.hibernate.type.descriptor.spi.JdbcRecommendedSqlTypeMappingContext;
+import org.hibernate.type.descriptor.sql.SqlTypeDescriptor;
 
 import org.geolatte.geom.Geometry;
 import org.geolatte.geom.codec.Wkt;
@@ -35,6 +38,11 @@ public class GeolatteGeometryJavaTypeDescriptor extends AbstractTypeDescriptor<G
 		super( Geometry.class );
 	}
 
+	@Override
+	public SqlTypeDescriptor getJdbcRecommendedSqlType(JdbcRecommendedSqlTypeMappingContext context) {
+		return context.getTypeConfiguration().getSqlTypeDescriptorRegistry().getDescriptor( Types.ARRAY );
+	}
+
 	@Override
 	public String toString(Geometry value) {
 		return value.toString();

hibernate-spatial/src/main/java/org/hibernate/spatial/GeolatteGeometryType.java

@@ -27,6 +27,18 @@ import org.geolatte.geom.Polygon;
  */
 public class GeolatteGeometryType extends AbstractSingleColumnStandardBasicType<Geometry> implements Spatial {
 
+	public static final String[] REG_KEYS = {
+			Geometry.class.getCanonicalName(),
+			Point.class.getCanonicalName(),
+			Polygon.class.getCanonicalName(),
+			MultiPolygon.class.getCanonicalName(),
+			LineString.class.getCanonicalName(),
+			MultiLineString.class.getCanonicalName(),
+			MultiPoint.class.getCanonicalName(),
+			GeometryCollection.class.getCanonicalName(),
+			"geolatte_geometry"
+	};
+
 	/**
 	 * Constructs an instance with the specified {@code SqlTypeDescriptor}
 	 *
@@ -38,17 +50,7 @@ public class GeolatteGeometryType extends AbstractSingleColumnStandardBasicType<
 
 	@Override
 	public String[] getRegistrationKeys() {
-		return new String[] {
+		return REG_KEYS;
-				Geometry.class.getCanonicalName(),
-				Point.class.getCanonicalName(),
-				Polygon.class.getCanonicalName(),
-				MultiPolygon.class.getCanonicalName(),
-				LineString.class.getCanonicalName(),
-				MultiLineString.class.getCanonicalName(),
-				MultiPoint.class.getCanonicalName(),
-				GeometryCollection.class.getCanonicalName(),
-				"geolatte_geometry"
-		};
 	}
 
 	@Override

hibernate-spatial/src/test/java/org/hibernate/spatial/testing/converter/GeometryConverter.java

@@ -0,0 +1,36 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.spatial.testing.converter;
+
+import javax.persistence.AttributeConverter;
+import javax.persistence.Converter;
+
+import org.hibernate.spatial.dialect.h2geodb.GeoDbWkb;
+
+import org.geolatte.geom.Geometry;
+
+/**
+ * @author Steve Ebersole
+ */
+@Converter( autoApply = true )
+public class GeometryConverter implements AttributeConverter<Geometry,byte[]> {
+	@Override
+	public byte[] convertToDatabaseColumn(Geometry attribute) {
+		if ( attribute == null ) {
+			return null;
+		}
+		return GeoDbWkb.to( attribute );
+	}
+
+	@Override
+	public Geometry convertToEntityAttribute(byte[] dbData) {
+		if ( dbData == null ) {
+			return null;
+		}
+		return GeoDbWkb.from( dbData );
+	}
+}

hibernate-spatial/src/test/java/org/hibernate/spatial/testing/converter/GeometryConverterTest.java

@@ -0,0 +1,76 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.spatial.testing.converter;
+
+import org.hibernate.boot.MetadataSources;
+import org.hibernate.boot.registry.StandardServiceRegistry;
+import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
+import org.hibernate.boot.spi.MetadataBuilderImplementor;
+import org.hibernate.cfg.AvailableSettings;
+import org.hibernate.engine.spi.SessionFactoryImplementor;
+import org.hibernate.metamodel.model.convert.spi.JpaAttributeConverter;
+import org.hibernate.persister.entity.EntityPersister;
+import org.hibernate.spatial.GeolatteGeometryJavaTypeDescriptor;
+import org.hibernate.spatial.dialect.h2geodb.GeoDBDialect;
+import org.hibernate.tool.schema.Action;
+import org.hibernate.type.descriptor.converter.AttributeConverterTypeAdapter;
+import org.hibernate.type.spi.TypeConfiguration;
+
+import org.hibernate.testing.junit4.BaseUnitTestCase;
+import org.junit.Test;
+
+import org.geolatte.geom.Geometry;
+
+import static org.hamcrest.CoreMatchers.sameInstance;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hibernate.testing.junit4.ExtraAssertions.assertTyping;
+
+/**
+ * @author Steve Ebersole
+ */
+public class GeometryConverterTest extends BaseUnitTestCase {
+
+	@Test
+	public void testConverterUsage() {
+		try ( final StandardServiceRegistry ssr = new StandardServiceRegistryBuilder()
+				.applySetting( AvailableSettings.DIALECT, GeoDBDialect.class )
+				.applySetting( AvailableSettings.HBM2DDL_AUTO, Action.CREATE_DROP )
+				.build() ) {
+			final MetadataSources metadataSources = new MetadataSources( ssr )
+					.addAnnotatedClass( GeometryConverter.class )
+					.addAnnotatedClass( MyEntity.class );
+			final MetadataBuilderImplementor metadataBuilder = (MetadataBuilderImplementor) metadataSources.getMetadataBuilder();
+
+			try ( final SessionFactoryImplementor sessionFactory =
+						  (SessionFactoryImplementor) metadataBuilder.build().buildSessionFactory() ) {
+
+				final TypeConfiguration typeConfiguration = sessionFactory.getMetamodel().getTypeConfiguration();
+
+				assertThat(
+						typeConfiguration.getJavaTypeDescriptorRegistry().getDescriptor( Geometry.class ),
+						sameInstance( GeolatteGeometryJavaTypeDescriptor.INSTANCE )
+				);
+
+				// todo (5.3) : what to assert wrt to SqlTypeDescriptor?  Anything?
+
+				final EntityPersister entityPersister = sessionFactory.getMetamodel().entityPersister( MyEntity.class );
+				final AttributeConverterTypeAdapter geometryAttributeType = assertTyping(
+						AttributeConverterTypeAdapter.class,
+						entityPersister.getPropertyType( "geometry" )
+				);
+
+				final JpaAttributeConverter converter = assertTyping(
+						JpaAttributeConverter.class,
+						geometryAttributeType.getAttributeConverter()
+				);
+
+				assert GeometryConverter.class.equals( converter.getConverterBean().getBeanClass() );
+			}
+		}
+	}
+
+}

hibernate-spatial/src/test/java/org/hibernate/spatial/testing/converter/MyEntity.java

@@ -0,0 +1,52 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.spatial.testing.converter;
+
+import javax.persistence.Basic;
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.Table;
+
+import org.geolatte.geom.Geometry;
+
+/**
+ * @author Steve Ebersole
+ */
+@Entity
+@Table( name = "SP_CUST_TYPE_CONV_ENTITY")
+public class MyEntity {
+	private Integer id;
+	private Geometry geometry;
+
+	public MyEntity() {
+	}
+
+	public MyEntity(Integer id, Geometry geometry) {
+		this.id = id;
+		this.geometry = geometry;
+	}
+
+	@Id
+	public Integer getId() {
+		return id;
+	}
+
+	public void setId(Integer id) {
+		this.id = id;
+	}
+
+	// NOTE : the AttributeConverter should be auto-applied here
+
+	@Basic
+	public Geometry getGeometry() {
+		return geometry;
+	}
+
+	public void setGeometry(Geometry geometry) {
+		this.geometry = geometry;
+	}
+}

hibernate-spatial/src/test/java/org/hibernate/spatial/testing/converter/package-info.java

@@ -0,0 +1,12 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+
+/**
+ * Make sure that JPA {@link javax.persistence.AttributeConverter}
+ * implementations using Geolatte types work with hibernate-spatial
+ */
+package org.hibernate.spatial.testing.converter;