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import static org.hibernate.testing.transaction.TransactionUtil2.inSession;
import static org.hibernate.testing.transaction.TransactionUtil2.inTransaction;

class TheTest {
  @Test
  public void testIsolation() {
    // open the "writing Session"
    inSession(
      getTheSessionFactory(),
      writingSession -> {

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public abstract class BaseSqmToSqlAstConverter {
  ...

	@Override
	public ComparisonPredicate visitComparisonPredicate(SqmComparisonPredicate predicate) {
		class TypeResolver implements BiFunction<SqmExpression,Supplier<ExpressableType<?>>,ExpressableType<?>> {
			private final SqmExpression otherSide;

			private TypeResolver(SqmExpression otherSide) {
				this.otherSide = otherSide;

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public abstract class AbstractSelectCriteria<T, C extends SelectCriteriaImplementor<T>>
		extends AbstractNode
		implements SelectCriteriaImplementor<T> {

  @Override
  public C distinct(boolean distinct) {
    ...
    return this;
  }

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Type System Customization

Hibernate’s "type system" can be customized in a number of ways depending on the nature of the type (basic, entity, etc).

Note	Customization of the Hibernate type system is considered an integration activity, as opposed to an application activity. As of 6.0, all of Hibernate’s type system is considered "incubating"

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org.hibernate.graph.EntityGraphsTest > testBasicMerge FAILED
    java.lang.NullPointerException at EntityGraphsTest.java:163

org.hibernate.graph.EntityGraphsTest > testDifferentBasicsEqual1 FAILED
    java.lang.NullPointerException at EntityGraphsTest.java:44

org.hibernate.graph.EntityGraphsTest > testDifferentBasicsEqual2 FAILED
    java.lang.NullPointerException at EntityGraphsTest.java:51

org.hibernate.graph.EntityGraphsTest > testDifferentComplexGraphsEqual FAILED

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package org.hibernate.service;

import java.util.Map;

import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cache.internal.RegionFactoryInitiator;
import org.hibernate.cache.spi.RegionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.spi.ServiceContributor;

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public interface CollectionSemantics<C> {
	/**
	 * Get the classification of collections described by this semantic
	 */
	CollectionClassification getCollectionClassification();

	C instantiateRaw(int anticipatedSize);

	Iterator getElementIterator(C rawCollection);

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{
    "toolVersion": "1.0.0-SNAPSHOT",
    "baseVersion": "5.0.0.Final",
    "checkVersion": "5.3.0.CR2",
    "generated": "2018-05-04T18:54:50.107Z",
    "incubating": {
        "classes": [
            {
                "name": "org.hibernate.annotations.LazyGroup"
            },

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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Internal
Class org.hibernate.action.internal.AbstractEntityInsertAction
Class org.hibernate.action.internal.BulkOperationCleanupAction
Class org.hibernate.action.internal.CollectionAction
...

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Incubating

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@Test
public void testIt() {
  JavaTypeDescriptorRegistry.INSTANCE.addDescriptor( new MyCustomJavaDescriptor(...) );
  new TypeConfiguration().getJavaDescriptorRegistry().getDescriptor( MyCustom.class ) ...
}