test asserting Hibernate handling of unclear jpa behavior wrt merging detached object with reference to transient object via non-cascaded association

hibernate-entitymanager/src/test/java/org/hibernate/jpa/test/cascade/MergeWithTransientNonCascadedAssociationTest.java

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+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2012, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.jpa.test.cascade;
+
+import javax.persistence.Entity;
+import javax.persistence.EntityManager;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.ManyToOne;
+
+import org.hibernate.LockMode;
+import org.hibernate.Session;
+import org.hibernate.annotations.GenericGenerator;
+import org.hibernate.jpa.test.BaseEntityManagerFunctionalTestCase;
+
+import org.junit.Test;
+
+import static org.junit.Assert.fail;
+
+/**
+ * @author Steve Ebersole
+ */
+public class MergeWithTransientNonCascadedAssociationTest extends BaseEntityManagerFunctionalTestCase {
+	@Override
+	public Class[] getAnnotatedClasses() {
+		return new Class[] { Person.class, Address.class };
+	}
+
+	@Test
+	public void testMergeWithTransientNonCascadedAssociation() {
+		EntityManager em = getOrCreateEntityManager();
+		em.getTransaction().begin();
+		Person person = new Person();
+		em.persist( person );
+		em.getTransaction().commit();
+		em.close();
+
+		person.address = new Address();
+
+		em = getOrCreateEntityManager();
+		em.getTransaction().begin();
+		em.merge( person );
+		try {
+			em.flush();
+			fail( "Expecting IllegalStateException" );
+		}
+		catch (IllegalStateException ise) {
+			// expected...
+			em.getTransaction().rollback();
+		}
+		em.close();
+
+		em = getOrCreateEntityManager();
+		em.getTransaction().begin();
+		person.address = null;
+		em.unwrap( Session.class ).lock( person, LockMode.NONE );
+		em.unwrap( Session.class ).delete( person );
+		em.getTransaction().commit();
+		em.close();
+	}
+
+	@Entity( name = "Person" )
+	public static class Person {
+		@Id
+		@GeneratedValue( generator = "increment" )
+		@GenericGenerator( name = "increment", strategy = "increment" )
+		private Integer id;
+		@ManyToOne
+		private Address address;
+
+		public Person() {
+		}
+	}
+
+	@Entity( name = "Address" )
+	public static class Address {
+		@Id
+		@GeneratedValue( generator = "increment" )
+		@GenericGenerator( name = "increment", strategy = "increment" )
+		private Integer id;
+	}
+}