BAEL-6018: HibernateSystemException: ids for this class must be manually assigned before calling save() (#13121)

persistence-modules/hibernate-enterprise/src/main/java/com/baeldung/hibernate/exception/HibernateUtil.java

@@ -34,6 +34,7 @@ public class HibernateUtil {
         ServiceRegistry serviceRegistry) {
         MetadataSources metadataSources = new MetadataSources(serviceRegistry);
         metadataSources.addAnnotatedClass(Product.class);
+        metadataSources.addAnnotatedClass(ProductEntity.class);
         Metadata metadata = metadataSources.getMetadataBuilder()
             .build();
         return metadata.getSessionFactoryBuilder()

persistence-modules/hibernate-enterprise/src/main/java/com/baeldung/hibernate/exception/ProductEntity.java

@@ -0,0 +1,40 @@
+package com.baeldung.hibernate.exception;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.Table;
+
+@Entity
+@Table(name = "PRODUCT")
+public class ProductEntity {
+
+    @Id
+    private Integer id;
+    private String name;
+    private String description;
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+}

persistence-modules/hibernate-enterprise/src/test/java/com/baeldung/hibernate/exception/HibernateExceptionUnitTest.java

@@ -26,6 +26,7 @@ import org.hibernate.exception.ConstraintViolationException;
 import org.hibernate.exception.DataException;
 import org.hibernate.exception.SQLGrammarException;
 import org.hibernate.hql.internal.ast.QuerySyntaxException;
+import org.hibernate.id.IdentifierGenerationException;
 import org.hibernate.query.NativeQuery;
 import org.hibernate.tool.schema.spi.CommandAcceptanceException;
 import org.hibernate.tool.schema.spi.SchemaManagementException;
@@ -222,6 +223,33 @@ public class HibernateExceptionUnitTest {
 
     }
 
+    @Test
+    public void givenEntityWithoutId_whenCallingSave_thenThrowIdentifierGenerationException() {
+
+        thrown.expect(isA(IdentifierGenerationException.class));
+        thrown.expectMessage("ids for this class must be manually assigned before calling save(): com.baeldung.hibernate.exception.Product");
+
+        Session session = null;
+        Transaction transaction = null;
+
+        try {
+            session = sessionFactory.openSession();
+            transaction = session.beginTransaction();
+
+            ProductEntity product = new ProductEntity();
+            product.setName("Product Name");
+
+            session.save(product);
+            transaction.commit();
+        } catch (Exception e) {
+            rollbackTransactionQuietly(transaction);
+            throw (e);
+        } finally {
+            closeSessionQuietly(session);
+        }
+
+    }
+
     @Test
     public void givenQueryWithDataTypeMismatch_WhenQueryExecuted_thenDataException() {
         thrown.expectCause(isA(DataException.class));