temporary persistence work

spring-hibernate4/src/main/java/org/baeldung/spring/persistence/model/Child.java

@@ -3,8 +3,11 @@ package org.baeldung.spring.persistence.model;
 import java.io.Serializable;
 
 import javax.persistence.Entity;
+import javax.persistence.FetchType;
 import javax.persistence.GeneratedValue;
 import javax.persistence.Id;
+import javax.persistence.OneToOne;
+import javax.persistence.PrimaryKeyJoinColumn;
 
 @Entity
 public class Child implements Serializable {
@@ -13,6 +16,10 @@ public class Child implements Serializable {
     @GeneratedValue
     private long id;
 
+    @OneToOne(fetch = FetchType.LAZY)
+    @PrimaryKeyJoinColumn
+    private Parent parent;
+
     public Child() {
         super();
     }
@@ -27,4 +34,12 @@ public class Child implements Serializable {
         this.id = id;
     }
 
+    public Parent getParent() {
+        return parent;
+    }
+
+    public void setParent(final Parent parent) {
+        this.parent = parent;
+    }
+
 }

spring-hibernate4/src/main/java/org/baeldung/spring/persistence/model/Parent.java

@@ -2,9 +2,12 @@ package org.baeldung.spring.persistence.model;
 
 import java.io.Serializable;
 
+import javax.persistence.CascadeType;
 import javax.persistence.Entity;
+import javax.persistence.FetchType;
 import javax.persistence.GeneratedValue;
 import javax.persistence.Id;
+import javax.persistence.OneToOne;
 
 @Entity
 public class Parent implements Serializable {
@@ -13,10 +16,19 @@ public class Parent implements Serializable {
     @GeneratedValue
     private long id;
 
+    @OneToOne(fetch = FetchType.LAZY, mappedBy = "parent", cascade = CascadeType.ALL)
+    private Child child;
+
     public Parent() {
         super();
     }
 
+    public Parent(final Child child) {
+        super();
+
+        this.child = child;
+    }
+
     // API
 
     public long getId() {
@@ -27,4 +39,12 @@ public class Parent implements Serializable {
         this.id = id;
     }
 
+    public Child getChild() {
+        return child;
+    }
+
+    public void setChild(final Child child) {
+        this.child = child;
+    }
+
 }

spring-hibernate4/src/test/java/org/baeldung/spring/persistence/service/ParentServicePersistenceIntegrationTest.java

@@ -1,6 +1,8 @@
 package org.baeldung.spring.persistence.service;
 
 import org.baeldung.spring.persistence.config.PersistenceConfig;
+import org.baeldung.spring.persistence.model.Child;
+import org.baeldung.spring.persistence.model.Parent;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -25,4 +27,14 @@ public class ParentServicePersistenceIntegrationTest {
         //
     }
 
+    @Test
+    public final void whenEntityIsCreated_thenNoExceptions() {
+        final Child childEntity = new Child();
+        childService.create(childEntity);
+
+        service.create(new Parent(childEntity));
+
+        System.out.println();
+    }
+
 }