BAEL-3385: Hibernate @NotNull vs @Column(nullable = false) (#8194)

* BAEL-3385: Hibernate @NotNull vs @Column(nullable = false)

* BAEL-3385: Fix test's assertion

persistence-modules/spring-boot-persistence-h2/pom.xml

@@ -22,6 +22,10 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-data-jpa</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-validation</artifactId>
+        </dependency>
         <dependency>
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>

persistence-modules/spring-boot-persistence-h2/src/main/java/com/baeldung/h2db/springboot/daos/ItemRepository.java

@@ -0,0 +1,9 @@
+package com.baeldung.h2db.springboot.daos;
+
+import com.baeldung.h2db.springboot.models.Item;
+import org.springframework.data.repository.CrudRepository;
+
+import java.math.BigDecimal;
+
+public interface ItemRepository extends CrudRepository<Item, BigDecimal> {
+}

persistence-modules/spring-boot-persistence-h2/src/main/java/com/baeldung/h2db/springboot/models/Item.java

@@ -0,0 +1,18 @@
+package com.baeldung.h2db.springboot.models;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.validation.constraints.NotNull;
+import java.math.BigDecimal;
+
+@Entity
+public class Item {
+
+    @Id
+    @GeneratedValue
+    private Long id;
+
+    @NotNull
+    private BigDecimal price;
+}

persistence-modules/spring-boot-persistence-h2/src/main/resources/application.properties

@@ -3,6 +3,10 @@ spring.datasource.driverClassName=org.h2.Driver
 spring.datasource.username=sa
 spring.datasource.password=
 spring.jpa.hibernate.ddl-auto=create-drop
+spring.jpa.show-sql=true
+spring.jpa.properties.hibernate.format_sql=true
+spring.jpa.properties.hibernate.validator.apply_to_ddl=false
+#spring.jpa.properties.hibernate.check_nullability=true
 spring.h2.console.enabled=true
 spring.h2.console.path=/h2-console
 debug=true

persistence-modules/spring-boot-persistence-h2/src/test/java/com/baeldung/ItemIntegrationTest.java

@@ -0,0 +1,29 @@
+package com.baeldung;
+
+import com.baeldung.h2db.springboot.SpringBootH2Application;
+import com.baeldung.h2db.springboot.daos.ItemRepository;
+import com.baeldung.h2db.springboot.models.Item;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import javax.validation.ConstraintViolationException;
+
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = SpringBootH2Application.class)
+public class ItemIntegrationTest {
+
+    @Autowired
+    private ItemRepository itemRepository;
+
+    @Test
+    public void shouldNotAllowToPersistNullItemsPrice() {
+        assertThatThrownBy(() -> itemRepository.save(new Item()))
+                .hasRootCauseInstanceOf(ConstraintViolationException.class)
+                .hasStackTraceContaining("must not be null");
+    }
+}