BAEL-5431 BootstrapMode for JPA Repositories

spring-boot-modules/spring-boot-data-2/src/main/java/com/baeldung/boot/bootstrapmode/Application.java

@@ -0,0 +1,50 @@
+package com.baeldung.boot.bootstrapmode;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.Callable;
+import java.util.concurrent.Future;
+
+import javax.sql.DataSource;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.core.task.AsyncTaskExecutor;
+import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
+import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
+import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
+
+@SpringBootApplication
+public class Application {
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class, args);
+    }
+
+    @Bean
+    AsyncTaskExecutor delayedTaskExecutor() {
+        return new ThreadPoolTaskExecutor() {
+            @Override
+            public <T> Future<T> submit(Callable<T> task) {
+                return super.submit(() -> {
+                    Thread.sleep(5000);
+                    return task.call();
+                });
+            }
+        };
+    }
+
+    @Bean
+    LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource, AsyncTaskExecutor delayedTaskExecutor) {
+        LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
+        factory.setPackagesToScan("com.baeldung.boot.bootstrapmode");
+        factory.setJpaVendorAdapter(new HibernateJpaVendorAdapter());
+        factory.setDataSource(dataSource);
+        factory.setBootstrapExecutor(delayedTaskExecutor);
+        Map<String, Object> properties = new HashMap<>();
+        properties.put("hibernate.hbm2ddl.auto", "create-drop");
+        factory.setJpaPropertyMap(properties);
+        return factory;
+    }
+}
+

spring-boot-modules/spring-boot-data-2/src/main/java/com/baeldung/boot/bootstrapmode/domain/Todo.java

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+package com.baeldung.boot.bootstrapmode.domain;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
+@Entity
+public class Todo {
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+    private String label;
+
+    public Todo() {
+    }
+
+    public Todo(String label) {
+        this.label = label;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public String getLabel() {
+        return label;
+    }
+
+    public void setLabel(String label) {
+        this.label = label;
+    }
+}

spring-boot-modules/spring-boot-data-2/src/main/java/com/baeldung/boot/bootstrapmode/repository/TodoRepository.java

@@ -0,0 +1,8 @@
+package com.baeldung.boot.bootstrapmode.repository;
+
+import org.springframework.data.repository.CrudRepository;
+
+import com.baeldung.boot.bootstrapmode.domain.Todo;
+
+public interface TodoRepository extends CrudRepository<Todo, Long> {
+}

spring-boot-modules/spring-boot-data-2/src/test/java/com/baeldung/boot/bootstrapmode/BootstrapmodeDefaultIntegrationTest.java

@@ -0,0 +1,24 @@
+package com.baeldung.boot.bootstrapmode;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
+
+import com.baeldung.boot.bootstrapmode.domain.Todo;
+import com.baeldung.boot.bootstrapmode.repository.TodoRepository;
+
+@DataJpaTest
+class BootstrapmodeDefaultIntegrationTest {
+
+    @Autowired
+    private TodoRepository todoRepository;
+
+    @Test
+    void givenBootstrapmodeValueIsDefault_whenCreatingTodo_shouldSuccess() {
+        Todo todo = new Todo("Something to be done");
+
+        assertThat(todoRepository.save(todo)).hasNoNullFieldsOrProperties();
+    }
+}

spring-boot-modules/spring-boot-data-2/src/test/java/com/baeldung/boot/bootstrapmode/BootstrapmodeDeferredIntegrationTest.java

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+package com.baeldung.boot.bootstrapmode;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
+import org.springframework.data.repository.config.BootstrapMode;
+
+import com.baeldung.boot.bootstrapmode.domain.Todo;
+import com.baeldung.boot.bootstrapmode.repository.TodoRepository;
+
+@DataJpaTest(bootstrapMode = BootstrapMode.DEFERRED)
+class BootstrapmodeDeferredIntegrationTest {
+
+    @Autowired
+    private TodoRepository todoRepository;
+
+    @Test
+    void givenBootstrapmodeValueIsDeferred_whenCreatingTodo_shouldSuccess() {
+        Todo todo = new Todo("Something to be done");
+
+        assertThat(todoRepository.save(todo)).hasNoNullFieldsOrProperties();
+    }
+}

spring-boot-modules/spring-boot-data-2/src/test/java/com/baeldung/boot/bootstrapmode/BootstrapmodeLazyIntegrationTest.java

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+package com.baeldung.boot.bootstrapmode;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
+import org.springframework.data.repository.config.BootstrapMode;
+
+import com.baeldung.boot.bootstrapmode.domain.Todo;
+import com.baeldung.boot.bootstrapmode.repository.TodoRepository;
+
+@DataJpaTest(bootstrapMode = BootstrapMode.LAZY)
+class BootstrapmodeLazyIntegrationTest {
+
+    @Autowired
+    private TodoRepository todoRepository;
+
+    @Test
+    void givenBootstrapmodeValueIsLazy_whenCreatingTodo_shouldSuccess() {
+        Todo todo = new Todo("Something to be done");
+
+        assertThat(todoRepository.save(todo)).hasNoNullFieldsOrProperties();
+    }
+}