#392 - Added example for deferred repository initialization.

jpa/deferred/pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+
+	<parent>
+		<groupId>org.springframework.data.examples</groupId>
+		<artifactId>spring-data-jpa-examples</artifactId>
+		<version>2.0.0.BUILD-SNAPSHOT</version>
+	</parent>
+
+	<artifactId>spring-data-jpa-deferred</artifactId>
+	<name>Spring Data JPA - Deferred bootstrap modes</name>
+
+	<properties>
+		<spring-data-releasetrain.version>Lovelace-BUILD-SNAPSHOT</spring-data-releasetrain.version>
+	</properties>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

jpa/deferred/src/main/java/example/Application.java

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+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package example;
+
+import example.model.Customer;
+
+import javax.sql.DataSource;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Profile;
+import org.springframework.core.env.Environment;
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+import org.springframework.data.repository.config.BootstrapMode;
+import org.springframework.orm.jpa.JpaVendorAdapter;
+import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
+import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
+
+@SpringBootApplication
+public class Application {
+
+	public static void main(String[] args) {
+		SpringApplication.run(Application.class);
+	}
+
+	/**
+	 * Configures a {@link LocalContainerEntityManagerFactoryBean} to use background initialization for the {@code lazy}
+	 * and {@code deferred} profiles.
+	 *
+	 * @author Oliver Gierke
+	 */
+	@Configuration
+	@Profile({ "lazy", "deferred" })
+	static class LazyJpaConfiguration {
+
+		@Bean
+		public LocalContainerEntityManagerFactoryBean entityManagerFactory(JpaVendorAdapter jpaVendorAdapter,
+				DataSource dataSource, Environment environment) {
+
+			ThreadPoolTaskExecutor threadPoolTaskExecutor = new ThreadPoolTaskExecutor();
+			threadPoolTaskExecutor.setDaemon(true);
+			threadPoolTaskExecutor.afterPropertiesSet();
+
+			LocalContainerEntityManagerFactoryBean emf = new LocalContainerEntityManagerFactoryBean();
+			emf.setBootstrapExecutor(threadPoolTaskExecutor);
+			emf.setDataSource(dataSource);
+			emf.setJpaVendorAdapter(jpaVendorAdapter);
+			emf.setPackagesToScan(Customer.class.getPackage().getName());
+
+			return emf;
+		}
+	}
+
+	/**
+	 * Bootstraps Spring Data JPA in lazy mode if the {@code lazy} profile is activated.
+	 *
+	 * @author Oliver Gierke
+	 */
+	@Profile("lazy")
+	@Configuration
+	@EnableJpaRepositories(bootstrapMode = BootstrapMode.LAZY)
+	static class LazyRepositoryConfiguration {}
+
+	/**
+	 * Bootstraps Spring Data JPA in deferred mode if the {@code deferred} profile is activated.
+	 *
+	 * @author Oliver Gierke
+	 */
+	@Profile("deferred")
+	@Configuration
+	@EnableJpaRepositories(bootstrapMode = BootstrapMode.DEFERRED)
+	static class DeferredRepositoryConfiguration {}
+}

jpa/deferred/src/main/java/example/model/Customer.java

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+package example.model;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
+@Entity
+public class Customer {
+
+	@Id @GeneratedValue(strategy = GenerationType.AUTO) private long id;
+	private String firstName;
+	private String lastName;
+
+	protected Customer() {}
+
+	public Customer(String firstName, String lastName) {
+		this.firstName = firstName;
+		this.lastName = lastName;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("Customer[id=%d, firstName='%s', lastName='%s']", id, firstName, lastName);
+	}
+
+}

jpa/deferred/src/main/java/example/model/Customer1.java

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+package example.model;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
+@Entity
+public class Customer1 {
+
+	@Id @GeneratedValue(strategy = GenerationType.AUTO) private long id;
+	private String firstName;
+	private String lastName;
+
+	protected Customer1() {}
+
+	public Customer1(String firstName, String lastName) {
+		this.firstName = firstName;
+		this.lastName = lastName;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("Customer1[id=%d, firstName='%s', lastName='%s']", id, firstName, lastName);
+	}
+
+}

jpa/deferred/src/main/java/example/model/Customer10.java

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+package example.model;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
+@Entity
+public class Customer10 {
+
+	@Id @GeneratedValue(strategy = GenerationType.AUTO) private long id;
+	private String firstName;
+	private String lastName;
+
+	protected Customer10() {}
+
+	public Customer10(String firstName, String lastName) {
+		this.firstName = firstName;
+		this.lastName = lastName;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("Customer10[id=%d, firstName='%s', lastName='%s']", id, firstName, lastName);
+	}
+
+}

jpa/deferred/src/main/java/example/model/Customer100.java

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+package example.model;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
+@Entity
+public class Customer100 {
+
+	@Id @GeneratedValue(strategy = GenerationType.AUTO) private long id;
+	private String firstName;
+	private String lastName;
+
+	protected Customer100() {}
+
+	public Customer100(String firstName, String lastName) {
+		this.firstName = firstName;
+		this.lastName = lastName;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("Customer100[id=%d, firstName='%s', lastName='%s']", id, firstName, lastName);
+	}
+
+}

jpa/deferred/src/main/java/example/model/Customer1000.java

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+package example.model;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
+@Entity
+public class Customer1000 {
+
+	@Id @GeneratedValue(strategy = GenerationType.AUTO) private long id;
+	private String firstName;
+	private String lastName;
+
+	protected Customer1000() {}
+
+	public Customer1000(String firstName, String lastName) {
+		this.firstName = firstName;
+		this.lastName = lastName;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("Customer1000[id=%d, firstName='%s', lastName='%s']", id, firstName, lastName);
+	}
+
+}

jpa/deferred/src/main/java/example/model/Customer1001.java

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+package example.model;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
+@Entity
+public class Customer1001 {
+
+	@Id @GeneratedValue(strategy = GenerationType.AUTO) private long id;
+	private String firstName;
+	private String lastName;
+
+	protected Customer1001() {}
+
+	public Customer1001(String firstName, String lastName) {
+		this.firstName = firstName;
+		this.lastName = lastName;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("Customer1001[id=%d, firstName='%s', lastName='%s']", id, firstName, lastName);
+	}
+
+}

jpa/deferred/src/main/java/example/model/Customer1002.java

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+package example.model;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
+@Entity
+public class Customer1002 {
+
+	@Id @GeneratedValue(strategy = GenerationType.AUTO) private long id;
+	private String firstName;
+	private String lastName;
+
+	protected Customer1002() {}
+
+	public Customer1002(String firstName, String lastName) {
+		this.firstName = firstName;
+		this.lastName = lastName;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("Customer1002[id=%d, firstName='%s', lastName='%s']", id, firstName, lastName);
+	}
+
+}

jpa/deferred/src/main/java/example/model/Customer1003.java

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+package example.model;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
+@Entity
+public class Customer1003 {
+
+	@Id @GeneratedValue(strategy = GenerationType.AUTO) private long id;
+	private String firstName;
+	private String lastName;
+
+	protected Customer1003() {}
+
+	public Customer1003(String firstName, String lastName) {
+		this.firstName = firstName;
+		this.lastName = lastName;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("Customer1003[id=%d, firstName='%s', lastName='%s']", id, firstName, lastName);
+	}
+
+}

jpa/deferred/src/main/java/example/model/Customer1004.java

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+package example.model;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
+@Entity
+public class Customer1004 {
+
+	@Id @GeneratedValue(strategy = GenerationType.AUTO) private long id;
+	private String firstName;
+	private String lastName;
+
+	protected Customer1004() {}
+
+	public Customer1004(String firstName, String lastName) {
+		this.firstName = firstName;
+		this.lastName = lastName;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("Customer1004[id=%d, firstName='%s', lastName='%s']", id, firstName, lastName);
+	}
+
+}

jpa/deferred/src/main/java/example/model/Customer1005.java

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+package example.model;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
+@Entity
+public class Customer1005 {
+
+	@Id @GeneratedValue(strategy = GenerationType.AUTO) private long id;
+	private String firstName;
+	private String lastName;
+
+	protected Customer1005() {}
+
+	public Customer1005(String firstName, String lastName) {
+		this.firstName = firstName;
+		this.lastName = lastName;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("Customer1005[id=%d, firstName='%s', lastName='%s']", id, firstName, lastName);
+	}
+
+}