Add Hibernate 4 sample

Add a sample showing how Hibernate 4 can be used if necessary.

See gh-2763

spring-boot-samples/pom.xml

@@ -45,6 +45,7 @@
 		<module>spring-boot-sample-devtools</module>
 		<module>spring-boot-sample-flyway</module>
 		<module>spring-boot-sample-hateoas</module>
+		<module>spring-boot-sample-hibernate4</module>
 		<module>spring-boot-sample-hornetq</module>
 		<module>spring-boot-sample-hypermedia</module>
 		<module>spring-boot-sample-hypermedia-gson</module>

spring-boot-samples/spring-boot-sample-hibernate4/pom.xml

@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<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>
+		<!-- Your own application should inherit from spring-boot-starter-parent -->
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-samples</artifactId>
+		<version>1.4.0.BUILD-SNAPSHOT</version>
+	</parent>
+	<artifactId>spring-boot-sample-hibernate4</artifactId>
+	<name>Spring Boot Hibernate 4 Sample</name>
+	<description>Spring Boot Hibernate 4 Sample</description>
+	<url>http://projects.spring.io/spring-boot/</url>
+	<organization>
+		<name>Pivotal Software, Inc.</name>
+		<url>http://www.spring.io</url>
+	</organization>
+	<properties>
+		<main.basedir>${basedir}/../..</main.basedir>
+		<hibernate.version>4.3.11.Final</hibernate.version>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-data-jpa</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>com.h2database</groupId>
+			<artifactId>h2</artifactId>
+			<scope>runtime</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+	</dependencies>
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+				<dependencies>
+					<dependency>
+						<groupId>org.springframework</groupId>
+						<artifactId>springloaded</artifactId>
+						<version>${spring-loaded.version}</version>
+					</dependency>
+				</dependencies>
+			</plugin>
+		</plugins>
+	</build>
+</project>

spring-boot-samples/spring-boot-sample-hibernate4/src/main/java/sample/hibernate4/SampleHibernate4Application.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2012-2016 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 sample.hibernate4;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SampleHibernate4Application {
+
+	public static void main(String[] args) throws Exception {
+		SpringApplication.run(SampleHibernate4Application.class, args);
+	}
+
+}

spring-boot-samples/spring-boot-sample-hibernate4/src/main/java/sample/hibernate4/domain/City.java

@@ -0,0 +1,77 @@
+/*
+ * Copyright 2012-2016 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 sample.hibernate4.domain;
+
+import java.io.Serializable;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
+@Entity
+public class City implements Serializable {
+
+	private static final long serialVersionUID = 1L;
+
+	@Id
+	@GeneratedValue(strategy = GenerationType.IDENTITY)
+	private Long id;
+
+	@Column(nullable = false)
+	private String name;
+
+	@Column(nullable = false)
+	private String state;
+
+	@Column(nullable = false)
+	private String country;
+
+	@Column(nullable = false)
+	private String map;
+
+	protected City() {
+	}
+
+	public City(String name, String country) {
+		super();
+		this.name = name;
+		this.country = country;
+	}
+
+	public String getName() {
+		return this.name;
+	}
+
+	public String getState() {
+		return this.state;
+	}
+
+	public String getCountry() {
+		return this.country;
+	}
+
+	public String getMap() {
+		return this.map;
+	}
+
+	@Override
+	public String toString() {
+		return getName() + "," + getState() + "," + getCountry();
+	}
+}

spring-boot-samples/spring-boot-sample-hibernate4/src/main/java/sample/hibernate4/domain/Hotel.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright 2012-2016 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 sample.hibernate4.domain;
+
+import java.io.Serializable;
+import java.util.Set;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.FetchType;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.ManyToOne;
+import javax.persistence.OneToMany;
+
+import org.hibernate.annotations.NaturalId;
+
+@Entity
+public class Hotel implements Serializable {
+
+	private static final long serialVersionUID = 1L;
+
+	@Id
+	@GeneratedValue(strategy = GenerationType.IDENTITY)
+	private Long id;
+
+	@ManyToOne(optional = false)
+	@NaturalId
+	private City city;
+
+	@Column(nullable = false)
+	@NaturalId
+	private String name;
+
+	@Column(nullable = false)
+	private String address;
+
+	@Column(nullable = false)
+	private String zip;
+
+	@OneToMany(fetch = FetchType.LAZY, mappedBy = "hotel")
+	private Set<Review> reviews;
+
+	protected Hotel() {
+	}
+
+	public Hotel(City city, String name) {
+		this.city = city;
+		this.name = name;
+	}
+
+	public City getCity() {
+		return this.city;
+	}
+
+	public String getName() {
+		return this.name;
+	}
+
+	public String getAddress() {
+		return this.address;
+	}
+
+	public String getZip() {
+		return this.zip;
+	}
+}

spring-boot-samples/spring-boot-sample-hibernate4/src/main/java/sample/hibernate4/domain/HotelSummary.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2012-2016 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 sample.hibernate4.domain;
+
+public interface HotelSummary {
+
+	City getCity();
+
+	String getName();
+
+	Double getAverageRating();
+
+	default Integer getAverageRatingRounded() {
+		return getAverageRating() == null ? null : (int) Math.round(getAverageRating());
+	}
+
+}

spring-boot-samples/spring-boot-sample-hibernate4/src/main/java/sample/hibernate4/domain/Rating.java

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2012-2016 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 sample.hibernate4.domain;
+
+public enum Rating {
+	TERRIBLE, POOR, AVERAGE, GOOD, EXCELLENT,
+}

spring-boot-samples/spring-boot-sample-hibernate4/src/main/java/sample/hibernate4/domain/RatingCount.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2012-2016 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 sample.hibernate4.domain;
+
+public interface RatingCount {
+
+	Rating getRating();
+
+	long getCount();
+
+}