Added multi-store example to Spring Data REST examples.

This app demonstrates how to mix Spring Data JPA and Spring Data MongoDB together (with Spring Data REST on top) to demonstrate how to split them up properly.

rest/multi-store/README.adoc

@@ -0,0 +1,199 @@
+= Mixing Spring Data JPA and Spring Data MongoDB (with Spring Data REST for extra)
+
+This example app shows how to mix together several Spring Data projects.
+
+* Each data store's domain objects must be split up into distinct packages. That way, the Spring Data store can be configured.
+* It's most important to make sure the underlying Spring Data layers work before adding Spring Data REST. Spring Data REST simply delegates and doesn't write extra functionality.
+* With both set up properly, things should flow nicely.
+
+== Top level app
+
+[source,java]
+----
+package example;
+
+// …import statements …
+
+@Configuration
+@EnableAutoConfiguration
+@EnableJpaRepositories
+@EnableMongoRepositories
+public class Application {
+
+  private static final Logger log = LoggerFactory.getLogger(Application.class);
+
+  public static void main(String[] args) {
+    SpringApplication.run(Application.class, args);
+  }
+
+  @Autowired PersonRepository personRepository;
+  @Autowired TreasureRepository treasureRepository;
+
+  @PostConstruct
+  void checkitOut() {
+
+    personRepository.save(new Person("Frodo", "Baggins"));
+    personRepository.save(new Person("Bilbo", "Baggins"));
+
+    for (Person person : personRepository.findAll()) {
+      log.info("Hello " + person.toString());
+    }
+
+    treasureRepository.deleteAll();
+
+    Treasure sting = new Treasure();
+    sting.setName("Sting");
+    sting.setDescription("Made by the Elves");
+    treasureRepository.save(sting);
+
+    Treasure ring = new Treasure();
+    ring.setName("Sauron's ring");
+    ring.setDescription("One ring to rule them all");
+    treasureRepository.save(ring);
+
+    for (Treasure treasure : treasureRepository.findAll()) {
+      log.info("Found treasure " + treasure.toString());
+    }
+  }
+}
+----
+
+* Notice how `@EnableJpaRepositories(basePackageClasses = Person.class)` uses `Person` as a tip off of what package to start scanning for JPA entities
+* Notice how `@EnableMongoRepositories(basePackageClasses = Treasure.class)` uses `Treasure` to tip off where to look for MongoDB documents
+* The repository interfaces need to be in the separate packages as well. Otherwise, it doesn't work for the same reason.
+
+To prove it works, two people are created, stored, then retrieved. Then, two treasures are created, stored, and retrieved.
+
+NOTE: The treasures are first cleared out. Otherwise, every time you run this app, it will keep adding.
+
+After launching the app by running `mvn spring-boot:run`, from another shell, you can explore the RESTful interface.
+
+[source, bash]
+----
+$ curl http://localhost:8080
+----
+[source, javascript]
+----
+{ "_links" : {
+    "persons" : {
+      "href" : "http://localhost:8080/persons"
+    },
+    "treasures" : {
+      "href" : "http://localhost:8080/treasures"
+    }
+  }
+}
+----
+
+Here you can see the two resources backed by the repositories of the application, served up seamlessly. Following the `persons` link, you can see the two people created at startup.
+
+[source, bash]
+----
+$ curl http://localhost:8080/persons
+----
+[source, javascript]
+----
+{ "_embedded" : {
+    "persons" : [ {
+      "firstName" : "Frodo",
+      "lastName" : "Baggins",
+      "_links" : {
+        "self" : {
+          "href" : "http://localhost:8080/persons/1"
+        }
+      }
+    }, {
+      "firstName" : "Bilbo",
+      "lastName" : "Baggins",
+      "_links" : {
+        "self" : {
+          "href" : "http://localhost:8080/persons/2"
+        }
+      }
+    } ]
+  }
+}
+----
+
+You can easily create a new entry:
+
+[source, bash]
+----
+$ curl -X POST -i -H "Content-Type:application/json" -d '{"firstName":"Greg", "lastName":"Turnquist"}' http://localhost:8080/persons
+HTTP/1.1 201 Created
+Server: Apache-Coyote/1.1
+Location: http://localhost:8080/persons/3
+Content-Length: 0
+Date: Tue, 22 Jul 2014 22:26:17 GMT
+
+$ curl http://localhost:8080/persons/3
+----
+[source, javascript]
+----
+{ "firstName" : "Greg",
+  "lastName" : "Turnquist",
+  "_links" : {
+    "self" : {
+      "href" : "http://localhost:8080/persons/3"
+    }
+  }
+}
+----
+
+Excellent!
+
+[source, bash]
+----
+$ curl http://localhost:8080/treasures
+----
+[source, javascript]
+----
+{ "_embedded" : {
+    "treasures" : [ {
+      "name" : "Sting",
+      "description" : "Made by the Elves",
+      "_links" : {
+        "self" : {
+          "href" : "http://localhost:8080/treasures/53cedae13004309b49465fbc"
+        }
+      }
+    }, {
+      "name" : "Sauron's ring",
+      "description" : "One ring to rule them all",
+      "_links" : {
+        "self" : {
+          "href" : "http://localhost:8080/treasures/53cedae13004309b49465fbd"
+        }
+      }
+    } ]
+  }
+}
+----
+
+If you venture into `treasures`, you can see the two treasures found in Middle Earth. Let's add another:
+
+[source, bash]
+----
+$ curl -X POST -i -H "content-type:application/json" -d '{"name":"MacBook Pro", "description":"Tool of black magic"}' localhost:8080/treasures
+
+HTTP/1.1 201 Created
+Server: Apache-Coyote/1.1
+Location: http://localhost:8080/treasures/53cee60a3004309b49465fbe
+Content-Length: 0
+Date: Tue, 22 Jul 2014 22:30:34 GMT
+----
+[source, bash]
+----
+$ curl http://localhost:8080/treasures/53cee60a3004309b49465fbe
+----
+[source, javascript]
+----
+{ "name" : "MacBook Pro",
+  "description" : "Tool of black magic",
+  "_links" : {
+    "self" : {
+      "href" : "http://localhost:8080/treasures/53cee60a3004309b49465fbe"
+    }
+  }
+}
+----

rest/multi-store/pom.xml

@@ -0,0 +1,41 @@
+<?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>
+
+	<artifactId>spring-data-rest-multi-store</artifactId>
+
+	<name>Spring Data REST - Multi-store example</name>
+	<description>Spring Data REST example mixing Spring Data JPA and Spring Data MongoDB</description>
+
+	<parent>
+		<groupId>org.springframework.data.examples</groupId>
+		<artifactId>spring-data-rest-examples</artifactId>
+		<version>1.0.0.BUILD-SNAPSHOT</version>
+	</parent>
+	
+	<properties>
+		<spring-data-releasetrain.version>Evans-BUILD-SNAPSHOT</spring-data-releasetrain.version>
+		<spring-hateoas.version>0.16.0.RELEASE</spring-hateoas.version>
+	</properties>
+
+	<dependencies>
+
+		<!-- JPA -->
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-data-jpa</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>com.h2database</groupId>
+			<artifactId>h2</artifactId>
+		</dependency>
+
+		<!-- MongoDB -->
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-data-mongodb</artifactId>
+		</dependency>
+	</dependencies>
+
+</project>

rest/multi-store/src/main/java/example/Application.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright 2014 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 javax.annotation.PostConstruct;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+import org.springframework.data.mongodb.repository.config.EnableMongoRepositories;
+
+import example.person.Person;
+import example.person.PersonRepository;
+import example.treasure.Treasure;
+import example.treasure.TreasureRepository;
+
+/**
+ * Application configuration file. Used for bootstrap and data setup.
+ *
+ * @author Greg Turnquist
+ * @author Oliver Gierke
+ */
+@Configuration
+@EnableAutoConfiguration
+@EnableJpaRepositories
+@EnableMongoRepositories
+public class Application {
+
+	private static final Logger log = LoggerFactory.getLogger(Application.class);
+
+	public static void main(String[] args) {
+		SpringApplication.run(Application.class, args);
+	}
+
+	@Autowired PersonRepository personRepository;
+	@Autowired TreasureRepository treasureRepository;
+
+	@PostConstruct
+	void checkitOut() {
+
+		personRepository.save(new Person("Frodo", "Baggins"));
+		personRepository.save(new Person("Bilbo", "Baggins"));
+
+		for (Person person : personRepository.findAll()) {
+			log.info("Hello " + person.toString());
+		}
+
+		treasureRepository.deleteAll();
+		treasureRepository.save(new Treasure("Sting", "Made by the Elves"));
+		treasureRepository.save(new Treasure("Sauron's ring", "One ring to rule them all"));
+
+		for (Treasure treasure : treasureRepository.findAll()) {
+			log.info("Found treasure " + treasure.toString());
+		}
+	}
+}

rest/multi-store/src/main/java/example/person/Person.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2014 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.person;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+
+import lombok.Data;
+import lombok.RequiredArgsConstructor;
+
+/**
+ * A person.
+ *
+ * @author Greg Turnquist
+ * @author Oliver Gierke
+ */
+@Entity
+@Data
+@RequiredArgsConstructor
+public class Person {
+
+	private @Id @GeneratedValue Long id;
+	private final String firstName;
+	private final String lastName;
+
+	protected Person() {
+		this(null, null);
+	}
+}

rest/multi-store/src/main/java/example/person/PersonRepository.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2014 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.person;
+
+import org.springframework.data.repository.CrudRepository;
+
+/**
+ * A repository to manage {@link Person} instances.
+ * 
+ * @author Greg Turnquist
+ * @author Oliver Gierke
+ */
+public interface PersonRepository extends CrudRepository<Person, Long> {}

rest/multi-store/src/main/java/example/treasure/Treasure.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2014 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.treasure;
+
+import lombok.Data;
+import lombok.RequiredArgsConstructor;
+
+import org.springframework.data.annotation.Id;
+import org.springframework.data.mongodb.core.mapping.Document;
+
+/**
+ * A treasure.
+ * 
+ * @author Greg Turnquist
+ * @author Oliver Gierke
+ */
+@Data
+@Document
+@RequiredArgsConstructor
+public class Treasure {
+
+	private @Id String id;
+	private final String name;
+	private final String description;
+}

rest/multi-store/src/main/java/example/treasure/TreasureRepository.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2014 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.treasure;
+
+import org.springframework.data.repository.CrudRepository;
+
+/**
+ * A repository to manage {@link Treasure}s.
+ *
+ * @author Greg Turnquist
+ * @author Oliver Gierke
+ */
+public interface TreasureRepository extends CrudRepository<Treasure, String> {}

rest/pom.xml

@@ -16,6 +16,7 @@
 
 	<modules>
 		<module>starbucks</module>
+		<module>multi-store</module>
 	</modules>
 
 	<properties>