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persistence-modules/spring-data-jpa-5/README.md

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+### Relevant Articles: 
+- [Derived Query Methods in Spring Data JPA Repositories](TBD)
+
+### Eclipse Config 
+After importing the project into Eclipse, you may see the following error:  
+"No persistence xml file found in project"
+
+This can be ignored: 
+- Project -> Properties -> Java Persistance -> JPA -> Error/Warnings -> Select Ignore on "No persistence xml file found in project"
+Or: 
+- Eclipse -> Preferences - Validation - disable the "Build" execution of the JPA Validator 

persistence-modules/spring-data-jpa-5/pom.xml

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+<?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-jpa-5</artifactId>
+    <name>spring-data-jpa-5</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-boot-2</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../../parent-boot-2</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jdbc</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.postgresql</groupId>
+            <artifactId>postgresql</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+        </dependency>
+    </dependencies>
+
+</project>

persistence-modules/spring-data-jpa-5/src/main/java/com/baeldung/composite/BookApplication.java

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+package com.baeldung.composite;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class BookApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(BookApplication.class);
+    }
+}

persistence-modules/spring-data-jpa-5/src/main/java/com/baeldung/composite/entity/Book.java

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+package com.baeldung.composite.entity;
+
+import javax.persistence.EmbeddedId;
+import javax.persistence.Entity;
+
+@Entity
+public class Book {
+
+    @EmbeddedId
+    private BookId id;
+    private String genre;
+    private Integer price;
+
+    public Book() {
+    }
+
+    public Book(String author, String name, String genre, Integer price) {
+        BookId id = new BookId(author, name);
+        this.id = id;
+        this.genre = genre;
+        this.price = price;
+    }
+
+    public BookId getId() {
+        return id;
+    }
+
+    public void setId(BookId id) {
+        this.id = id;
+    }
+
+    public String getGenre() {
+        return genre;
+    }
+
+    public void setGenre(String genre) {
+        this.genre = genre;
+    }
+
+    public Integer getPrice() {
+        return price;
+    }
+
+    public void setPrice(Integer price) {
+        this.price = price;
+    }
+}

persistence-modules/spring-data-jpa-5/src/main/java/com/baeldung/composite/entity/BookId.java

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+package com.baeldung.composite.entity;
+
+import javax.persistence.Embeddable;
+import java.io.Serializable;
+import java.util.Objects;
+
+@Embeddable
+public class BookId implements Serializable {
+
+    private String author;
+    private String name;
+
+    public BookId() {
+    }
+
+    public BookId(String author, String name) {
+        this.author = author;
+        this.name = name;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(String author) {
+        this.author = author;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o)
+            return true;
+        if (o == null || getClass() != o.getClass())
+            return false;
+        BookId bookId = (BookId) o;
+        return Objects.equals(author, bookId.author) && Objects.equals(name, bookId.name);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(author, name);
+    }
+}

persistence-modules/spring-data-jpa-5/src/main/java/com/baeldung/composite/repository/BookRepository.java

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+package com.baeldung.composite.repository;
+
+import com.baeldung.composite.entity.Book;
+import com.baeldung.composite.entity.BookId;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+
+@Repository
+public interface BookRepository extends JpaRepository<Book, BookId> {
+
+    List<Book> findByIdName(String name);
+
+    List<Book> findByIdAuthor(String author);
+
+    List<Book> findByGenre(String genre);
+}

persistence-modules/spring-data-jpa-5/src/main/resources/application.properties

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+spring.jpa.show-sql=true
+

persistence-modules/spring-data-jpa-5/src/test/java/com/baeldung/composite/repository/BookRepositoryIntegrationTest.java

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+package com.baeldung.composite.repository;
+
+import com.baeldung.composite.BookApplication;
+import com.baeldung.composite.entity.Book;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+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 java.util.Arrays;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = BookApplication.class)
+public class BookRepositoryIntegrationTest {
+
+    public static final String JAVA_101 = "Java101";
+    public static final String JANE = "Jane";
+    public static final String TECH = "Tech";
+    @Autowired
+    BookRepository repository;
+
+    @Before
+    public void setUp() {
+        Book book1 = new Book("John", JAVA_101, TECH, 20);
+        Book book2 = new Book(JANE, JAVA_101, "Arch", 25);
+        Book book3 = new Book(JANE, "Scala101", TECH, 23);
+
+        repository.saveAll(Arrays.asList(book1, book2, book3));
+    }
+
+    @After
+    public void tearDown() {
+        repository.deleteAll();
+    }
+
+    @Test
+    public void testFindByName() {
+        List<Book> books = repository.findByIdName(JAVA_101);
+
+        assertEquals(2, books.size());
+    }
+
+    @Test
+    public void testFindByAuthor() {
+        List<Book> books = repository.findByIdAuthor(JANE);
+
+        assertEquals(2, books.size());
+    }
+
+    @Test
+    public void testFindByGenre() {
+        List<Book> books = repository.findByGenre(TECH);
+
+        assertEquals(2, books.size());
+    }
+}

persistence-modules/spring-data-jpa-5/src/test/resources/application-test.properties

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+spring.jpa.hibernate.ddl-auto=update
+spring.datasource.url=jdbc:h2:mem:jpa3