Add code from article (#10552)

spring-boot-modules/spring-boot-data-2/src/main/java/com/baeldung/boot/readonlyrepository/Book.java

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+package com.baeldung.boot.readonlyrepository;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+
+@Entity
+public class Book
+{
+    @Id
+    @GeneratedValue
+    private Long id;
+    private String author;
+    private String title;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(String author) {
+        this.author = author;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+}

spring-boot-modules/spring-boot-data-2/src/main/java/com/baeldung/boot/readonlyrepository/BookReadOnlyRepository.java

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+package com.baeldung.boot.readonlyrepository;
+
+import java.util.List;
+
+public interface BookReadOnlyRepository extends ReadOnlyRepository<Book, Long> {
+
+    List<Book> findByAuthor(String author);
+
+    List<Book> findByTitle(String title);
+}

spring-boot-modules/spring-boot-data-2/src/main/java/com/baeldung/boot/readonlyrepository/ReadOnlyRepository.java

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+package com.baeldung.boot.readonlyrepository;
+
+import org.springframework.data.repository.NoRepositoryBean;
+import org.springframework.data.repository.Repository;
+
+import java.util.List;
+import java.util.Optional;
+
+@NoRepositoryBean
+public interface ReadOnlyRepository<T, ID> extends Repository<T, ID> {
+
+    Optional<T> findById(ID id);
+
+    List<T> findAll();
+}

spring-boot-modules/spring-boot-data-2/src/main/java/com/baeldung/boot/readonlyrepository/ReadOnlyRepositoryApplication.java

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