Home Spring 5 at least one JPA metamodel must be present
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Spring 5 at least one JPA metamodel must be present

Kate Cebotari
1#
Kate Cebotari Published in 2018-02-10 13:46:16Z

I have searched on StackOverflow for similar problems, and if I remove

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

everything works. However I need the data-jpa.

I have created 2 POJOs:

@Entity
public class Author {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    private String firstName;
    private String lastName;

    @ManyToMany
    private Set<Book> books = new HashSet<>();

    public Author(){}
}

And the second one:

@Entity
public class Book {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    private String title;
    private String isbn;
    private String publisher;

    @ManyToMany
    private Set<Author> authors = new HashSet<>();

    public Book(String title, String isbn, String publisher) {
        this.title = title;
        this.isbn = isbn;
        this.publisher = publisher;
    }
}

I have added 2 Entities and as I understand, I should no longer get the error At least one JPA metamodel must be present. Why I get this error?

DemoApplication.class

@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

My pom.xml dependencies:

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</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-thymeleaf</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>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>4.1.4.Final</version>
    </dependency>

    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-entitymanager</artifactId>
        <version>5.2.3.Final</version>
    </dependency>
</dependencies>
sn42
2#
sn42 Reply to 2018-02-10 14:28:51Z

I am to low in reputation so i can't comment the question.

Can you share your full maven pom.xml please? The solution you are referencing is this answer i guess? In this answer they do not recommend to remove spring-boot-starter-data-jpa but to remove an explicit dependency to an "old" spring-data-jpa.

Make sure to share your pom file, i can only guess right now.

Update:

The dependencies hibernate-core and hibernate-entititymanager are already provided by spring-boot-starter-jpa and you override the managed versions with your custom versions which leads to your error.

Try to remove your explicit hibernate-* dependencies.

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