Java Community | Help. Code. Learn.•3w ago

The collection of metamodel types is empty

I'm have a maven project with JPA and EclipseLink. When I run it don't generate the tables in the database. I have this output:

The collection of metamodel types is empty. Model classes may not have been found during entity search for Java SE and some Java EE container managed persistence units.  Please verify that your entity classes are referenced in persistence.xml using either <class> elements or a global <exclude-unlisted-classes>false</exclude-unlisted-classes> element

The collection of metamodel types is empty. Model classes may not have been found during entity search for Java SE and some Java EE container managed persistence units.  Please verify that your entity classes are referenced in persistence.xml using either <class> elements or a global <exclude-unlisted-classes>false</exclude-unlisted-classes> element

IceCreamShop/src/main/resources/META-INF/persistence.xml:

<?xml version="1.0" encoding="UTF-8"?>
<
persistence version="3.2" xmlns="https://jakarta.ee/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="https://jakarta.ee/xml/ns/persistence https://jakarta.ee/xml/ns/persistence/persistence_3_2.xsd">
  <persistence-unit name="IceCreamShopPU" transaction-type="RESOURCE_LOCAL">
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
    <class>org.logic.Action</class>
    <class>org.logic.Flavor</class>
    <class>org.logic.Ice_Cream</class>
    <class>org.logic.Invoice</class>
    <class>org.logic.Orden</class>
    <class>org.logic.Role</class>
    <class>org.logic.Size</class>
    <class>org.logic.User</class>
    <properties>
      <property name="jakarta.persistence.jdbc.url" value="jdbc:mariadb://localhost:3306/IceCream?serverTimezone=UTC"/>
      <property name="jakarta.persistence.jdbc.user" value="admin"/>
      <property name="jakarta.persistence.jdbc.driver" value="org.mariadb.jdbc.Driver"/>
      <property name="jakarta.persistence.jdbc.password" value="+V$u]"/>
      <property name="jakarta.persistence.schema-generation.database.action" value="create"/>
    </properties>
  </persistence-unit>
</persistence>

<?xml version="1.0" encoding="UTF-8"?>
<
persistence version="3.2" xmlns="https://jakarta.ee/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="https://jakarta.ee/xml/ns/persistence https://jakarta.ee/xml/ns/persistence/persistence_3_2.xsd">
  <persistence-unit name="IceCreamShopPU" transaction-type="RESOURCE_LOCAL">
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
    <class>org.logic.Action</class>
    <class>org.logic.Flavor</class>
    <class>org.logic.Ice_Cream</class>
    <class>org.logic.Invoice</class>
    <class>org.logic.Orden</class>
    <class>org.logic.Role</class>
    <class>org.logic.Size</class>
    <class>org.logic.User</class>
    <properties>
      <property name="jakarta.persistence.jdbc.url" value="jdbc:mariadb://localhost:3306/IceCream?serverTimezone=UTC"/>
      <property name="jakarta.persistence.jdbc.user" value="admin"/>
      <property name="jakarta.persistence.jdbc.driver" value="org.mariadb.jdbc.Driver"/>
      <property name="jakarta.persistence.jdbc.password" value="+V$u]"/>
      <property name="jakarta.persistence.schema-generation.database.action" value="create"/>
    </properties>
  </persistence-unit>
</persistence>

16 Replies

JavaBot•3w ago

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Franscis123$#OP•3w ago

All of my classes have a similar mapping:

package org.logic;

import java.io.Serializable;
import javax.persistence.*;
import java.util.List;

@Entity
public class Action implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE)
    private int act_id;


    @Column(unique=true)
    private String action;

    @ManyToMany
    private List<Role> roles;

//Contructors, getters and setters, etc.

package org.logic;

import java.io.Serializable;
import javax.persistence.*;
import java.util.List;

@Entity
public class Action implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE)
    private int act_id;


    @Column(unique=true)
    private String action;

    @ManyToMany
    private List<Role> roles;

//Contructors, getters and setters, etc.

pom.xml:

<?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>
    <groupId>org</groupId>
    <artifactId>IceCreamShop</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>
    <dependencies>
        <dependency>
            <groupId>org.mariadb.jdbc</groupId>
            <artifactId>mariadb-java-client</artifactId>
            <version>3.4.1</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>org.eclipse.persistence.core</artifactId>
            <version>4.0.5</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>org.eclipse.persistence.asm</artifactId>
<version>9.4.0</version>
        </dependency>

<?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>
    <groupId>org</groupId>
    <artifactId>IceCreamShop</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>
    <dependencies>
        <dependency>
            <groupId>org.mariadb.jdbc</groupId>
            <artifactId>mariadb-java-client</artifactId>
            <version>3.4.1</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>org.eclipse.persistence.core</artifactId>
            <version>4.0.5</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>org.eclipse.persistence.asm</artifactId>
<version>9.4.0</version>
        </dependency>

      <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>org.eclipse.persistence.antlr</artifactId>
            <version>2.7.12</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>org.eclipse.persistence.jpa</artifactId>
            <version>4.0.5</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>org.eclipse.persistence.jpa.jpql</artifactId>
            <version>4.0.5</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>org.eclipse.persistence.moxy</artifactId>
            <version>4.0.4</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>jakarta.persistence</artifactId>
            <version>2.2.3</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>org.eclipse.persistence.jpa.modelgen.processor</artifactId>
            <version>4.0.4-RC1</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>jakarta.persistence</groupId>
            <artifactId>jakarta.persistence-api</artifactId>
            <version>3.2.0</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-simple</artifactId>
            <version>2.0.13</version>
        </dependency>
    </dependencies>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
        <exec.mainClass>org.icecreamshop.IceCreamShop</exec.mainClass>
    </properties>
</project>

      <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>org.eclipse.persistence.antlr</artifactId>
            <version>2.7.12</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>org.eclipse.persistence.jpa</artifactId>
            <version>4.0.5</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>org.eclipse.persistence.jpa.jpql</artifactId>
            <version>4.0.5</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>org.eclipse.persistence.moxy</artifactId>
            <version>4.0.4</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>jakarta.persistence</artifactId>
            <version>2.2.3</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>org.eclipse.persistence.jpa.modelgen.processor</artifactId>
            <version>4.0.4-RC1</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>jakarta.persistence</groupId>
            <artifactId>jakarta.persistence-api</artifactId>
            <version>3.2.0</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-simple</artifactId>
            <version>2.0.13</version>
        </dependency>
    </dependencies>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
        <exec.mainClass>org.icecreamshop.IceCreamShop</exec.mainClass>
    </properties>
</project>

Adding

<exclude-unlisted-classes>false</exclude-unlisted-classes>

<exclude-unlisted-classes>false</exclude-unlisted-classes>

to persistence.xml don't solve it, neither with true

dan1st•3w ago

Can you show your main class? or whatever creates the EntityManagerFactory What IDE are you using?

dan1st•3w ago

according to https://www.eclipse.org/forums/index.php/t/365263/, the warning shouldn't matter if you don't use the criteria API

Eclipse Community Forums: EclipseLink » The collection of metamodel...

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dan1st•3w ago

What happens if you just try to insert an element into the DB from your application? I think it might only create the tables when you execute something or you could try these properties:

<property name="eclipselink.ddl-generation" value="create-tables" />
<property name="eclipselink.ddl-generation.output-mode" value="database" />

<property name="eclipselink.ddl-generation" value="create-tables" />
<property name="eclipselink.ddl-generation.output-mode" value="database" />

Franscis123$#OP•3w ago

package org.logic;

import org.persistence.PersistenceController;

public class Main {

    public static void main(String[] args) {

        PersistenceController PerCtrl = new PersistenceController();

    }

}

package org.logic;

import org.persistence.PersistenceController;

public class Main {

    public static void main(String[] args) {

        PersistenceController PerCtrl = new PersistenceController();

    }

}

package org.persistence;

public class PersistenceController {

    ActionJpaController ActJpaCtrl = new ActionJpaController();
    FlavorJpaController FlvJpaCtrl = new FlavorJpaController();
    Ice_CreamJpaController IceJpaCtrl = new Ice_CreamJpaController();
    InvoiceJpaController InvJpaCtrl = new InvoiceJpaController();
    OrdenJpaController OrdJpaCtrl = new OrdenJpaController();
    RoleJpaController RolJpaCtrl = new RoleJpaController();
    SizeJpaController SizJpaCtrl = new SizeJpaController();
    UserJpaController UsrJpaCtrl = new UserJpaController();


}

package org.persistence;

public class PersistenceController {

    ActionJpaController ActJpaCtrl = new ActionJpaController();
    FlavorJpaController FlvJpaCtrl = new FlavorJpaController();
    Ice_CreamJpaController IceJpaCtrl = new Ice_CreamJpaController();
    InvoiceJpaController InvJpaCtrl = new InvoiceJpaController();
    OrdenJpaController OrdJpaCtrl = new OrdenJpaController();
    RoleJpaController RolJpaCtrl = new RoleJpaController();
    SizeJpaController SizJpaCtrl = new SizeJpaController();
    UserJpaController UsrJpaCtrl = new UserJpaController();


}

package org.persistence;

import jakarta.persistence.*;
import java.io.Serializable;
import jakarta.persistence.criteria.CriteriaQuery;
import jakarta.persistence.criteria.Root;
import org.logic.Role;
import java.util.ArrayList;
import java.util.List;
import org.logic.Action;
import org.persistence.exceptions.NonexistentEntityException;

public class ActionJpaController implements Serializable {

    public ActionJpaController(EntityManagerFactory emf) {
        this.emf = emf;
    }

    public ActionJpaController() { emf = Persistence.createEntityManagerFactory("IceCreamShopPU"); }

    private EntityManagerFactory emf = null;

    public EntityManager getEntityManager() {
        return emf.createEntityManager();
    }

package org.persistence;

import jakarta.persistence.*;
import java.io.Serializable;
import jakarta.persistence.criteria.CriteriaQuery;
import jakarta.persistence.criteria.Root;
import org.logic.Role;
import java.util.ArrayList;
import java.util.List;
import org.logic.Action;
import org.persistence.exceptions.NonexistentEntityException;

public class ActionJpaController implements Serializable {

    public ActionJpaController(EntityManagerFactory emf) {
        this.emf = emf;
    }

    public ActionJpaController() { emf = Persistence.createEntityManagerFactory("IceCreamShopPU"); }

    private EntityManagerFactory emf = null;

    public EntityManager getEntityManager() {
        return emf.createEntityManager();
    }

dan1st•3w ago

you create a new EntityManagerFactory for each entity class/controller? normally you should have one EntityManagerFactory for your application e.g. you could create it in PersistenceController

Franscis123$#OP•3w ago

I created a JpaController class for each class

dan1st•3w ago

yeah but you don't need to create EntityManagerFactorys in each of these controllers

Franscis123$#OP•3w ago

IntelliJ IDEA Community

dan1st•3w ago

. . .

Franscis123$#OP•3w ago

I don't tried it because I don't have tables in my database Also I used NetBeans only to generate the JpaControllers, because IntelliJ Community don't have these options with premium, and it generate one for each class.

dan1st•3w ago

try it and see what happens I guess

Franscis123$#OP•3w ago

How could create the EntityManagerFactory in the Persistence Controller?

dan1st•3w ago

package org.persistence;

public class PersistenceController {
  
    private final EntityManagerFactory emf = Persistence.createEntityManagerFactory("IceCreamShopPU");

    final ActionJpaController actJpaCtrl = new ActionJpaController(emf);
    final FlavorJpaController flvJpaCtrl = new FlavorJpaController(emf);
    final Ice_CreamJpaController iceJpaCtrl = new Ice_CreamJpaController(emf);
    final InvoiceJpaController invJpaCtrl = new InvoiceJpaController(emf);
    final OrdenJpaController ordJpaCtrl = new OrdenJpaController(emf);
    final RoleJpaController rolJpaCtrl = new RoleJpaController(emf);
    final SizeJpaController sizJpaCtrl = new SizeJpaController(emf);
    final UserJpaController usrJpaCtrl = new UserJpaController(emf);


}

package org.persistence;

public class PersistenceController {
  
    private final EntityManagerFactory emf = Persistence.createEntityManagerFactory("IceCreamShopPU");

    final ActionJpaController actJpaCtrl = new ActionJpaController(emf);
    final FlavorJpaController flvJpaCtrl = new FlavorJpaController(emf);
    final Ice_CreamJpaController iceJpaCtrl = new Ice_CreamJpaController(emf);
    final InvoiceJpaController invJpaCtrl = new InvoiceJpaController(emf);
    final OrdenJpaController ordJpaCtrl = new OrdenJpaController(emf);
    final RoleJpaController rolJpaCtrl = new RoleJpaController(emf);
    final SizeJpaController sizJpaCtrl = new SizeJpaController(emf);
    final UserJpaController usrJpaCtrl = new UserJpaController(emf);


}

ping since it's been some time since you wrote that

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The collection of metamodel types is empty

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