CODEWITHSUNDEEP
eclipselinkpersistence.xmljpa-2.1
Jayendra Gothi
Jayendra Gothi

Reputation: 712

java persistence collection of metamodel types is empty

While deploying my jpa project to wildfly server i am gettings following warning:

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

My persistence xml looks like this

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence" version="2.1">
    <persistence-unit name="primary" transaction-type="JTA">
        <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
        <jta-data-source>java:jboss/datasources/example</jta-data-source>
        <exclude-unlisted-classes>false</exclude-unlisted-classes>

        <properties>
            <property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/>
            <property name="javax.persistence.schema-generation.create-source" value="metadata"/>
            <property name="javax.persistence.schema-generation.drop-source" value="metadata"/>
            <property name="eclipselink.target-server" value="JBoss"/>
            <property name="eclipselink.weaving" value="static"/>
        
            <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost/example"/>
            <property name="javax.persistence.jdbc.user" value="root"/>
            <property name="javax.persistence.jdbc.password" value="xxx"/>
        </properties>
    </persistence-unit>
</persistence>

My Database tables are not created due to this.

Please help me understand this problem. As i am not able to understand the root cause of this.

Upvotes: 4

Views: 8952

Answers (2)

Daniel Casta&#241;eda
Daniel Casta&#241;eda

Reputation: 1

What you have to do is add the class that you want to create a table.

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
    <persistence-unit name="practicandoPU" transaction-type="RESOURCE_LOCAL">
        <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
        <class>com.mycompany.jpapracticando.logica.Estudiante</class>
        <properties>
            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/practicandojpa?serverTimezone=UTC"/>
            <property name="javax.persistence.jdbc.user" value="root"/>
            <property name="javax.persistence.jdbc.driver" value="com.mysql.cj.jdbc.Driver"/>
            <property name="javax.persistence.jdbc.password" value=""/>
            <property name="javax.persistence.schema-generation.database.action" value="create"/>
        </properties>
    </persistence-unit>
</persistence>

You have to click on add Class and add the class that has the annotations and you want to create a table. enter image description here

Upvotes: 0

AbVog
AbVog

Reputation: 1577

For people who would come across this question like I did: I've just met this issue in Eclipse 2020-06 when running JPA Tools > Generate Tables from Entities, which is a situation probably different from the one in the question albeit with a strictly identical error message.

It turns out that the only thing needed to work around it is to hit Project > Clean and select the JPA project in the list. For some unknown reason in my case, cleaning the project is necessary between runs of the Generate Tables command. I can't figure out why but that's the way it is. HTH

Upvotes: 0

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