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I'm not able to get this persistence file correct... I do not find any more information in the book that I use as a guide. I'm using a MySQL database.
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="a11_DA_g5_PU" transaction-type="JTA">
<jta-data-source>a11_DA_g5</jta-data-source>
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<class>entities.Book</class>
<class>entities.Author</class>
<class>entities.Customer</class>
<class>entities.Membership</class>
<properties>
<property name="eclipselink.target-database" value="DERBY"/>
<property name="javax.persistence.jdbc.driver" value="org.apache.derby.jdbc.ClientDriver"/>
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://studev.groept.be:3306/a11_DA_g5"/>
<property name="javax.persistence.jdbc.user" value="a11_DA_g5"/>
<property name="javax.persistence.jdbc.password" value="passwordhere"/>
<property name="eclipselink.ddl-generation" value="create-tables"/>
</properties>
</persistence-unit>
</persistence>
EDIT
SEVERE: DPL8015: Invalid Deployment Descriptors in Deployment descriptor file META-INF/persistence.xml in archive [EJBModule_jar]. Line 6 Column 15 -- cvc-complex-type.2.4.a: Invalid content was found starting with element 'provider'. One of '{"http://java.sun.com/xml/ns/persistence":shared-cache-mode, "http://java.sun.com/xml/ns/persistence":validation-mode, "http://java.sun.com/xml/ns/persistence":properties}' is expected.
SEVERE: DPL8005: Deployment Descriptor parsing failure : cvc-complex-type.2.4.a: Invalid content was found starting with element 'provider'. One of '{"http://java.sun.com/xml/ns/persistence":shared-cache-mode, "http://java.sun.com/xml/ns/persistence":validation-mode, "http://java.sun.com/xml/ns/persistence":properties}' is expected.
SEVERE: Exception while deploying the app [VaadinTestApp]
SEVERE: org.xml.sax.SAXParseException: cvc-complex-type.2.4.a: Invalid content was found starting with element 'provider'. One of '{"http://java.sun.com/xml/ns/persistence":shared-cache-mode, "http://java.sun.com/xml/ns/persistence":validation-mode, "http://java.sun.com/xml/ns/persistence":properties}' is expected. java.io.IOException: org.xml.sax.SAXParseException: cvc-complex-type.2.4.a: Invalid content was found starting with element 'provider'. One of '{"http://java.sun.com/xml/ns/persistence":shared-cache-mode, "http://java.sun.com/xml/ns/persistence":validation-mode, "http://java.sun.com/xml/ns/persistence":properties}' is expected.
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The persistence. xml file is a standard configuration file in JPA. It has to be included in the META-INF directory inside the JAR file that contains the entity beans. The persistence. xml file must define a persistence-unit with a unique name in the current scoped classloader.
In the Package Explorer view, right-click the persistence. xml file of the JPA project that you want to edit and select Open with > Persistence XML Editor. In the Design tab of the Persistence XML Editor, make any of the following changes to the persistence.
If you package the persistence unit as a set of classes in a WAR file, persistence. xml should be located in the WAR file's WEB-INF/classes/META-INF directory.
Spring Boot will not search for or use a META-INF/persistence. xml by default. If you prefer to use a traditional persistence. xml , you need to define your own @Bean of type LocalEntityManagerFactoryBean (with an ID of 'entityManagerFactory') and set the persistence unit name there.
Order of elements inside <persistence-unit> is important, <jta-data-source> should go after <provider>:
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<jta-data-source>a11_DA_g5</jta-data-source>
As the XSD says, the <provider> element must come before the <jta-data-source> element.
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