JPA not generating ddl files - jpa

Question

I'm setting up a JavaEE Webapplication and want to generate ddl files so I can see what they look like
<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://xmlns.jcp.org/xml/ns/persistence"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence"
version="2.1">
<persistence-unit name="contentAggregatorPU">
<class>contentAggregator.model.Item</class>
<properties>
<property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/>
<property name="javax.persistence.schema-generation.scripts.action" value="drop-and-create"/>
<property name="javax.persistence.schema-generation.scripts.create-target" value="contentAggregatorCreate.ddl"/>
<property name="javax.persistence.schema-generation.scripts.drop-target" value="contentAggregatorDrop.ddl"/>
</properties>
</persistence-unit>
</persistence>
It just does not generate the files.

Answer 1

Honestly I never used the mechanism. While it seems to work for my local-resource minimal JPA playground it gave me errors when attempting to deploy to wildfly. I've always used a small utility class for generating a schema.
public class SchemaTranslator {
public static void main(String[] args) throws IOException {
Class<?>[] entityClasses = {
Class1.class,
Class2.class,
};
MetadataSources metadata = new MetadataSources(new StandardServiceRegistryBuilder()
.applySetting("hibernate.hbm2ddl.auto", "create")
.applySetting("hibernate.dialect", "org.hibernate.dialect.MySQL5InnoDBDialect")
// .applySetting("hibernate.physical_naming_strategy", "package.MyImprovedNamingStrategy")
.build()
);
// [...] adding annotated classes to metadata here...
for (Class<?> clazz : entityClasses)
metadata.addAnnotatedClass(clazz);
EnumSet<TargetType> targetTypes = EnumSet.of(TargetType.STDOUT, TargetType.SCRIPT);
SchemaExport export = new SchemaExport()
// .setHaltOnError( haltOnError )
.setOutputFile("db-schema.sql")
.setDelimiter(";");
export.create(targetTypes, (MetadataImplementor) metadata.buildMetadata());
}
}