im developing a standalone application and it works fine when starting it from my ide(intellij idea), but after creating an uberjar and start the application from it javax.persistence.spi.PersistenceProvider is thrown saying "No Persistence provider for EntityManager named testPU"

here is my persistence.xml which is placed under meta-inf directory:

 <persistence-unit name="testPU" transaction-type="RESOURCE_LOCAL">
     <provider>org.hibernate.ejb.HibernatePersistence</provider>
     <class>test.model.Configuration</class>
     <properties>
         <property name="hibernate.connection.username" value="root"/>
         <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
         <property name="hibernate.connection.password" value="root"/>
         <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/test"/>
         <property name="hibernate.show_sql" value="true"/>
         <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLInnoDBDialect"/>
         <property name="hibernate.c3p0.timeout" value="300"/>
         <property name="hibernate.hbm2ddl.auto" value="update"/>
     </properties>
 </persistence-unit>

and here is how im creating the entity manager factory:

emf = Persistence.createEntityManagerFactory("testPU");

im using maven and tried the assembly plug-in with the default configuration fot it, i dont have much experience with assembling jars and i dont know if im missing something, so if u have any ideas ill be glad to hear them