Problème de configuration persistence.xml maven

Bonjour à tous.

Un souci au niveau de la config de mon app. Mon fichier persistence se trouver sur: src/main/resources/META-INF/persistence.xml, j'ai le fichier de ressource glassfish qui se trouver sur src/main/webapp/WEB-INF/glassfish-resources.xml. Voici le contenu du pom.xml

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...
 <resources>
            <resource>
                <directory>src/main/resources</directory>
                <filtering>true</filtering>
                <includes>
                    <include>**/*.sql</include>
                    <include>**/*.properties</include>
                </includes>
            </resource>
        </resources>
...

A la compilation tous se passent très, sauf que à l'exécution je reçois le message suivant:

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Caused by: java.lang.IllegalStateException: Unable to retrieve EntityManagerFactory for unitName PriorisPU
	at com.sun.enterprise.container.common.impl.EntityManagerWrapper.init(EntityManagerWrapper.java:138)
	at com.sun.enterprise.container.common.impl.EntityManagerWrapper._getDelegate(EntityManagerWrapper.java:171)
	at com.sun.enterprise.container.common.impl.EntityManagerWrapper.createNamedQuery(EntityManagerWrapper.java:521)
	at be.project.prioris.ejb.UserFacade.findbyLogin(UserFacade.java:119)

Le contenu du fichier persistence.xml

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<?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="PriorisPU" transaction-type="JTA">
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
    <jta-data-source>java:app/jdbc/prioris</jta-data-source>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties>
      <!-- Register custom uuid generator -->
      <property name="eclipselink.session.customizer" value="be.project.prioris.utils.UUIDSequence"/>
      <!-- Properties set to show SQL statements -->
      <property name="eclipselink.logging.level.sql" value="FINEST"/>
      <property name="eclipselink.logging.parameters" value="true"/>
      <property name="javax.persistence.schema-generation.database.action" value="create"/>
    </properties>
  </persistence-unit>
</persistence>

Le fichier glassfish-resources.xml

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE resources PUBLIC "-//GlassFish.org//DTD GlassFish Application Server 3.1 Resource Definitions//EN" "http://glassfish.org/dtds/glassfish-resources_1_5.dtd">
<resources>
    <jdbc-connection-pool allow-non-component-callers="false" associate-with-thread="false" 
                          connection-creation-retry-attempts="0" connection-creation-retry-interval-in-seconds="10" 
                          connection-leak-reclaim="false" connection-leak-timeout-in-seconds="0" 
                          connection-validation-method="auto-commit" datasource-classname="org.postgresql.ds.PGSimpleDataSource" 
                          fail-all-connections="false" idle-timeout-in-seconds="300" is-connection-validation-required="false" 
                          is-isolation-level-guaranteed="true" lazy-connection-association="false" lazy-connection-enlistment="false" 
                          match-connections="false" max-connection-usage-count="0" max-pool-size="32" max-wait-time-in-millis="60000" 
                          name="priorisPool" non-transactional-connections="false" pool-resize-quantity="2" 
                          res-type="javax.sql.DataSource" statement-timeout-in-seconds="-1" steady-pool-size="8" 
                          validate-atmost-once-period-in-seconds="0" wrap-jdbc-objects="false">             
 
            <!-- local configuration -->
            <property name="serverName" value="localhost"/>
            <property name="portNumber" value="5432"/>
            <property name="databaseName" value="prioris"/>
            <property name="User" value="***"/>
            <property name="Password" value="***"/>
            <property name="URL" value="jdbc:postgresql://localhost:5432/***"/>
            <property name="driverClass" value="org.postgresql.Driver"/>
    </jdbc-connection-pool>
 
    <jdbc-resource enabled="true" jndi-name="java:app/jdbc/prioris" object-type="user" pool-name="priorisPool"/>
 
</resources>

PS: Si le fichier de persistence est renseigné directement c'est à dire en y ajoutant /META-INF/, l'erreur se reproduit à l'exécution.

Quelqu'un à une idée du problème?