Überwintern: Nicht auf TransactionManager oder UserTransaction zur physischen Transaktion delegieren

War ich mit Servlets, PostgreSQL und Hibernate EntityManager zu bauen, eine Web-app und alles lief ok, bis ich zog das Projekt zu einem Maven basierten Projekt. Jetzt bin ich immer dieses seltsame Ausnahme, jedes mal, wenn ich versuche zu erstellen EntityManager von einer EntityManagerFactory :

org.hibernate.resource.transaction.backend.jta.internal.JtaPlatformInaccessibleException: Unable to access TransactionManager or UserTransaction to make physical transaction delegate
at org.hibernate.resource.transaction.backend.jta.internal.JtaTransactionCoordinatorImpl.makePhysicalTransactionDelegate(JtaTransactionCoordinatorImpl.java:229)
at org.hibernate.resource.transaction.backend.jta.internal.JtaTransactionCoordinatorImpl.getTransactionDriverControl(JtaTransactionCoordinatorImpl.java:203)
at org.hibernate.engine.transaction.internal.TransactionImpl.<init>(TransactionImpl.java:36)
at org.hibernate.internal.AbstractSessionImpl.getTransaction(AbstractSessionImpl.java:309)
at org.hibernate.internal.SessionImpl.<init>(SessionImpl.java:277)
at org.hibernate.internal.SessionFactoryImpl$SessionBuilderImpl.openSession(SessionFactoryImpl.java:1322)
at org.hibernate.jpa.internal.EntityManagerImpl.internalGetSession(EntityManagerImpl.java:133)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.postInit(AbstractEntityManagerImpl.java:174)
at org.hibernate.jpa.internal.EntityManagerImpl.<init>(EntityManagerImpl.java:83)
at org.hibernate.jpa.internal.EntityManagerFactoryImpl.internalCreateEntityManager(EntityManagerFactoryImpl.java:311)
at org.hibernate.jpa.internal.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:278)
at cl.bicubic.App.getEntityManager(App.java:100)
at cl.bicubic.dao.DAO.<init>(DAO.java:24)
at cl.bicubic.dao.UserAtomicDAO.<init>(UserAtomicDAO.java:15)
at cl.bicubic.Application.init(Application.java:70)
at javax.servlet.GenericServlet.init(GenericServlet.java:158)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1241)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1154)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:827)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:135)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:526)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:655)
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1566)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1523)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)

Hier ist die Konfiguration von Hibernate in die Persistenz-unit:

<properties>
    <property name="hibernate.connection.url" value="jdbc:postgresql://localhost/mydb?charSet=UTF-8"/>
    <property name="hibernate.connection.user" value="dbuser"/>
    <property name="hibernate.connection.password" value="dbpass"/>
    <property name="hibernate.connection.driver_class" value="org.postgresql.Driver"/>
    <property name="hibernate.connection.provider_class" value="org.hibernate.connection.C3P0ConnectionProvider"/>
    <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQL9Dialect"/>
    <property name="hibernate.c3p0.min_size" value="5"/>
    <property name="hibernate.c3p0.max_size" value="20"/>
    <property name="hibernate.c3p0.timeout" value="1800"/>
    <property name="hibernate.c3p0.max_statements" value="50"/>
    <property name="hibernate.connection.charSet" value="UTF-8"/>
    <property name="hibernate.hbm2ddl.auto" value="update"/>
    <property name="hibernate.id.new_generator_mappings" value="true"/>
    <property name="hibernate.show_sql" value="true"/>
    <property name="hibernate.format_sql" value="true"/>
</properties>

Dies ist, wie ich das erstellen der EntityManagerFactory:

public class App {
    ...
    private static EntityManagerFactory entityManagerFactory;
    ...
    public static void setServletContext(ServletContext context) throws IOException {
         ...
         entityManagerFactory = Persistence.createEntityManagerFactory("persistence-unit-name");
         ...
    }
    ...
    public static EntityManager getEntityManager() {
        return entityManagerFactory.createEntityManager(); //Here Throws the Exception
    }
    ...
}

Rufe ich diese Methode mit einem ServletContextListener

@WebListener
public class ApplicationServletContextListener implements ServletContextListener {

    @Override
    public void contextInitialized(ServletContextEvent sce) {
        try {
            App.setServletContext(sce.getServletContext());
        } catch (Exception ex) {
           Logger.getLogger(ApplicationServletContextListener.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    ...

}

Dies ist, wie ich versuchen zu erstellen EntityManager

public class DAO {
    ...
    protected EntityManager entityManager;
    ...
    public DAO() {
        entityManager = App.getEntityManager();
        ...
    }

    ...
}

Ich habe versucht, mehr Informationen über die Herkunft dieser JtaPlatformInaccessibleException, aber ich habe nichts gefunden. Ich bin mir nicht sicher, was fehlt.

InformationsquelleAutor keymaker | 2015-09-10