javax.persistence.PersistenceException: No Persistence provider for EntityManager

[Tim Sangster]

Hello,

I made a site with jsp's and servlets. Using a model which was saved using arraylists.
Than I persisted this model, using a Main class I tested all the methods I created.
Now I need to use this persisted model in my site.
But,
I seemed to have forgotten some of the links or made some wrongs one.
Because whenever I go to the any second page of my site and the servlet gets a request, it crashes.
This is because it try's getInstance() of my db which creates an entitymaneger.
It crashes on this line:
emf = Persistence.createEntityManagerFactory("BackPackPersistencyModelPU");
This is the full error:

WARNING: StandardWrapperValve[PlayerServlet]: PWC1382: Allocate exception for servlet PlayerServlet
com.sun.enterprise.container.common.spi.util.InjectionException: Error creating managed object for class controller.PlayerServlet
        at com.sun.enterprise.container.common.impl.util.InjectionManagerImpl.createManagedObject(InjectionManagerImpl.java:312)
        at com.sun.enterprise.web.WebContainer.createServletInstance(WebContainer.java:709)
        at com.sun.enterprise.web.WebModule.createServletInstance(WebModule.java:1937)
        at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1252)
        at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:1059)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:187)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)
        at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)
        at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)
        at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:325)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:226)
        at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165)
        at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
        at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
        at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
        at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
        at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
        at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
        at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
        at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
        at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
        at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
        at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
        at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
        at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
        at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at com.sun.enterprise.container.common.impl.util.InjectionManagerImpl.createManagedObject(InjectionManagerImpl.java:303)
        ... 27 more
Caused by: javax.persistence.PersistenceException: No Persistence provider for EntityManager named BackPackPersistencyModelPU
        at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:84)
        at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
        at Player.db.PlayerDB.<init>(PlayerDB.java:38)
        at Player.db.PlayerDB.getInstance(PlayerDB.java:30)
        at controller.PlayerServlet.<init>(PlayerServlet.java:19)
        ... 32 more

This is my persistence.xml:

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" 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_1_0.xsd">
  <persistence-unit name="BackPackPersistencyModelPU" transaction-type="RESOURCE_LOCAL">
    <provider>oracle.toplink.essentials.PersistenceProvider</provider>
    <class>Player.Block</class>
    <class>Player.Item</class>
    <class>Player.Player</class>
    <properties>
      <property name="toplink.jdbc.user" value="app"/>
      <property name="toplink.jdbc.password" value="app"/>
      <property name="toplink.jdbc.url" value="jdbc:derby://localhost:1527/BackPackModelDB;create=true"/>
      <property name="toplink.jdbc.driver" value="org.apache.derby.jdbc.ClientDriver"/>
      <property name="toplink.ddl-generation" value="create-tables"/>
    </properties>
  </persistence-unit>
</persistence>

Do I have to put my xml somewhere in the web project? I tried various places.
Right now I simple have the jar of the model in my library of the web project.
I have put my entire project in dropbox just in case I didn't include enough information,
this is the public link: http://dl.dropbox.com/u/16098795/BackPackManagerPersisted.war

Any help is GREATLY appreciated!
Thanks in advance!

[David O'Meara]

Somewhere you need to make the EntityManagerFactory and subsequent EntityManager available within the web context.
eg http://javanotepad.blogspot.com/2007/05/jpa-entitymanagerfactory-in-web.html
(I haven't read all of that article, I hope it says everything I want it to ;) )

[Tim Sangster]

David O'Meara wrote:Somewhere you need to make the EntityManagerFactory and subsequent EntityManager available within the web context.
eg http://javanotepad.blogspot.com/2007/05/jpa-entitymanagerfactory-in-web.html
(I haven't read all of that article, I hope it says everything I want it to ;) )

I'm trying to implement this but I create my entity manager in my model and the contextlistener needs to be in the web project.
I don't really get how to link those two.

[James Sutherland]

What version of Glassfish are you using? The latest version using EclipseLink not TopLink Essentials.

Try removing the <provider> tag, you may not have TopLink Essentials on the classpath.