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POError when creating EntityManager in JPA2
 

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  1. POError when creating EntityManager in JPA2
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    <p>I'm trying to create a simple JPA2 app that persists something to a database using the OpenJPA implementation. I'm running Derby and using the default Embedded JDBC Driver. I've been scratching my head over this trying to figure out what's missing. I'm sure it's something trivial, but if someone could look this over and point me in the right direction, I'd be really greatful. Thanks.</p> <p>Here's my persistence.xml: </p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;persistence version="2.0" 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_2_0.xsd"&gt; &lt;persistence-unit name="HelloWorld"&gt; &lt;jta-data-source&gt;java:comp/env/StuffDerby&lt;/jta-data-source&gt; &lt;class&gt;helloworld.entities.Employee&lt;/class&gt; &lt;/persistence-unit&gt; &lt;/persistence&gt; </code></pre> <p>and when I run this code:</p> <pre><code>EntityManagerFactory emf = Persistence.createEntityManagerFactory("HelloWorld"); EntityManager em = emf.createEntityManager(); </code></pre> <p>It fails when calling the createEntityManager() method. </p> <pre><code>406 HelloWorld INFO [WebContainer : 0] openjpa.Runtime - Starting OpenJPA 2.0.0 [1/11/11 12:46:21:377 PST] 0000002f servlet E com.ibm.ws.webcontainer.servlet.ServletWrapper service SRVE0068E: Uncaught exception created in one of the service methods of the servlet HelloServlet in application HelloWorld. Exception created : &lt;openjpa-2.0.0-r422266:935683 nonfatal general error&gt; org.apache.openjpa.persistence.PersistenceException: java.lang.String incompatible with javax.sql.DataSource at org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:208) at org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(DelegatingBrokerFactory.java:156) at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:213) at com.ibm.ws.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:45) at com.ibm.ws.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:30) at helloworld.entities.controller.EmployeeManager.getEntityManager(EmployeeManager.java:37) at helloworld.entities.controller.EmployeeManager.getEmployee(EmployeeManager.java:188) at helloworld.HelloServlet.doGet(HelloServlet.java:47) at javax.servlet.http.HttpServlet.service(HttpServlet.java:718) at javax.servlet.http.HttpServlet.service(HttpServlet.java:831) at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1661) at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1595) at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:131) at com.ibm.ws.osgi.web.extender.OsgiDirectoryProtectionFilter.doFilter(OsgiDirectoryProtectionFilter.java:94) at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:188) at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:116) at com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:77) at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:908) at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:932) at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:500) at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:178) at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3826) at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:276) at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:931) at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1583) at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:186) at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:455) at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:384) at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:272) at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214) at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113) at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165) at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217) at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161) at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138) at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204) at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775) at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905) at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1550) Caused by: java.lang.ClassCastException: java.lang.String incompatible with javax.sql.DataSource at org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl.createConnectionFactory(JDBCConfigurationImpl.java:834) at org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl.getDBDictionaryInstance(JDBCConfigurationImpl.java:594) at org.apache.openjpa.jdbc.meta.MappingRepository.endConfiguration(MappingRepository.java:1489) at org.apache.openjpa.lib.conf.Configurations.configureInstance(Configurations.java:507) at org.apache.openjpa.lib.conf.Configurations.configureInstance(Configurations.java:432) at org.apache.openjpa.lib.conf.PluginValue.instantiate(PluginValue.java:104) at org.apache.openjpa.conf.MetaDataRepositoryValue.instantiate(MetaDataRepositoryValue.java:68) at org.apache.openjpa.lib.conf.ObjectValue.instantiate(ObjectValue.java:83) at org.apache.openjpa.conf.OpenJPAConfigurationImpl.newMetaDataRepositoryInstance(OpenJPAConfigurationImpl.java:939) at org.apache.openjpa.conf.OpenJPAConfigurationImpl.getMetaDataRepositoryInstance(OpenJPAConfigurationImpl.java:930) at org.apache.openjpa.kernel.AbstractBrokerFactory.makeReadOnly(AbstractBrokerFactory.java:626) at org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:193) ... 38 more </code></pre>
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    1. USstuff22
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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      1. POError when creating EntityManager in JPA2
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
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      1. POError when creating EntityManager in JPA2
      1. This table or related slice is empty.
      1. VTUpMod
    1. COlooks to me like the thing at the jndi reference is a string, not a datasource. are you sure that in the jndi population bit that you are not putting a string with the jndi reference of the datasource, rather than the result of the lookup of that name (you don't post it so i can't see). There should be some j2ee mumbo jumbo about resource ref or something.
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      1. POError when creating EntityManager in JPA2
      1. UStime4tea
 

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