Hi! I'm having problems running a Google App Engine app (GAE/J) trying to integrate with JPA but I can't make it work. I followed the simple steps of google official tutorial (http://code.google.com/appengine/ docs/java/datastore/jpa/overview.html). I setted up the persistence.xml file in the right place, downloaded the JAR from the SDK and added to my project as external JARs (using Eclipse SDK). I'm currently not using Maven so i'm doing it manually.
When I run the GAE application the following WARNINGs, ERRORs and Exceptions appear on my Console: --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Jan 27, 2011 3:47:11 PM com.google.apphosting.utils.jetty.JettyLogger info INFO: Logging to JettyLogger(null) via com.google.apphosting.utils.jetty.JettyLogger Jan 27, 2011 3:47:11 PM com.google.apphosting.utils.config.AppEngineWebXmlReader readAppEngineWebXml INFO: Successfully processed /home/xxx/project/war/WEB-INF/ appengine-web.xml Jan 27, 2011 3:47:11 PM com.google.apphosting.utils.config.AbstractConfigXmlReader readConfigXml INFO: Successfully processed /home/xxx/project/war/WEB-INF/ web.xml Jan 27, 2011 3:47:28 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions WARNING: Extension Point "org.eclipse.core.resources.natures" not registered, but plugin "org.eclipse.jdt.core" defined in file:/ home/xxx/project/war/WEB-INF/lib/core-3.1.1.jar refers to it. Jan 27, 2011 3:47:28 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions WARNING: Extension Point "org.eclipse.core.resources.builders" not registered, but plugin "org.eclipse.jdt.core" defined in file:/ home/xxx/project/war/WEB-INF/lib/core-3.1.1.jar refers to it. Jan 27, 2011 3:47:28 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions WARNING: Extension Point "org.eclipse.core.resources.markers" not registered, but plugin "org.eclipse.jdt.core" defined in file:/ home/xxx/project/war/WEB-INF/lib/core-3.1.1.jar refers to it. Jan 27, 2011 3:47:28 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions WARNING: Extension Point "org.eclipse.core.resources.markers" not registered, but plugin "org.eclipse.jdt.core" defined in file:/ home/xxx/project/war/WEB-INF/lib/core-3.1.1.jar refers to it. Jan 27, 2011 3:47:28 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions [etc...] WARNING: Extension Point "org.eclipse.core.runtime.contentTypes" not registered, but plugin "org.eclipse.jdt.core" defined in file:/home/xxx/project/war/WEB-INF/ lib/core-3.1.1.jar refers to it. Jan 27, 2011 3:47:28 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions WARNING: Extension Point "org.eclipse.core.runtime.preferences" not registered, but plugin "org.eclipse.jdt.core" defined in file:/home/xxx/project/war/WEB-INF/ lib/core-3.1.1.jar refers to it. Jan 27, 2011 3:47:28 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions WARNING: Extension Point "org.eclipse.core.runtime.preferences" not registered, but plugin "org.eclipse.jdt.core" defined in file:/home/xxx/project/war/WEB-INF/ lib/core-3.1.1.jar refers to it. Jan 27, 2011 3:47:28 PM org.datanucleus.plugin.NonManagedPluginRegistry resolveConstraints SEVERE: Bundle "org.eclipse.jdt.core" requires "org.eclipse.core.resources" but it cannot be resolved. Jan 27, 2011 3:47:28 PM org.datanucleus.plugin.NonManagedPluginRegistry resolveConstraints SEVERE: Bundle "org.eclipse.jdt.core" requires "org.eclipse.core.runtime" but it cannot be resolved. Jan 27, 2011 3:47:28 PM org.datanucleus.plugin.NonManagedPluginRegistry resolveConstraints SEVERE: Bundle "org.eclipse.jdt.core" requires "org.eclipse.text" but it cannot be resolved. Jan 27, 2011 3:47:30 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions WARNING: Extension Point "org.eclipse.core.resources.natures" not registered, but plugin "org.eclipse.jdt.core" defined in file:/ home/xxx/project/war/WEB-INF/lib/core-3.1.1.jar refers to it. Jan 27, 2011 3:47:30 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions WARNING: Extension Point "org.eclipse.core.resources.builders" not registered, but plugin "org.eclipse.jdt.core" defined in file:/ home/xxx/project/war/WEB-INF/lib/core-3.1.1.jar refers to it. Jan 27, 2011 3:47:30 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions WARNING: Extension Point "org.eclipse.core.resources.markers" not registered, but plugin "org.eclipse.jdt.core" defined in file:/ home/xxx/project/war/WEB-INF/lib/core-3.1.1.jar refers to it. Jan 27, 2011 3:47:30 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions WARNING: Extension Point "org.eclipse.core.resources.markers" not registered, but plugin "org.eclipse.jdt.core" defined in file:/ home/xxx/project/war/WEB-INF/lib/core-3.1.1.jar refers to it. Jan 27, 2011 3:47:30 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions WARNING: Extension Point "org.eclipse.core.resources.markers" not registered, but plugin "org.eclipse.jdt.core" defined in file:/ home/xxx/project/war/WEB-INF/lib/core-3.1.1.jar refers to it. Jan 27, 2011 3:47:30 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions [etc...] Jan 27, 2011 3:47:30 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions WARNING: Extension Point "org.eclipse.core.runtime.preferences" not registered, but plugin "org.eclipse.jdt.core" defined in file:/home/xxx/project/war/WEB-INF/ lib/core-3.1.1.jar refers to it. Jan 27, 2011 3:47:30 PM org.datanucleus.plugin.NonManagedPluginRegistry resolveConstraints SEVERE: Bundle "org.eclipse.jdt.core" requires "org.eclipse.core.resources" but it cannot be resolved. Jan 27, 2011 3:47:30 PM org.datanucleus.plugin.NonManagedPluginRegistry resolveConstraints SEVERE: Bundle "org.eclipse.jdt.core" requires "org.eclipse.core.runtime" but it cannot be resolved. Jan 27, 2011 3:47:30 PM org.datanucleus.plugin.NonManagedPluginRegistry resolveConstraints SEVERE: Bundle "org.eclipse.jdt.core" requires "org.eclipse.text" but it cannot be resolved. Jan 27, 2011 3:47:32 PM org.datanucleus.metadata.MetaDataManager initialiseFileMetaDataForUse SEVERE: Found Meta-Data for class escool.model.Person but this class is not enhanced!! Please enhance the class before running DataNucleus. org.datanucleus.exceptions.NucleusUserException: Found Meta- Data for class escool.model.Person but this class is not enhanced!! Please enhance the class before running DataNucleus. at org.datanucleus.metadata.MetaDataManager.initialiseClassMetaData(MetaDataManager.java: 2225) at org.datanucleus.metadata.MetaDataManager.initialiseFileMetaData(MetaDataManager.java: 2176) at org.datanucleus.metadata.MetaDataManager.initialiseFileMetaDataForUse(MetaDataManager.java: 881) at org.datanucleus.metadata.MetaDataManager.loadPersistenceUnit(MetaDataManager.java: 794) at org.datanucleus.jpa.EntityManagerFactoryImpl.initialisePMF(EntityManagerFactoryImpl.java: 488) at org.datanucleus.jpa.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java: 355) at org.datanucleus.store.appengine.jpa.DatastoreEntityManagerFactory.<init>(DatastoreEntityManagerFactory.java: 63) at org.datanucleus.store.appengine.jpa.DatastorePersistenceProvider.createEntityManagerFactory(DatastorePersistenceProvider.java: 35) at javax.persistence.Persistence.createFactory(Persistence.java:172) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java: 112) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java: 66) at escool.controllers.EMF.<clinit>(EMF.java:8) at escool.controllers.HomeController.<init>(HomeController.java:21) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java: 57) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java: 45) at java.lang.reflect.Constructor.newInstance(Constructor.java:532) at com.google.appengine.tools.development.agent.runtime.Runtime.newInstance_(Runtime.java: 112) at com.google.appengine.tools.development.agent.runtime.Runtime.newInstance(Runtime.java: 120) at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java: 126) at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java: 72) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory $3.run(AbstractAutowireCapableBeanFactory.java:943) at java.security.AccessController.doPrivileged(Native Method) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java: 941) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java: 901) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java: 485) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java: 456) at org.springframework.beans.factory.support.AbstractBeanFactory $1.getObject(AbstractBeanFactory.java:291) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java: 222) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java: 288) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java: 190) [etc...] at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java: 306) at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java: 127) at javax.servlet.GenericServlet.init(GenericServlet.java: 212) at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java: 440) at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java: 263) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java: 50) at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java: 685) at org.mortbay.jetty.servlet.Context.startContext(Context.java:140) at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java: 1250) at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java: 517) at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java: 50) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java: 130) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java: 50) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java: 130) at org.mortbay.jetty.Server.doStart(Server.java:224) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java: 50) at com.google.appengine.tools.development.JettyContainerService.startContainer(JettyContainerService.java: 185) at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java: 149) at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java: 219) at com.google.appengine.tools.development.DevAppServerMain $StartAction.apply(DevAppServerMain.java:164) at com.google.appengine.tools.util.Parser $ParseResult.applyArgs(Parser.java:48) at com.google.appengine.tools.development.DevAppServerMain.<init>(DevAppServerMain.java: 113) at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java: 89) Jan 27, 2011 3:47:32 PM org.springframework.web.servlet.FrameworkServlet initServletBean SEVERE: Context initialization failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'homeController' defined in file [/home/ jamoros/laburo/escool/war/WEB-INF/classes/escool/controllers/ HomeController.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [escool.controllers.HomeController]: Constructor threw exception; nested exception is java.lang.ExceptionInInitializerError at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java: 955) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java: 901) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java: 485) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java: 456) at org.springframework.beans.factory.support.AbstractBeanFactory $1.getObject(AbstractBeanFactory.java:291) at [etc...] at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java: 50) at com.google.appengine.tools.development.JettyContainerService.startContainer(JettyContainerService.java: 185) at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java: 149) at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java: 219) at com.google.appengine.tools.development.DevAppServerMain $StartAction.apply(DevAppServerMain.java:164) at com.google.appengine.tools.util.Parser $ParseResult.applyArgs(Parser.java:48) at com.google.appengine.tools.development.DevAppServerMain.<init>(DevAppServerMain.java: 113) at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java: 89) Caused by: org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [escool.controllers.HomeController]: Constructor threw exception; nested exception is java.lang.ExceptionInInitializerError at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java: 141) at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java: 72) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory $3.run(AbstractAutowireCapableBeanFactory.java:943) at java.security.AccessController.doPrivileged(Native Method) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java: 941) ... 37 more Caused by: java.lang.ExceptionInInitializerError at escool.controllers.HomeController.<init>(HomeController.java:21) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java: 57) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java: 45) at java.lang.reflect.Constructor.newInstance(Constructor.java:532) at com.google.appengine.tools.development.agent.runtime.Runtime.newInstance_(Runtime.java: 112) at com.google.appengine.tools.development.agent.runtime.Runtime.newInstance(Runtime.java: 120) at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java: 126) ... 41 more Caused by: javax.persistence.PersistenceException: Provider error. Provider: org.datanucleus.store.appengine.jpa.DatastorePersistenceProvider at javax.persistence.Persistence.createFactory(Persistence.java:176) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java: 112) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java: 66) at escool.controllers.EMF.<clinit>(EMF.java:8) ... 49 more Caused by: org.datanucleus.exceptions.NucleusUserException: Errors were encountered when initialising the specified MetaData. See the nested exceptions for details at org.datanucleus.metadata.MetaDataManager.initialiseFileMetaDataForUse(MetaDataManager.java: 892) at org.datanucleus.metadata.MetaDataManager.loadPersistenceUnit(MetaDataManager.java: 794) at org.datanucleus.jpa.EntityManagerFactoryImpl.initialisePMF(EntityManagerFactoryImpl.java: 488) at org.datanucleus.jpa.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java: 355) at org.datanucleus.store.appengine.jpa.DatastoreEntityManagerFactory.<init>(DatastoreEntityManagerFactory.java: 63) at org.datanucleus.store.appengine.jpa.DatastorePersistenceProvider.createEntityManagerFactory(DatastorePersistenceProvider.java: 35) at javax.persistence.Persistence.createFactory(Persistence.java:172) ... 52 more Caused by: org.datanucleus.exceptions.NucleusUserException: Found Meta-Data for class escool.model.Person but this class is not enhanced!! Please enhance the class before running DataNucleus. at org.datanucleus.metadata.MetaDataManager.initialiseClassMetaData(MetaDataManager.java: 2225) at org.datanucleus.metadata.MetaDataManager.initialiseFileMetaData(MetaDataManager.java: 2176) at org.datanucleus.metadata.MetaDataManager.initialiseFileMetaDataForUse(MetaDataManager.java: 881) ... 58 more Jan 27, 2011 3:47:32 PM com.google.appengine.tools.development.ApiProxyLocalImpl log SEVERE: javax.servlet.ServletContext log: unavailable org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'homeController' defined in file [/home/ jamoros/laburo/escool/war/WEB-INF/classes/escool/controllers/ HomeController.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [escool.controllers.HomeController]: Constructor threw exception; nested exception is java.lang.ExceptionInInitializerError at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java: 955) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java: 901) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java: 485) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java: 456) at org.springframework.beans.factory.support.AbstractBeanFactory $1.getObject(AbstractBeanFactory.java:291) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java: 222) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java: 288) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java: 190) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java: 563) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java: 872) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java: 423) at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java: 442) at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java: 458) at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java: 339) at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java: 306) at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java: 127) at javax.servlet.GenericServlet.init(GenericServlet.java:212) at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java: 440) at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java: 263) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java: 50) at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java: 685) at org.mortbay.jetty.servlet.Context.startContext(Context.java:140) at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java: 1250) at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java: 517) at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java: 50) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java: 130) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java: 50) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java: 130) at org.mortbay.jetty.Server.doStart(Server.java:224) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java: 50) at com.google.appengine.tools.development.JettyContainerService.startContainer(JettyContainerService.java: 185) at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java: 149) at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java: 219) at com.google.appengine.tools.development.DevAppServerMain $StartAction.apply(DevAppServerMain.java:164) at com.google.appengine.tools.util.Parser $ParseResult.applyArgs(Parser.java:48) at com.google.appengine.tools.development.DevAppServerMain.<init>(DevAppServerMain.java: 113) at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java: 89) Caused by: org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [escool.controllers.HomeController]: Constructor threw exception; nested exception is java.lang.ExceptionInInitializerError at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java: 141) at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java: 72) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory $3.run(AbstractAutowireCapableBeanFactory.java:943) at java.security.AccessController.doPrivileged(Native Method) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java: 941) ... 37 more Caused by: java.lang.ExceptionInInitializerError at escool.controllers.HomeController.<init>(HomeController.java:21) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java: 57) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java: 45) at java.lang.reflect.Constructor.newInstance(Constructor.java:532) at com.google.appengine.tools.development.agent.runtime.Runtime.newInstance_(Runtime.java: 112) at com.google.appengine.tools.development.agent.runtime.Runtime.newInstance(Runtime.java: 120) at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java: 126) ... 41 more Caused by: javax.persistence.PersistenceException: Provider error. Provider: org.datanucleus.store.appengine.jpa.DatastorePersistenceProvider at javax.persistence.Persistence.createFactory(Persistence.java:176) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java: 112) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java: 66) at escool.controllers.EMF.<clinit>(EMF.java:8) ... 49 more Caused by: org.datanucleus.exceptions.NucleusUserException: Errors were encountered when initialising the specified MetaData. See the nested exceptions for details at org.datanucleus.metadata.MetaDataManager.initialiseFileMetaDataForUse(MetaDataManager.java: 892) at org.datanucleus.metadata.MetaDataManager.loadPersistenceUnit(MetaDataManager.java: 794) at org.datanucleus.jpa.EntityManagerFactoryImpl.initialisePMF(EntityManagerFactoryImpl.java: 488) at org.datanucleus.jpa.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java: 355) at org.datanucleus.store.appengine.jpa.DatastoreEntityManagerFactory.<init>(DatastoreEntityManagerFactory.java: 63) at org.datanucleus.store.appengine.jpa.DatastorePersistenceProvider.createEntityManagerFactory(DatastorePersistenceProvider.java: 35) at javax.persistence.Persistence.createFactory(Persistence.java:172) ... 52 more Caused by: org.datanucleus.exceptions.NucleusUserException: Found Meta-Data for class escool.model.Person but this class is not enhanced!! Please enhance the class before running DataNucleus. at org.datanucleus.metadata.MetaDataManager.initialiseClassMetaData(MetaDataManager.java: 2225) at org.datanucleus.metadata.MetaDataManager.initialiseFileMetaData(MetaDataManager.java: 2176) at org.datanucleus.metadata.MetaDataManager.initialiseFileMetaDataForUse(MetaDataManager.java: 881) ... 58 more Jan 27, 2011 3:47:32 PM com.google.appengine.tools.development.DevAppServerImpl start INFO: The server is running at http://localhost:8888/ --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- After this the app starts, but the JPA example that i have doesn't work... What i'm doing wrong? What is this error? Do I need to configure anything else? Download a plugin ? Any idea... Any happy tutorial ? 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