allright. your push made me look into it a little deeper :-) My solution to the "NoClassDefFoundError: java.io.FileOutputStream is a restricted class" is disabling the usage of Google's App engine under Project - Properties | Google | App Engine | Use Google App Engine --> uncheck
After that i got "ClassCastException: org.datanucleus.store.rdbms.RDBMSManager cannot be cast to org.datanucleus.store.appengine.DatastoreManager" which made me banning the datanucleus-appengine-1.0.8.final.jar from the projects classpath as well. I have no clue if this is a good idea, but my code is running so far and I am able to make calls to the Derby database. Which brings me back to my other question: Is it utterly impossible to have the persistence layer running with OpenJPA along with a GWT frontend? As I fear Apache James is dependent on its familiar JPA technology. again, thanks for your advice. you helped me loads alltogether I spent already a week on these issues, and I'm craving for answers cheers On 30 Mai, 14:48, Patrick Julien <[email protected]> wrote: > I think that's specific enough: > > "Caused by: java.lang.NoClassDefFoundError: java.io.FileOutputStream > is a restricted class. Please see the Google App Engine developer's > guide for more details." > > > > > > > > On Mon, May 30, 2011 at 4:29 AM, roman <[email protected]> wrote: > > Thank you for your quick response. > > I followed your advise and changed the underlying technology of my JPA > > layer to DataNucleus. > > > But i ran into a different problem > > > log4j:WARN No appenders could be found for logger > > (DataNucleus.Connection). > > log4j:WARN Please initialize the log4j system properly. > > [ERROR] javax.servlet.ServletContext log: unavailable > > javax.persistence.PersistenceException: Provider error. Provider: > > org.datanucleus.store.appengine.jpa.DatastorePersistenceProvider > > at javax.persistence.Persistence.createFactory(Persistence.java:176) > > ... > > at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) > > at > > org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java: > > 409) > > at org.mortbay.thread.QueuedThreadPool > > $PoolThread.run(QueuedThreadPool.java:582) > > Caused by: javax.jdo.JDOFatalInternalException: Unexpected exception > > caught. > > NestedThrowables: > > java.lang.reflect.InvocationTargetException > > at > > javax.jdo.JDOHelper.invokeGetPersistenceManagerFactoryOnImplementation(JDOHelper.java: > > 1186) > > at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java: > > 803) > > at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java: > > 698) > > ... > > Caused by: java.lang.NoClassDefFoundError: java.io.FileOutputStream is > > a restricted class. Please see the Google App Engine developer's > > guide for more details. > > at > > com.google.appengine.tools.development.agent.runtime.Runtime.reject(Runtime.java: > > 51) > > at > > org.apache.derby.impl.services.stream.SingleStream.PBmakeFileHPW(Unknown > > Source) > > at org.apache.derby.impl.services.stream.SingleStream.run(Unknown > > Source) > > > Well I see that i probably have got an error in the configuration of > > the DataStorePersistenceProvider. Unfortunately, I am not sure what > > the error could be. Is there any way to get a more specific > > description of what is causing the problem? > > > cheers, roman > > > On 27 Mai, 15:28, Patrick Julien <[email protected]> wrote: > >> If you wan't to use JPA with AppEngine, you have to use the JPA that > >> comes with AppEngine which is based on datanucleus. See > > >>http://code.google.com/appengine/docs/java/datastore/jpa/overview.html > > >> for an overview > > >> On Fri, May 27, 2011 at 5:56 AM, roman <[email protected]> wrote: > >> > Hi, > >> > I'm trying to implement a UserManagement based on GoogleWebToolkit > >> > (Adding, deleting, assigning privileged; nothing special there). The > >> >GWT-module is using a serparate persistence module, which I included > >> > as a jar-file and which is based onOpenJPA. > > >> > The persistence layer is working fine as long is I run it standalone. > >> > But when I wire it to myGWTproject, I can't create the > >> > EntityManagerFactory any more. I get a NullPointerException in one of > >> > theOpenJPAclasses, which I think is because that Google App Engine > >> > replaced the default java.lang.ClassLoader. > > >> > Is it a bad idea to useOpenJPAwithGWT? Is there anything to > >> > consider when combining these libraries? > > >> > For better understanding find the source code attached. > >> > Any help would be greatly appreciated. > >> > thx, roman > > >> > The server is running athttp://localhost:8888/ > >> > [WARN] Error for /usermgmtui/userInformation > >> > java.lang.ExceptionInInitializerError > >> > at > >> > org.apache.openjpa.kernel.Bootstrap.invokeFactory(Bootstrap.java: > >> > 116) > >> > at > >> > org.apache.openjpa.kernel.Bootstrap.getBrokerFactory(Bootstrap.java: > >> > 96) > >> > at > >> > org.apache.openjpa.persistence.OpenJPAPersistence.getEntityManagerFactory(OpenJPAPersistence.java: > >> > 92) > >> > at > >> > com.mycompany.commons.jpa.JpaUserManagement.<init>(JpaUserManagement.java: > >> > 64) > >> > at > >> > com.mycompany.commons.UserManagementImpl.setDatasoure(UserManagementImpl.java: > >> > 71) > >> > at > >> > com.mycompany.ui.server.UserInformationServiceImpl.<init>(UserInformationServiceImpl.java: > >> > 36) > >> > at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native > >> > Method) > >> > at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown > >> > Source) > >> > at > >> > sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown > >> > Source) > >> > at java.lang.reflect.Constructor.newInstance(Unknown Source) > >> > at java.lang.Class.newInstance0(Unknown Source) > >> > at java.lang.Class.newInstance(Unknown Source) > >> > at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153) > >> > at > >> > org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java: > >> > 428) > >> > at > >> > org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java: > >> > 339) > >> > at > >> > org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java: > >> > 487) > >> > at org.mortbay.jetty.servlet.ServletHandler > >> > $CachedChain.doFilter(ServletHandler.java:1166) > >> > at > >> > com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java: > >> > 35) > >> > at org.mortbay.jetty.servlet.ServletHandler > >> > $CachedChain.doFilter(ServletHandler.java:1157) > >> > at > >> > com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java: > >> > 58) > >> > at org.mortbay.jetty.servlet.ServletHandler > >> > $CachedChain.doFilter(ServletHandler.java:1157) > >> > at > >> > com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java: > >> > 43) > >> > at org.mortbay.jetty.servlet.ServletHandler > >> > $CachedChain.doFilter(ServletHandler.java:1157) > >> > at > >> > com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java: > >> > 122) > >> > at org.mortbay.jetty.servlet.ServletHandler > >> > $CachedChain.doFilter(ServletHandler.java:1157) > >> > at > >> > com.google.appengine.tools.development.BackendServersFilter.doFilter(BackendServersFilter.java: > >> > 94) > >> > at org.mortbay.jetty.servlet.ServletHandler > >> > $CachedChain.doFilter(ServletHandler.java:1157) > >> > at > >> > org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java: > >> > 388) > >> > at > >> > org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java: > >> > 216) > >> > at > >> > org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java: > >> > 182) > >> > at > >> > org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java: > >> > 765) > >> > at > >> > org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java: > >> > 418) > >> > at > >> > com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java: > >> > 70) > >> > at > >> > org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java: > >> > 152) > >> > at com.google.appengine.tools.development.JettyContainerService > >> > $ApiProxyHandler.handle(JettyContainerService.java:351) > >> > at > >> > org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java: > >> > 152) > >> > at org.mortbay.jetty.Server.handle(Server.java:326) > >> > at > >> > org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java: > >> > 542) > >> > at org.mortbay.jetty.HttpConnection > >> > $RequestHandler.content(HttpConnection.java:938) > >> > at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755) > >> > at > >> > org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218) > >> > at > >> > org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) > >> > at > >> > org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java: > >> > 409) > >> > at org.mortbay.thread.QueuedThreadPool > >> > $PoolThread.run(QueuedThreadPool.java:582) > >> > Caused by: java.lang.reflect.UndeclaredThrowableException > >> > at $Proxy29.recordAppClassLoader(Unknown Source) > >> > at > >> > com.google.appengine.tools.development.agent.runtime.Runtime.recordClassLoader(Runtime.java: > >> > 47) > >> > at > >> > org.apache.openjpa.lib.util.MultiClassLoader.<init>(MultiClassLoader.java: > >> > 60) > >> > at org.apache.openjpa.lib.util.J2DoPrivHelper > >> > $47.run(J2DoPrivHelper.java:1011) > >> > at org.apache.openjpa.lib.util.J2DoPrivHelper > >> > $47.run(J2DoPrivHelper.java:1009) > >> > at java.security.AccessController.doPrivileged(Native Method) > >> > at > >> > org.apache.openjpa.lib.conf.ProductDerivations.<clinit>(ProductDerivations.java: > >> > 59) > >> > ... 44 more > >> > Caused by: java.lang.reflect.InvocationTargetException > >> > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > >> > at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) > >> > at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) > >> > at java.lang.reflect.Method.invoke(Unknown Source) > >> > at com.google.apphosting.utils.clearcast.ClearCast$CasterImpl > >> > $ProxyHandler.invoke(ClearCast.java:411) > >> > ... 51 more > >> > Caused by: java.lang.NullPointerException > >> > at > >> > org.apache.openjpa.lib.util.MultiClassLoader.hashCode(MultiClassLoader.java: > >> > 277) > >> > at java.util.WeakHashMap.put(Unknown Source) > >> > at > >> > com.google.appengine.tools.development.agent.impl.AgentImpl.recordAppClassLoader(AgentImpl.java: > >> > 34) > >> > ... 56 more > >> > [WARN] > > ... > > Erfahren Sie mehr » -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. 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