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 <pjul...@gmail.com> 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 <roman.za...@gmail.com> 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] Nested in java.lang.ExceptionInInitializerError:
> > 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)
> > 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)
> >
>
> ...
>
> Erfahren Sie mehr »
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