Hi Jason,
Our schema looks as follows:
ProductType 1--------->M Product 1-------->M Release
Data is inserting into Release table. But while fetching data from
release table i am getting following exception:
Field com.ensarm.server.domain.Release.products should be able to
provide a reference to its parent but the entity does not have a
parent. Did you perhaps try to establish an instance of
com.ensarm.server.domain.Release as the child of an instance of
com.ensarm.server.domain.Products after the child had already been
persisted?
org.datanucleus.exceptions.NucleusUserException: Field
com.ensarm.server.domain.Release.products should be able to provide a
reference to its parent but the entity does not have a parent. Did
you perhaps try to establish an instance of
com.ensarm.server.domain.Release as the child of an instance of
com.ensarm.server.domain.Products after the child had already been
persisted?
at
org.datanucleus.store.appengine.DatastoreRelationFieldManager.lookupParent
(DatastoreRelationFieldManager.java:302)
at
org.datanucleus.store.appengine.DatastoreRelationFieldManager.fetchRelationField
(DatastoreRelationFieldManager.java:289)
at
org.datanucleus.store.appengine.DatastoreFieldManager.fetchObjectField
(DatastoreFieldManager.java:271)
at org.datanucleus.state.AbstractStateManager.replacingObjectField
(AbstractStateManager.java:1197)
at com.ensarm.server.domain.Release.jdoReplaceField(Release.java)
at com.ensarm.server.domain.Release.jdoReplaceFields(Release.java)
at org.datanucleus.state.JDOStateManagerImpl.replaceFields
(JDOStateManagerImpl.java:2772)
at org.datanucleus.state.JDOStateManagerImpl.replaceFields
(JDOStateManagerImpl.java:2791)
at
org.datanucleus.store.appengine.DatastorePersistenceHandler.fetchObject
(DatastorePersistenceHandler.java:349)
at org.datanucleus.store.appengine.query.DatastoreQuery.entityToPojo
(DatastoreQuery.java:384)
at org.datanucleus.store.appengine.query.DatastoreQuery.entityToPojo
(DatastoreQuery.java:345)
at org.datanucleus.store.appengine.query.DatastoreQuery.access$700
(DatastoreQuery.java:96)
at org.datanucleus.store.appengine.query.DatastoreQuery$5.apply
(DatastoreQuery.java:454)
at org.datanucleus.store.appengine.query.DatastoreQuery$5.apply
(DatastoreQuery.java:453)
at
org.datanucleus.store.appengine.query.StreamingQueryResult.resolveNext
(StreamingQueryResult.java:137)
at org.datanucleus.store.appengine.query.StreamingQueryResult
$1.computeNext(StreamingQueryResult.java:163)
at
org.datanucleus.store.appengine.query.AbstractIterator.tryToComputeNext
(AbstractIterator.java:132)
at org.datanucleus.store.appengine.query.AbstractIterator.hasNext
(AbstractIterator.java:127)
at org.datanucleus.store.appengine.query.StreamingQueryResult
$AbstractListIterator.hasNext(StreamingQueryResult.java:229)
at com.ensarm.server.servlet.GetData.getRelease(GetData.java:87)
at com.ensarm.server.servlet.GetData.doGet(GetData.java:32)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:693)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
487)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1093)
at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter
(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
at com.google.appengine.tools.development.StaticFileFilter.doFilter
(StaticFileFilter.java:124)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
at org.mortbay.jetty.servlet.ServletHandler.handle
(ServletHandler.java:360)
at org.mortbay.jetty.security.SecurityHandler.handle
(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle
(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle
(ContextHandler.java:712)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
405)
at com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle
(DevAppEngineWebAppContext.java:54)
at org.mortbay.jetty.handler.HandlerWrapper.handle
(HandlerWrapper.java:139)
at com.google.appengine.tools.development.JettyContainerService
$ApiProxyHandler.handle(JettyContainerService.java:313)
at org.mortbay.jetty.handler.HandlerWrapper.handle
(HandlerWrapper.java:139)
at org.mortbay.jetty.Server.handle(Server.java:313)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
506)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete
(HttpConnection.java:830)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
at org.mortbay.io.nio.SelectChannelEndPoint.run
(SelectChannelEndPoint.java:396)
at org.mortbay.thread.BoundedThreadPool$PoolThread.run
(BoundedThreadPool.java:442)
What should be done for this problem?
Anita
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