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From "Jan Lendholt" <jlendh...@hotmail.com>
Subject Temporary objects
Date Tue, 14 Aug 2007 15:35:02 GMT
Hey Folks,

me again with yet another problem which in my opinion seems to me as a bag 
in cayenne.

Ok, the situation:

Create a dataset A, save (commit) and close the application. Then open the 
application and create a dataset B - do NOT save (commit) Changes and delete 
dataset A and dataset B.
Dataset A ist deleted by using context.deleteObject(objA) and dataset B ist 
deleted by unregisterObjects(temp) where temp is a collection withe objB in 
it.

Now on the commit of the changes we get an exception:

17:22:09.208 WARN!! Exception for /ams?serviceId=Echo.Synchronize
java.lang.NullPointerException: Attempt to add null target DataObject.
	at 
org.apache.cayenne.CayenneDataObject.addToManyTarget(CayenneDataObject.java:263)
	at 
org.apache.cayenne.access.ChildDiffLoader.arcCreated(ChildDiffLoader.java:111)
	at 
org.apache.cayenne.access.ObjectDiff$ArcOperation.apply(ObjectDiff.java:428)
	at org.apache.cayenne.graph.CompoundDiff.apply(CompoundDiff.java:97)
	at 
org.apache.cayenne.access.ObjectStoreGraphDiff.apply(ObjectStoreGraphDiff.java:136)
	at 
org.apache.cayenne.access.DataContext.onContextFlush(DataContext.java:1180)
	at org.apache.cayenne.access.DataContext.onSync(DataContext.java:1159)
	at 
org.apache.cayenne.access.DataContext.flushToParent(DataContext.java:1226)
	at 
org.apache.cayenne.access.DataContext.commitChanges(DataContext.java:1130)
	at 
ams.lieferanten.LieferantenCreateWindowPane.actionSave(LieferantenCreateWindowPane.java:280)
	at 
ams.lieferanten.LieferantenCreateWindowPane.access$4(LieferantenCreateWindowPane.java:236)
	at 
ams.lieferanten.LieferantenCreateWindowPane$7.actionPerformed(LieferantenCreateWindowPane.java:489)
	at 
nextapp.echo2.app.button.AbstractButton.fireActionPerformed(AbstractButton.java:135)
	at echopointng.ButtonEx$1.actionPerformed(ButtonEx.java:120)
	at 
nextapp.echo2.app.button.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:70)
	at 
echopointng.model.DefaultButtonModelEx.doAction(DefaultButtonModelEx.java:51)
	at echopointng.ButtonEx.processInput(ButtonEx.java:203)
	at 
nextapp.echo2.app.update.ClientUpdateManager.process(ClientUpdateManager.java:116)
	at 
nextapp.echo2.app.update.UpdateManager.processClientUpdates(UpdateManager.java:89)
	at 
nextapp.echo2.webcontainer.ContainerSynchronizeService.renderUpdate(ContainerSynchronizeService.java:472)
	at 
nextapp.echo2.webrender.service.SynchronizeService.service(SynchronizeService.java:279)
	at 
nextapp.echo2.webrender.WebRenderServlet.process(WebRenderServlet.java:273)
	at 
nextapp.echo2.webrender.WebRenderServlet.doPost(WebRenderServlet.java:189)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:356)
	at 
org.mortbay.jetty.servlet.WebApplicationHandler$Chain.doFilter(WebApplicationHandler.java:342)
	at 
org.apache.cayenne.conf.WebApplicationContextFilter.doFilter(WebApplicationContextFilter.java:91)
	at 
org.mortbay.jetty.servlet.WebApplicationHandler$Chain.doFilter(WebApplicationHandler.java:334)
	at 
org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:286)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:567)
	at org.mortbay.http.HttpContext.handle(HttpContext.java:1776)
	at 
org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:514)
	at org.mortbay.http.HttpContext.handle(HttpContext.java:1726)
	at org.mortbay.http.HttpServer.service(HttpServer.java:879)
	at org.mortbay.http.HttpConnection.service(HttpConnection.java:790)
	at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:952)
	at org.mortbay.http.HttpConnection.handle(HttpConnection.java:807)
	at 
org.mortbay.http.SocketListener.handleConnection(SocketListener.java:196)
	at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:289)
	at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:487)



I tried to track it back and found out, that on unregisterObjects the 
objects are being thrown out of the objectStore. Therefore we get a Null 
value when searching for the object on commit.
Now we tried the "deleteObject" method to delete the objB which has the 
state NEW. Neither dataset (objA, objB) is deleted. I am wondering why.

We are just holding some objects temporarily in the samte context with 
alread saved data in the database.

Is it a bug?

Thanks in advance!


Jan

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