In JDO, there are pm.detachX() methods you can use to do this. In JPA, it appears detachment is automatically done via an annotation, but the detached objects will still contain non-serializable stuff. Details here:
http://timepedia.blogspot.com/2009/04/google-appengine-and-gwt-now-marriage.html HTH, /dmc On Tue, Nov 9, 2010 at 7:59 AM, dparish <dpar...@gmail.com> wrote: > Thanks David. > > I tried LAZY and EAGER. Both caused the problem. > > For #2, that seems promising. There's an EntityManager clear method, > but that would affect all threads using the entity manager. Any > thoughts on how to do that detach? > > On Nov 8, 8:20 pm, David Chandler <drfibona...@google.com> wrote: >> Hi dparish, >> >> There are three issues here: >> >> 1. GWT needs a fully populated object graph to send back to the >> client. Lazy fetching will not work across the client / server >> boundary, so you must ensure that your code fetches all relations >> eagerly (via an annotation or a separate call if needed). >> >> 2. JDO and JPA implementations use proxy classes for objects attached >> to a persistence manager. Before they can be sent back to the client, >> you must detach all objects from the PM. >> >> 3. Even then, GWT won't be able to serialize any types for which it >> doesn't know the source (like App Engine's Key class). The open source >> Gilead project and others like Objectify provide GWT wrappers for >> these. >> >> HTH, >> /dmc >> >> >> >> >> >> >> >> >> >> On Mon, Nov 8, 2010 at 8:17 PM, dparish <dpar...@gmail.com> wrote: >> > I have an entity with a member like this: >> >> > @Entity >> > public class Foo implements Serializable{ >> >> > �...@onetomany(mappedBy="foo",targetEntity=InternalText.class, >> > fetch=FetchType.EAGER) // I tried Lazy too. >> >> > private ArrayList<InternalText>internalTextEntries; >> >> > When I try to use Foo I get this error: >> >> > Throwable occurred: >> > com.google.gwt.user.client.rpc.SerializationException: Type >> > 'org.apache.openjpa.util.java$util$ArrayList$proxy' was not included >> > in the set of types which can be serialized by this >> > SerializationPolicy or its Class object could not be loaded. For >> > security purposes, this type will not be serialized.: instance = >> > [blah.blah.entities.internalt...@36ae36ae, >> > blah.bhla.entities.internalt...@3fca3fca, >> > blah.blah.retain.entities.internalt...@42474247, >> > blah.blah.entities.internalt...@48724872] >> > at >> > com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali >> > ze(ServerSerializationStreamWriter.java: >> > 610) >> > at >> > com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.write >> > Object(AbstractSerializationStreamWriter.java: >> > 129) >> > at >> > com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter >> > $ValueWriter$8.write(ServerSerializationStreamWriter.java:152) >> > at >> > com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali >> > zeValue(ServerSerializationStreamWriter.java: >> > 534) >> > at >> > com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.seriali >> > zeClass(ServerSerializationStreamWriter.java: >> > 700) >> >> > From what I can tell openjpa is creating a helper representation of >> > ArrayList that it uses to assist in monitoring and lazy loading the >> > child table. I've tried eager and lazy fetching. >> >> > I tried this: >> >> > ArrayList<InternalText> newText = new ArrayList<InternalText>(); >> > for (InternalText textItem: foo.getInternalTextEntries()) { >> > newText.add(textItem); >> > } >> > foo.setInternalTextEntries(newText); >> >> > It got past my error, but then the next layer down had trouble (Date >> > in the InternalText class) >> >> > Type 'org.apache.openjpa.util.java$util$Date$proxy' was not included >> > in the set of types which can be serialized by this >> > SerializationPolicy >> >> > -- >> > You received this message because you are subscribed to the Google Groups >> > "Google Web Toolkit" group. >> > To post to this group, send email to google-web-tool...@googlegroups.com. >> > To unsubscribe from this group, send email to >> > google-web-toolkit+unsubscr...@googlegroups.com. >> > For more options, visit this group >> > athttp://groups.google.com/group/google-web-toolkit?hl=en. >> >> -- >> David Chandler >> Developer Programs Engineer, Google Web >> Toolkithttp://googlewebtoolkit.blogspot.com/ > > -- > You received this message because you are subscribed to the Google Groups > "Google Web Toolkit" group. > To post to this group, send email to google-web-tool...@googlegroups.com. > To unsubscribe from this group, send email to > google-web-toolkit+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/google-web-toolkit?hl=en. > > -- David Chandler Developer Programs Engineer, Google Web Toolkit http://googlewebtoolkit.blogspot.com/ -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. 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