JDO object id problem when working with an appserver

Hi,
I'm running into a problem when passing a JDO object id as an argument to a
bean. My client is finding a JDO object locally, then attempting to
instantiate a bean which wraps the JDO object. Since the JDO object is not
Serializable, I'm passing the object id to the bean constructor, so that the
bean can look up the object again, this time in the appserver, and wrap it,
without ever serializing the object.
I'm guessing that the JDOId class for the JDO object is generated on the fly
in the client, and therefore does not exist in the ClassLoader in the
appserver. Any ideas how I can fix this?
Thanks,
Eric
Exception in thread "main" java.lang.reflect.UndeclaredThrowableException:
java.lang.ClassNotFoundException: test.TheTest$JDOId (no security manager:
RMI class loader disabled)
at
sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteC
all.java:245)
at
sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:220)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:122)
at
org.jboss.ejb.plugins.jrmp.server.JRMPContainerInvoker_Stub.invokeHome(Unkno
wn Source)
at
org.jboss.ejb.plugins.jrmp.interfaces.HomeProxy.invokeHome(HomeProxy.java:25
8)
at
org.jboss.ejb.plugins.jrmp.interfaces.HomeProxy.invoke(HomeProxy.java:182)
at $Proxy0.create(Unknown Source)
at test.TheTestRemote.<init>(Unknown Source)
at test.TheTest.getRemoteObject(TheTest.java:19)
at
com.hcm.tools.util.CollectionHelper.getFirst(CollectionHelper.java:23)
at
com.hcm.tools.jdo.JDOFactory.executeSingletonQuery(JDOFactory.java:234)
at test.Test.print(Test.java:22)
at test.Test.main(Test.java:11)

Hi David,
I'm trying to use JDO to completely replace Entity Beans. Of course, this
leaves me with an important question: how do you make the JDO object
available remotely? My answer is to wrap JDO objects with a stateful
session bean, and pass through method calls made on the bean to the JDO
object. Both the bean and the JDO object will implement some interface, so
you can use an object in a client without any knowledge as to whether it is
a bean or a JDO object. ( Important note: I can get away with this because
of another cool Solarmetric product, the session bean creator, which
enhances a simple java object into a session bean )
Now, once I have some interface implementation, maybe a local persistent
object, maybe a remote object, I will want to do something with it. There
are a couple considerations here. First, if I want to edit the object, I
need to make sure a transaction gets started. I do this by having my
session beans take care of starting and committing transactions. Since I
have written my own JDO Factory that takes care of synchronizing PM caches
across transactions, this has the effect of keeping all my caches in the
appserver up-to-date as well ( more on that if you're interested ). So, in
order to call a 'set' method, I need to ensure that the object I have is in
it's "remote" state, so-to-speak.
So I created an interface called RemotePersistentObject, which all these
other interfaces extend. It includes two methods, getRemoteObject (), and
getObjectId (). The reason for getObjectId (), instead of
getPersistentObject (), is that often times you don't want your JDO objects
to be Serializable, especially if you have JDO objects that you want to
guarantee remain unique ( say, no two Stock objects have the same ticker
symbol ). Besides, you want the remote object to represent the same
concept, and as soon as you serialize the persistent object, you have a copy
of the original JDO object that will no longer do nice things you'd like it
to do, like get updated when some transaction in a different thread modifies
a field.
So, to get around this serialization issue, I just pass the JDO object id to
the bean, and have the bean lookup and wrap the appropriate JDO object on
the server. I wrote a couple optional base classes that provide a lot of
the functionality for this, since it turns out that wrapping a
non-serializable JDO object is non-trivial. The problem there is that when
the bean passivates, it serializes the state of the session bean... oops.
So the base classes take care of keeping a transient reference to the actual
object, while keeping a non-transient ref to the object id. All attempts to
use the actual JDO object are filtered through a getObject () method, which,
if the transient ref has disappeared due to bean passivation, looks up the
object in a read-only PM again.
Hmmmm. Lots of stuff here. I'll stop here and answer any questions (
criticisms ) you may have.
-Eric
"David Ezzio" <[email protected]> wrote in message
news:[email protected]...
Eric,
Curious minds want to know: what are you up to here? I found this to
be a very interesting post, and I would like to know more about the
architecture you are using and its motivation if you can share it.
David Ezzio
Eric Lindauer wrote:
Hi,
I'm running into a problem when passing a JDO object id as an argument
to a
bean. My client is finding a JDO object locally, then attempting to
instantiate a bean which wraps the JDO object. Since the JDO object isnot
Serializable, I'm passing the object id to the bean constructor, so thatthe
bean can look up the object again, this time in the appserver, and wrapit,
without ever serializing the object.
I'm guessing that the JDOId class for the JDO object is generated on thefly
in the client, and therefore does not exist in the ClassLoader in the
appserver. Any ideas how I can fix this?
Thanks,
Eric
Exception in thread "main"java.lang.reflect.UndeclaredThrowableException:
java.lang.ClassNotFoundException: test.TheTest$JDOId (no securitymanager:
RMI class loader disabled)
at
sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteC
all.java:245)
at
sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:220)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:122)
at
org.jboss.ejb.plugins.jrmp.server.JRMPContainerInvoker_Stub.invokeHome(Unkno
wn Source)
at
org.jboss.ejb.plugins.jrmp.interfaces.HomeProxy.invokeHome(HomeProxy.java:25
8)
at
org.jboss.ejb.plugins.jrmp.interfaces.HomeProxy.invoke(HomeProxy.java:182)
at $Proxy0.create(Unknown Source)
at test.TheTestRemote.<init>(Unknown Source)
at test.TheTest.getRemoteObject(TheTest.java:19)
at
com.hcm.tools.util.CollectionHelper.getFirst(CollectionHelper.java:23)
at
com.hcm.tools.jdo.JDOFactory.executeSingletonQuery(JDOFactory.java:234)
at test.Test.print(Test.java:22)
at test.Test.main(Test.java:11)

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