Call by reference in weblogic

hi all,
i am using statful session ful bean ,where are i am using Vector ,when i retrieve
the vector in to another Vector and do some manipulation on the new Vector ,but
the Vector that is declared in the Stateful session bean remains unchanged , i
had using the same thing with the main site , and my local site ,it is working
on the localsite but not on the main site.
e.g Vector test = m_sessionfulBean.getAllValue();
when i do the changes it won't get reflected to the vector that it return.
Can somebody help?

The problem with the Vector (and almost all collections) is that while
they clone the main object, the elements are not cloned so any
modification to the elements will affect your original. That is why I
said that you should clone the collection only if the caller would not
modify the elements.
Or the EJB method can also clone the elements and return a new Vector.
The gain is performance since cloning is usually faster than serializing
for local clients but the down side of this is that remote clients will
have an overhead as for them the result will be serialized anyway so
there was a cloning done with no need for it.
Cheers,
Dejan
Byron Xiao wrote:
See, I am not sure what he really means in his message. By the way, Vector also
implements the Clonable interface. But the elements of the Vector may not implement
the Clonable interface. If you clone the Vector and return the cloned Vector
to the caller. There is no guarantee that the changes he made in the Vector elements
will get clone properly. So in that case, you aren't really seeing the true "call
by reference" behavior.
Basically, I don't understand what his question was. Sorry for the confusion.
"Deyan D. Bektchiev" <[email protected]> wrote:
Not really true, if the Vector is serialized then it would have to
serialize all of its elements and you'd get an exception that some
elements were not serializable.
The optimization that Sanjeev is seeing is a BEA optimization to allow
calls by reference within the same enterprise application (parameter
<enable-call-by-reference> in weblogic-ejb-jar.xml).
By default the value is true so calls within the same EAR are just
normal Java calls.
If you set it to false then the parameters and return value of the EJB
call will be serialized and the object that the EJB has will not be
affected by any change that the caller does to it.
Another way to get out of this situation is to clone the Vector (if that
is acceptable since it would not clone the elements the Vector contains).
--dejan
Byron Xiao wrote:
I don't know if I understand your problem 100%, but it seems like you
manipulated
the elements in your vector, which is a class member variable in your
stateful
session bean, and passing the vector back as the return parameter to
the caller
via the remote interface. And you don't see the changes in the "elements"
of
the vector, is that correct?
Well, remember all parameters and the return value of the remote calls
are Serializable.
In this case, Vector indeed is serializable. But the ELEMENTS inside
the vector
may not be serializable objects. In this case, the container will use
the default
serialization mechanism to serialize / deserialize the elements into
the persistent
store or through the RMI I/O stream, which is just using a bit-wise
dump of your
Vector and all its elements object references to the persistent store
or RMI I/O
stream.
So the solution is to declare all the objects in your Vector elements
to implement
the java.io.Serializable interface. If all the Objects in your vector
elements
only contain primitive data types, you don't need to do anything extra.
If some
objects in your vector elements contain other object types that don't
implement
the java.io.Serialiazable interface, then you will need to write your
own writeObject
and readObject method to serialize /de-serialize those objects. You
can look
up many tutorial on Sun's website on how to do this. Hope it helps.
"sanjeev" <[email protected]> wrote:
hi all,
i am using statful session ful bean ,where are i am using Vector ,when
i retrieve
the vector in to another Vector and do some manipulation on the new
Vector
,but
the Vector that is declared in the Stateful session bean remains unchanged
, i
had using the same thing with the main site , and my local site ,it
is
working
on the localsite but not on the main site.
e.g Vector test = m_sessionfulBean.getAllValue();
when i do the changes it won't get reflected to the vector that it
return.
Can somebody help?

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    Attachments:
    AsyncCallByRefExamples.zip ‏99 KB

    Hi jcase, 
    Thank you for bringing this issue to our attention. I have created a Corrective Action Request to notify R&D of the issue. Sincerely, 
    Julianne K
    Systems Engineer, Embedded Systems
    Certified LabVIEW Architect, Certified LabVIEW Embedded Systems Developer
    National Instruments

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    Hi,
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    PPC
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    Message Edited by Tarek316 on 06-04-2007 09:11 PM

    Hello,
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    http://digital.ni.com/public.nsf/websearch/FEE9D75A70FB8EBA86256A9D00498B8A?OpenDocument
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    Regards,
    Elizabeth S.
    Applications Engineer
    National Instruments

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