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SQL ResultSet NotSerializableException

pjroy
pjroy asked
on
Medium Priority
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Last Modified: 2008-02-26
I got this exception while trying to pass a ResultSet object by rmi. My version of JDK is 1.0.2 and I have the last rmi version for JDK 1.0.2.

This is the execption -->

rmiClient exception: Error unmarshaling return; nested exception is:
        java.io.WriteAbortedException: Writing aborted by exception; java.io.Not
SerializableException: sun.jdbc.odbc.JdbcOdbcResultSet
java.rmi.UnmarshalException: Error unmarshaling return; nested exception is:
        java.io.WriteAbortedException: Writing aborted by exception; java.io.Not
SerializableException: sun.jdbc.odbc.JdbcOdbcResultSet
        at domtar.server.rmiServer_Stub.getResultSet(rmiServer_Stub.java:65)
        at domtar.client.rmiClient.getResultSet(rmiClient.java:57)
        at Client.executeQuery(Client.java:258)
        at Client.start(Client.java:247)
        at sun.applet.AppletPanel.run(AppletPanel.java:271)
        at java.lang.Thread.run(Thread.java:294)
java.lang.NullPointerException
        at Client.fillGridSecteur(Client.java:309)
        at Client.executeQuery(Client.java:260)
        at Client.start(Client.java:247)
        at sun.applet.AppletPanel.run(AppletPanel.java:271)
        at java.lang.Thread.run(Thread.java:294)
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Commented:
I believe that the ResultSet object keeps an open cursor to the database.  It does not load in the complete contents of the query, and therefore, can not be serialized (all the data is not available).  

As a work around, try loading all the data into a common data structure (an array or vector).

Commented:
I believe that the ResultSet object keeps an open cursor to the database.  It does not load in the complete contents of the query, and therefore, can not be serialized (all the data is not available).  

As a work around, try loading all the data into a common data structure (an array or vector).
For what its worth, marshaling is the proces by which the client and server guarantee that data is being transfered in a safe and compatible manner.

An unmarhaling exeption is usualy cast when when you have IDL level incompatibilities between the client and the server. (integer size for exaple).

In DB oriented apps, it can also be cast when you bind local variables to SQL columns that do not match. (Java 2-byte chars to SQL 1 byte chars for instance.)

Now if the error is actualy related to the serialization process (and is not appearing as a side effect of an IDL definition error). Than Java is trying to serialize a value of one data type but actualy obtaining a value of another.

Hope this helps to gain an insight into the problem.
Commented:
Well, the class ResultSet doesn't implement the interface
Serializable.  Therefore you can't pass it thru RMI.

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Commented:
Since the Resultset is not serialiazable, it looses it's state while been transfered from server to client. So, put the values from resultset to a vector since u don't know the size of the resultset , vector is recomended, and send.
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