Class cast exception for WLConnection

Question

Environment WLS 8.1 sp4, Oracle 9i, Solaris 9
I have a need to access the underlying physical db connection so we are using the getVendorConnection() method. On an intermittant basis the connection returned from the connection pool is not an instance of WLConnection so our cast fails.
java.sql.Connection vendorConn =((WLConnection)conn).getVendorConnection();
I believe the true type is weblogic.rmi.SerialConnection.
Is this a known problem? Are their potential workarounds(hopefully through configuration of the connection pool or datasource).
Thanks,
Glen

Answer 1

Glen Wilcox wrote:
Environment WLS 8.1 sp4, Oracle 9i, Solaris 9
I have a need to access the underlying physical db connection so we are using the getVendorConnection() method. On an intermittant basis the connection returned from the connection pool is not an instance of WLConnection so our cast fails.
java.sql.Connection vendorConn =((WLConnection)conn).getVendorConnection();
I believe the true type is weblogic.rmi.SerialConnection.
Is this a known problem? Are their potential workarounds(hopefully through configuration of the connection pool or datasource).
Thanks,
GlenHi Glen. This will occur if the code that is doing the cast is not in the same JVM as the
WLS server that has the connection. A client JVM can't ever get a direct reference to
a real DBMS JDBC connection that exists only in the server JVM where it was created. RMI
connections are proxies that act as go-betweens from the client to the remote/real
connection and back. The only fix is to run your code in a server, and always have your
pools deployed to the server.
Joe