Error While reading CLOB from Oracle using WebLogic Connection Pool, Works fine with out using pool

PROBLEM DESCRIPTION :
     When I try to read a clob from Oracle, I receive "ORA-03120: two-task
conversion routine: integer overflow" Error.
     This error occurs only for CLOB Type and only if I try to connect to
Oracle using WebLogic JDriver/Oracle POOL.
     IMPORTANT NOTE: I can read CLOB or any other data using direct JDBC
connection to ORacle with out any problem.
     Below Please find the JAVA CODE for Both Working and NON Working .
Created a Connection Pool as:
Name: MyJDBCConnectionPool
URL : jdbc:weblogic:oracle
DIRVER:weblogic.jdbc.oci.Driver
NON WORKING JAVA CODE (USES WEBLOGIC JDBC CONNECTION POOL TO ORACLE):
Driver myDriver =
(Driver)Class.forName("weblogic.jdbc.pool.Driver").newInstance();
Connection mconn =
myDriver.connect("jdbc:weblogic:pool:MyJDBCConnectionPool",null);
mconn.setAutoCommit (false);
CallableStatement cs = mconn.prepareCall("{call
P_XMLTEST2(?)}"); //This returns a CLOB
cs.registerOutParameter(1,java.sql.Types.CLOB);
cs.execute();
Clob clob = null;
clob = cs.getClob(1);
String data =new String();
data = clob.getSubString(1, (int)clob.length());
System.out.println(data); //print the data
data = null;
clob=null;
cs.close();
WORKING JAVA CODE (USES DIRECT THIN JDBC CONNECTION TO ORACLE):
Driver myDriver =
(Driver)Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
Connection mconn =
myDriver.connect("jdbc:oracle:thin:@server:1521:DB",null);
mconn.setAutoCommit (false);
CallableStatement cs = mconn.prepareCall("{call
P_XMLTEST2(?)}"); //This returns a CLOB
cs.registerOutParameter(1,java.sql.Types.CLOB);
cs.execute();
Clob clob = null;
clob = cs.getClob(1);
String data =new String();
data = clob.getSubString(1, (int)clob.length());
System.out.println(data); //print the data
data = null;
clob=null;
cs.close();
ERROR MESSAGE:
     ORA-03120: two-task conversion routine: integer overflow
I appreciate your help on this problem.

PROBLEM DESCRIPTION :
     When I try to read a clob from Oracle, I receive "ORA-03120: two-task
conversion routine: integer overflow" Error.
     This error occurs only for CLOB Type and only if I try to connect to
Oracle using WebLogic JDriver/Oracle POOL.
     IMPORTANT NOTE: I can read CLOB or any other data using direct JDBC
connection to ORacle with out any problem.
     Below Please find the JAVA CODE for Both Working and NON Working .
Created a Connection Pool as:
Name: MyJDBCConnectionPool
URL : jdbc:weblogic:oracle
DIRVER:weblogic.jdbc.oci.Driver
NON WORKING JAVA CODE (USES WEBLOGIC JDBC CONNECTION POOL TO ORACLE):
Driver myDriver =
(Driver)Class.forName("weblogic.jdbc.pool.Driver").newInstance();
Connection mconn =
myDriver.connect("jdbc:weblogic:pool:MyJDBCConnectionPool",null);
mconn.setAutoCommit (false);
CallableStatement cs = mconn.prepareCall("{call
P_XMLTEST2(?)}"); //This returns a CLOB
cs.registerOutParameter(1,java.sql.Types.CLOB);
cs.execute();
Clob clob = null;
clob = cs.getClob(1);
String data =new String();
data = clob.getSubString(1, (int)clob.length());
System.out.println(data); //print the data
data = null;
clob=null;
cs.close();
WORKING JAVA CODE (USES DIRECT THIN JDBC CONNECTION TO ORACLE):
Driver myDriver =
(Driver)Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
Connection mconn =
myDriver.connect("jdbc:oracle:thin:@server:1521:DB",null);
mconn.setAutoCommit (false);
CallableStatement cs = mconn.prepareCall("{call
P_XMLTEST2(?)}"); //This returns a CLOB
cs.registerOutParameter(1,java.sql.Types.CLOB);
cs.execute();
Clob clob = null;
clob = cs.getClob(1);
String data =new String();
data = clob.getSubString(1, (int)clob.length());
System.out.println(data); //print the data
data = null;
clob=null;
cs.close();
ERROR MESSAGE:
     ORA-03120: two-task conversion routine: integer overflow
I appreciate your help on this problem.

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            } catch (ClassNotFoundException ex) {
                Logger.getLogger(Storingobject.class.getName()).log(Level.SEVERE, null, ex);
        public static void main(String args[])
            Storingobject o1=new Storingobject();
            o1.x=10;o1.y=15;
            o1.addObject();
            o1.readobject();
    }

    //if i pass true as parameter in FileOutputStream it gives Stream Corrupted exceptionI agree. You can't append to a file written with an ObjectOutputStream. You would have to read it all in, write it all out again and write the new object. You're better off keeping the file open while you still have objects to write to it.
    while ((temp = (Storingobject) objIn.readObject()) != null) {ObjectInputStream.readObject() only returns null if you wrote a null. If you're not writing nulls, the correct technique is to loop until you get an EOFException. I don't favour explicitly writing a null just to get around this as suggested above, as it means you can never write a null for any other purpose.

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