Upgraded to V4 R5 java errors now@!

We just recently upgraded from V4 R4 to V4 R5 our java code worked fine now we 
get the following error: Any help greatly appreciated TIA. JDK1.2

 Loading class com/ibm/db2/jdbc/app/DB2Warning.class from 
/QIBM/ProdData/Java400/ext/db2_classes.jar                             
com.ibm.db2.jdbc.app.DB2SQLException2: MSG_ERROR_CALL_STMT_STMT_NOT_REGISTERED  
                                                
      java/lang/Throwable.<init>(Ljava/lang/String;)V+4 (Throwable.java:94)     
                                                
      java/sql/SQLException.<init>(Ljava/lang/String;Ljava/lang/String;I)V+1 
(SQLException.java:43)                             
      
com/ibm/db2/jdbc/app/DB2SQLException2.<init>(Ljava/lang/String;Ljava/lang/String;I[B)V+1
 (DB2SQLException2.java:281)      
      com/ibm/db2/jdbc/app/DB2PreparedStatementRuntimeImpl.execute(II)I+40 
(DB2PreparedStatementRuntimeImpl.java:387)           
      com/ibm/db2/jdbc/app/DB2PreparedStatement.execute()Z+28 
(DB2PreparedStatement.java:1343)                                  
      com/csc/hcg/framework/SessionImpl.<init>(AuthorizationManager;)V+322 
(SessionImpl.java:171)        
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