Error when using OC4J Datasource

Question

Hi,
A customer is using a Servlet to run in an OC4j instance and is using EJB's for data DML.
To work around the possibility that XMLTypes are not supported we do an update in the DoPost.
public void ejbPostCreate(String mediumnummer, String inzender, String inhoud, PrlBerichttypeLocal prlBerichttypeLocal)
OracleConnection oconnection = null;
OraclePreparedStatement opstmt = null;
CLOB tempCLOB = null;
try
oconnection = (OracleConnection)getConnection();
String sql = "";
sql += "update prl_xml_berichten SET ";
sql += "INHOUD = XMLTYPE(?) where id = ?";
opstmt = (OraclePreparedStatement)oconnection.prepareCall(sql);
System.out.println(sql);
System.out.println("username : "+ oconnection.getMetaData().getUserName());
tempCLOB = CLOB.createTemporary(oconnection,true,CLOB.DURATION_SESSION);
Writer writer = tempCLOB.getCharacterOutputStream();
writer.write(inhoud);
writer.flush();
writer.close();
opstmt.setCLOB(1,tempCLOB);
opstmt.setLong(2,id.longValue());
boolean test = opstmt.execute();
tempCLOB.trim(0);
if (!test) System.out.println("Succes !!!!");
else System.out.println("Failure!!!");
// connection.commit();
catch (Exception exc)
System.out.println("Fout bij inhoud update ");
exc.printStackTrace();
finally
try
if (opstmt != null) opstmt.close();
if (oconnection != null) oconnection.close();
System.out.println("create dopost gedaan...");
catch (SQLException sqlex)
sqlex.getMessage();
System.out.println("Fout bij afsluiten dopost");
When they are using the getConnection from the Datasource:
private Connection getConnection() throws NamingException, SQLException
InitialContext context = new InitialContext();
DataSource dataSource = null;
// Look up data source object in directory service using JNDI
dataSource = (DataSource)context.lookup("jdbc/prlDS");
// Establishing db connection
return dataSource.getConnection();
The following error occurs:
username : PRL
create dopost gedaan...
com.evermind.server.rmi.OrionRemoteException: javax.ejb.EJBException: java.lang.AbstractMethodError: oracle.jdbc.OracleConnection oracle.jdbc.OracleConnection.unwrap()
java.rmi.RemoteException com.evermind.server.ejb.EJBUtils.getUserException(java.lang.Throwable, boolean) EJBUtils.java:263
java.lang.String CheckIn_StatelessSessionBeanWrapper8.checkInMessage(java.lang.String[]) CheckIn_StatelessSessionBeanWrapper8.java:126
When we change it to the connection setup with a hard string it does work:
private Connection getConnection() throws NamingException, SQLException
DriverManager.registerDriver(new OracleDriver());
return DriverManager.getConnection(Receiver.DATASOURCE);
Does anybody have an idea what the difference is with the direct connect string or the datasource from OC4J.
I attached the full error and the datasource.xml.
Regards,
Remco

Answer 1

Hi Remco,
You may not be aware of this, but the "Connection" returned from a "DataSource" is not necessarily the same as the one returned from "DriverManager". If I remember correctly, there was a similar question to yours posted to this forum, not so long ago. As I recall, Steve Button mentioned that there are emulated and non-emulated "Connection"s. I saw no mention in your post regarding which version of OC4J you are using, so I will assume the latest, stand-alone, production version (9.0.3). The Data Sources chapter of Oracle9iAS Containers for J2EE Services Guide has more details.
Good Luck,
Avi.