Who can explain how EJB connect to Oracle9i DB with DataSource?

Question

I have taken 4 days into this problem. I am developing EJB with J2EE1.3 and Oracle9i DB, I can connect to DB in code with DriverManager. But I want to use DataSource to connect to DB. I failed, I can not get new way to resolve it when I after try to connect with javax.sql.DataSource, oracle.jdbc.pool.OracleDataSource and oracle.jdbc.pool.OracleConnectionPoolDataSource.
I have got different Exceptions when I coding different ways:
one is:
Caught an exception.
java.rmi.ServerException: RemoteException occurred in server thread; nested exce
ption is:
java.rmi.RemoteException: nested exception is: javax.ejb.EJBException: U
nable to connect to database. com.sun.enterprise.resource.JdbcDataSource; nested
exception is:
javax.ejb.EJBException: Unable to connect to database. com.sun.enterpris
e.resource.JdbcDataSource
java.rmi.RemoteException: nested exception is: javax.ejb.EJBException: Unable to
connect to database. com.sun.enterprise.resource.JdbcDataSource; nested excepti
on is:
javax.ejb.EJBException: Unable to connect to database. com.sun.enterpris
e.resource.JdbcDataSource
javax.ejb.EJBException: Unable to connect to database. com.sun.enterprise.resour
ce.JdbcDataSource
<<no stack trace available>>
the Other is:
Caught an exception.
java.rmi.ServerException: RemoteException occurred in server thread; nested exce
ption is:
java.rmi.RemoteException: nested exception is: javax.ejb.EJBException: U
nable to connect to database. makeConnection:Io Exception: Connection refused(DESCRIP
TION=(TMP=)(VSNNUM=150999297)(ERR=12505)(ERROR_STACK=(ERROR=(CODE=12505)(EMFI=4)
))); nested exception is:
javax.ejb.EJBException: Unable to connect to database. makeConnection:Io
Exception: Connection refused(DESCRIPTION=(TMP=)(VSNNUM=150999297)(ERR=12505)(ERROR_
STACK=(ERROR=(CODE=12505)(EMFI=4))))
java.rmi.RemoteException: nested exception is: javax.ejb.EJBException: Unable to
connect to database. makeConnection:Io Exception: Connection refused(DESCRIPTION=(TM
P=)(VSNNUM=150999297)(ERR=12505)(ERROR_STACK=(ERROR=(CODE=12505)(EMFI=4)))); nes
ted exception is:
javax.ejb.EJBException: Unable to connect to database. makeConnection:Io
Exception: Connection refused(DESCRIPTION=(TMP=)(VSNNUM=150999297)(ERR=12505)(ERROR_
STACK=(ERROR=(CODE=12505)(EMFI=4))))
javax.ejb.EJBException: Unable to connect to database. makeConnection:Io Exception: C
onnection refused(DESCRIPTION=(TMP=)(VSNNUM=150999297)(ERR=12505)(ERROR_STACK=(E
RROR=(CODE=12505)(EMFI=4))))
<<no stack trace available>>
My codes related are:
private void makeConnection() throws NamingException, SQLException {
try{
InitialContext ic = new InitialContext();
OracleConnectionPoolDataSource ocpds = (OracleConnectionPoolDataSource) ic.lookup(dbName);
PooledConnection pc = ocpds.getPooledConnection();
con = pc.getConnection();
}catch(SQLException ex){
throw new SQLException("makeConnection:" + ex.getMessage());
DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
con = DriverManager.getConnection(
"jdbc:oracle:thin:@172.28.200.43:1521:shcd",
"lijun", "xiaotian"); */
public void setEntityContext(EntityContext context) {
this.context = context;
try {
makeConnection();
} catch (Exception ex) {
throw new EJBException("Unable to connect to database. " +
ex.getMessage());
I believe I set JNDI and config EJB right, because I can run it with Cloudscape DB all right.
who can tell me where is my WRONG, or tell me how to connect to Oracle9i DB?

Answer 1

Hi Jhlijun,
I am facing the same problem at the moment. However, I am not using a pooled connection. The following is my code. I am trying to connect a stateless session bean to an Oracle 9i database with result being fed back to a jsp page.
package Test;
import javax.naming.*;
import java.sql.*;
import java.util.*;
import javax.ejb.*;
import javax.sql.DataSource;
import javax.sql.*;
public class TestSessionEJBbean extends java.lang.Object implements javax.ejb.SessionBean
String q="Select NAMETITLE,NAMEFIRST,NAMELAST from People where PeopleRSN<100";
     protected boolean create() throws java.lang.Exception
return true;
public TestSessionEJBbean()
{   // EJB constructors don't have a server context.
private void unhandledEvent( String listenerName, String methodName, java.lang.Object event )
// method for interface javax.ejb.SessionBean
public void ejbActivate() throws javax.ejb.EJBException, java.rmi.RemoteException
// To Do
// method for interface javax.ejb.SessionBean
public void ejbPassivate() throws javax.ejb.EJBException, java.rmi.RemoteException
// To Do
// method for interface javax.ejb.SessionBean
public void ejbRemove() throws javax.ejb.EJBException, java.rmi.RemoteException
// To Do
// method for interface javax.ejb.SessionBean
public void setSessionContext( javax.ejb.SessionContext parm0 ) throws javax.ejb.EJBException, java.rmi.RemoteException
this._sessionContext = parm0;          // generated helper code
// To Do
* Test Method
public String Test() throws javax.ejb.EJBException
return "Hi! I am the SessionEjbBean.";
* Session Context of this EJB.
* Set in 'setSessionContext()' before any 'ejbCreate()' is executed.
private javax.ejb.SessionContext _sessionContext;
* ejbCreate Method
public void ejbCreate() throws javax.ejb.EJBException, javax.ejb.CreateException
try {
create(); // This 'create()' is used for internal initialization.
catch( java.lang.Exception __e) {
System.err.println( __e.toString() + " " + __e.getMessage() );
// TODO: implement
* getDBConnection Method
     public sun.jdbc.rowset.CachedRowSet getDBConnection() throws javax.ejb.EJBException
     String testPrint = "Starting...";//Only to check output
     Connection conn;
     sun.jdbc.rowset.CachedRowSet crset=null;
     try {
          testPrint += "before new InitialContext()....";//Only to check output
          InitialContext ic = new InitialContext();
          DataSource ds = (DataSource)ic.lookup("java:comp/env/jdbc/coquit");
          testPrint += "before ds.getConnection()....";//Only to check output
          conn = ds.getConnection("coquit","coquit");          
               testPrint += "before conn.createStatement()....";
               Statement stmt=conn.createStatement();
               testPrint += "before stmt.executeQuery(....)";
               ResultSet rset = stmt.executeQuery(q);
               testPrint += "before new sun.jdbc.rowset.CachedRowSet()";     
               crset = new sun.jdbc.rowset.CachedRowSet();
               testPrint += "before crset.populate(rset)";
               crset.populate(rset);
               rset.close();
               stmt.close();
               conn.close();
     } catch (NamingException ne) {
     System.out.println("TestSessionEJBbean::getDBConnection Naming Exception " + ne);
     }catch (Exception e){
     System.out.println(testPrint+"...TestSessionEJBbean::getDBConnectionException" + e);
     System.out.println("\n\n");
     e.printStackTrace();
     return crset;