NameNotFoundException when access DB2 connection pool in BM

[koonkay]

When i access the DB2 connection pool in BMP, it prompt me
"javax.naming.NameNotFoundException: jdbc not bound"
my jboss.jcml config is

COM.ibm.db2.jdbc.app.DB2Driver



org.jboss.pool.jdbc.xa.wrapper.XADataSourceImpl<!-- [JBoss 2.4] -->
DB2DS
jdbc:db2:dev
gdb
password
jdbc/DB2DS


My client program is

try {
InitialContext initCtx = new InitialContext();
System.out.println("got context");

javax.sql.DataSource ds = (javax.sql.DataSource) initCtx.lookup("java:comp/env/jdbc/DB2DS");
System.out.println("got datasource");

initCtx.close();
//return ds.getConnection();

connection= ds.getConnection();

} catch (Exception e) {
System.out.println("error in getDBConnection :="+e);
}