How can i create a connectionPool in BMP?

Question

How connectionPolling handled in BMP?Application server is websphere.

Answer 1

Simple - you don't need to as WebSphere already has one and the J2EE provides you with an API to use.
At WebSphere top-level create a DataSource to point to your database and give the data-source a name (eg. MyDataSource). You will have to specify a db driver (but WAS gives you options) and the db URL.
Then any code running in WAS can do this...
javax.naming.Context ctx = new InitialContext();
DataSource ds = (DataSource) ctx.lookup("jdbc/MyDataSource");
java.sql.Connection con = null;
try {
  con = ds.getConnection("usr", "pwd");
  java.sql.Statement stmt = con.createStatement();
  java.sql.ResultSet rs = stmt.executeQuery("SELECT * FROM my_table");
  while (rs.next()) {
    //etc
} catch (Exception e) {
  //handle
} finally {
  if (con != null) {
    try { con.close(); } catch (SQLException sql) { /* handle */ }
}In an BMP EJB, you can set the ds variable as an instance variable and initialize it in the setSessionContext() method, supplying the username and password in the EJB's environment properties