Does anyone know about this !!!!!!

Question

hi all,
I am using Tomcat 4.0 and wanted to setup a database connection pool to a oracle database server. I am able to configure a datasource and get the connection using the web.xml (resource-ref) and server.xml (ResourceParam) tags.
My questions are
1. Does tomcat provide a connection pool impl. or is it left to the database driver provider to do that???
2. if i put a ejb-ref entry in the web.xml how can i specify the ResourceParam entries in the server.xml so that i can point to a weblogic or jboss app server running on a different machine.
regards,
venky

Answer 1

I am using Tomcat 4.0 and wanted to setup a database connection pool to a oracle database
server. I am able to configure a datasource and get the connection using the web.xml
(resource-ref) and server.xml (ResourceParam) tags.I never done that (using web.xml & server.xml to define the DB), however I'm used to work with oracle connection pool.
Here's an example (I'm using the latest JDBC drivers of Oracle available on the OTN) :
public static class DbConnectionPool {
  private static OracleConnectionCacheImpl myConnectionPool;
  private static OracleConnectionPoolDataSource myDataSource;
  public void initConnectionPool(){
    try{
      //Create & configure datasource
      myDataSource = new OracleConnectionPoolDataSource();
      myDataSource.setDriverType("thin");
      myDataSource.setNetworkProtocol("tcp");
      myDataSource.setServerName  ("hostname or ip address");
      myDataSource.setDatabaseName("oracle instance");
      myDataSource.setPortNumber  ("1521 is the installation default");
      myDataSource.setUser        ("scott");
      myDataSource.setPassword    ("tyger");
      //Create & configure pool
      myConnectionPool = new OracleConnectionCacheImpl(myDataSource);
      myConnectionPool.setMaxLimit(20);
      myConnectionPool.setMinLimit(2);
      myConnectionPool.setCacheScheme(OracleConnectionCacheImpl.DYNAMIC_SCHEME);
    }catch (Throwable ex){
      log.error("initConnectionPool() - Exception catched:",ex);
  public OracleConnection getDatabaseConnection(){
    try{
      return myConnectionPool.getConnection();
    }catch (Throwable ex){
      return null;
  public void closeDatabaseConnection(OracleConnection connection){
    try{
      connection.close();
    }catch (Throwable ex){
      log.error("getDatabaseConnection() - Exception catched: " , ex);
}Hope it will help,