Datasource Connection Pooling - Per environment or per J2EE node?

Hi all,
I have a question about the JDBC service regarding the connection pooling.
For external datasources, we have specified a max. pool size of 25.
Now, is this value per J2EE server node per Dialog Instance, or is this a global setting?
In other words, say we have 5 dialog instances each with 4 server nodes, do we have pools with a total size of 200 maximum connections, or just 25?
Thanks in advance!
Robin van het Hof

Hi Dagfinn,
The below mentioned exception is thrown the most:
[code]
com.shell.gep.service.employee.jdbc.JDBCEmployeeServiceNew#sap.com/irj#com.shell.gep.service.employee.jdbc.JDBCEmployeeServiceNew#Niels.Dijksman#502#####Thread[PRT-Async 16,5,PRT-Async]##0#0#Fatal##Plain###Unable to execute query: /* com.shell.gep.service.employee.jdbc.JDBCEmployeeServiceNew */SELECT NVL(WWW, 'Y') FROM PROVISIONING.SHELLDETAILS WHERE SAMACCOUNTNAME = ?, cause: Closed Connection#
     at com.shell.gep.service.employee.jdbc.JDBCEmployeeServiceNew.doMasterQuery(JDBCEmployeeServiceNew.java:410)#
     at com.shell.gep.service.employee.jdbc.JDBCEmployeeServiceNew.internalGetProperty(JDBCEmployeeServiceNew.java:361)#
     at com.shell.gep.service.employee.jdbc.JDBCEmployeeServiceNew.getProperty(JDBCEmployeeServiceNew.java:66)#
     at com.shell.gep.service.employee.AggregatedEmployeeService.getProperty(AggregatedEmployeeService.java:153)#
     at com.shell.gep.service.employee.AggregatedEmployeeService.getProperty(AggregatedEmployeeService.java:153)#
     at com.shell.gep.service.employee.EmployeeServiceImpl.getProperty(EmployeeServiceImpl.java:116)#
     at com.shell.gep.news.iviews.dynpage.NewsDynPage.getMyExternal(NewsDynPage.java:143)#
     at com.shell.gep.news.iviews.dynpage.NewsDynPage.doProcessBeforeOutput(NewsDynPage.java:114)#
     at com.sapportals.htmlb.page.PageProcessor.handleRequest(PageProcessor.java:123)#
     at com.sapportals.portal.htmlb.page.PageProcessorComponent.doContent(PageProcessorComponent.java:134)#
     at com.sapportals.portal.prt.component.AbstractPortalComponent.serviceDeprecated(AbstractPortalComponent.java:209)#
     at com.sapportals.portal.prt.component.AbstractPortalComponent.service(AbstractPortalComponent.java:114)#
     at com.sapportals.portal.prt.core.PortalRequestManager.callPortalComponent(PortalRequestManager.java:328)#
     at com.sapportals.portal.prt.core.PortalRequestManager.dispatchRequest(PortalRequestManager.java:136)#
     at com.sapportals.portal.prt.core.async.AsyncIncludeRunnable$1$DoDispatchRequest.run(AsyncIncludeRunnable.java:377)#
     at java.security.AccessController.doPrivileged(Native Method)#
     at com.sapportals.portal.prt.core.async.AsyncIncludeRunnable.run(AsyncIncludeRunnable.java:390)#
     at com.sapportals.portal.prt.core.async.ThreadContextRunnable.run(ThreadContextRunnable.java:164)#
     at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:729)#
     at java.lang.Thread.run(Thread.java:534)#
java.sql.SQLException: Closed Connection#
     at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)#
     at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179)#
     at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:269)#
     at oracle.jdbc.driver.OracleConnection.privatePrepareStatement(OracleConnection.java:962)#
     at oracle.jdbc.driver.OracleConnection.prepareStatement(OracleConnection.java:869)#
[/code]
So it apears it's an Oracle problem rather than a SAP problem indeed

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    Andrew

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                   throw new SQLException("No database connection");
                } catch (NamingException e) {
                    e.printStackTrace();
                    throw new NoConnectionException(); 
             } catch (SQLException e) {
                 e.printStackTrace();
                    throw new NoConnectionException(); 
                catch (NullPointerException e) {
                 e.printStackTrace();
                    throw new NoConnectionException();  // obsluga bledy na wypadek jesli braknie wolnych polaczen do bazy
            return conn;
    }and at my ealier code i have error:
    at logic.GetDataOracle.getrep_dws_wnioski_wstrzymane_graph(GetDataOracle.java:192)
    at line: con = Database.createConnection();
    in code:
    public List getrep_dws_wnioski_wstrzymane_graph() {
        int i = 0;
        try {
        con = Database.createConnection();
        ps =    (Statement) con.createStatement();
        rs = ps.executeQuery("select data, klasa, ile_dni_wstrzymana, ile_wnioskow from stg1230.dwsww_wstrzymane_dws8 order by data, klasa, ile_dni_wstrzymana, ile_wnioskow");
        while(rs.next()){
          rep_dws_wnioski_wstrzymane_graph.add(i,new get_rep_dws_wnioski_wstrzymane_graph(rs.getString(1),rs.getString(2),rs.getString(3),rs.getString(4)));
          i++;
        } catch (NamingException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        } catch (NullPointerException e) {
            e.printStackTrace();
            throw new NoConnectionException();
        } finally {
        try {
            if(con != null)
            con.close();
        } catch (SQLException e) {
            e.printStackTrace();
        } catch (NullPointerException e) {
            e.printStackTrace();
            throw new NoConnectionException(); 
    return rep_dws_wnioski_wstrzymane_graph;
    }so what's wrong?
    i have limit max sessions 10 at oracle so i set at my connection pool 5 connections as max. But when i get max 5 sesssins and try to execute next query then i can't catch exception..

  • Repost-Best way of using connection pooling

    I am reposting this, seems best suitable in this category.
    I am using Eclipse 3.1 along with Tomcat 5.0, MySQL 4.1, J2EE1.4. I could set up the JNDI Dataresource connection pooling and tested with small test servlet. Now thinking of having common methods for getting connection / closing / commiting ....etc.
    I wrote following. [Please let me know whether it is correct way of doing it - as i am not very sure]
    package common;
    import java.sql.*;
    import javax.sql.*;
    import javax.naming.*;
    import org.apache.log4j.Logger;
    public final class connectionManager {
         private static Logger logger = Logger.getLogger(common.connectionManager.class);
         public connectionManager() {}
         public static Connection getConn () throws NamingException, SQLException
    //JNDI DataSource connection pooling
              Connection conn = null;
              try{
                   Context initContext = new InitialContext();
                   Context envContext  = (Context)initContext.lookup("java:/comp/env");
                   DataSource ds = (DataSource)envContext.lookup("jdbc/TQ3DB");
                   conn = ds.getConnection();
              }catch (NamingException ne) {
                  new GlobalExceptionHandler(logger, ne);
                   conn = null;
                   throw new NamingException();
              }catch (SQLException e){
                   new GlobalExceptionHandler(logger, e);
                   conn = null;
                   throw new SQLException();
              return conn;
           }//getConnection
         public static void commit(Connection conn) throws SQLException
              conn.commit();
         public static void rollback(Connection conn) throws SQLException
              conn.rollback();
           public static void setAutoCommit(Connection conn, boolean autoCommit)
                                        throws SQLException
                conn.setAutoCommit(autoCommit );
         public static void closeConnection(Connection conn) throws SQLException{
              if (conn != null) {
                   conn.close();
                   conn = null;
         }//closeConnection
         public static void closeResources(ResultSet oRS, PreparedStatement pstmt) throws SQLException
              if (oRS != null) {
                   oRS.close();
                   oRS = null;
              if (pstmt != null) {
                        pstmt.close();
                        pstmt = null;
         } // closeResources
    }//ConnectionManager
    I am having a login form which submits user name and password. I am checking this against the database. Following is the servlet to do that.
    package login;
    import java.io.*;
    import javax.servlet.*;
    import javax.servlet.http.*;
    import java.sql.*;
    import common.*;
    public class loginServlet extends HttpServlet {
         public void doGet(HttpServletRequest request, HttpServletResponse response)
                   throws ServletException, IOException {          
              doPost(request, response);
         }//doGet
         public void doPost(HttpServletRequest request, HttpServletResponse response)
                   throws ServletException,IOException{
              String userId = request.getParameter("userId");
              String password = request.getParameter("password");
              ** call a method to validate the password which will return the
              ** User Name for authorized users and null string for un-authorised.
              String uName = validateUser(userId, password);
              //if uName is null .. user is not authorized.
              if (uName == null){
                   //redirect to jsp page with error message
                  RequestDispatcher rd =
                       getServletContext().getRequestDispatcher("/jsps/mainmenu.jsp");
                  if (rd != null){
                       rd.forward(request,response);
              else{
                   // the user is valid - create a seesion for this user.
                   HttpSession userSession = request.getSession(true);
                   // put the user name session variable.
                   userSession.setAttribute("userName", uName);
                   //redirect to Main menu page
                   RequestDispatcher rd =
                        getServletContext().getRequestDispatcher("/jsps/mainmenu.jsp");
                   if (rd != null){
                        rd.forward(request,response);
         }// end of doPost
         private String validateUser(String userId, String password)
                   throws SQLException{
              String returnVal = null;
              connectionManager cm = new connectionManager();
              Connection conn = null;
              PreparedStatement pstmt = null;
              ResultSet oRS = null;
              try{
                   //get the connection
                   conn = cm.getConn ();
                   //get records from user table for this user id and password
                   String sQry = "SELECT  user_login FROM user "
                             + "where user_login = ? AND user_pwd = ? ";
                   pstmt = conn.prepareStatement(sQry);
                   pstmt.setString(1, userId);
                   pstmt.setString(2, password);
                   oRS = pstmt.executeQuery();
                   //check for record
                   if (oRS.next()) {
                        returnVal = oRS.getString("user_login");
                   }else {returnVal = null;}
                 }catch (Exception e){            
                      returnVal = null;
              }finally{
                   cm.closeResources(oRS, pstmt);
                   cm.closeConnection(conn);
              return returnVal;
    }// end of servlet class
    But i am unable to compile it and i am also getting lots of warnings.
    I am getting error at line
    1)String uName = validateUser(userId, password);
    Unhandled exception type SQLException loginServlet.java TQ3/WEB-INF/src/login line
    Following warnings:
    2)For loginServlet Declaration
    The serializable class DBTest does not declare a static final serialVersionUID field of type long loginServlet.java
    3)The static method getConn() from the type connectionManager should be accessed in a static way
    4)The static method closeResources(ResultSet, PreparedStatement) from the type connectionManager should be accessed in a static way
    5)The static method closeConnection(Connection) from the type connectionManager should be accessed in a static way
    Definitely I am doing it wrong but exactly where? I am having very strong doubt the way i am using connections is not the correct way. Pls help me.
    regards
    Manisha

    I am in a search of best way to use connection pooling. Initially was using simple JDBC call, then modified to JNDI, afterwards tried to have common class. Later came accross the idea of Singleton/Static. I wanted to have a common class which will handle all connection related issues and at the same time give good performance.
    With due respect to all Java Gurus: i got all from web articles/tutorials/java forum etc. There is a long discussion regarding Singlet vs static in this forum. But finally got confused and could not figure out in my case which method shall i make use of, so tried both.
    What I want is somebody pointing out flwas inside my 2 code snippets and guide me about which method shall i adopt in future.
    Static way:
    package common;
    import java.sql.Connection;
    import javax.sql.DataSource;
    import java.sql.SQLException;
    import javax.naming.InitialContext;
    import javax.naming.NamingException;
    public final class ConnectionManager_Static {
         private static InitialContext ctx = null;
         private static DataSource ds = null;
         public ConnectionManager_Static(){     }
         //as the staic method is updating static var i am synchonizing it
         private static synchronized void getDatasource () throws NamingException, SQLException
              if (ds == null){
                   ctx = new InitialContext();
                   ds = (DataSource)ctx.lookup("java:comp/env/jdbc/MySql");
         //making getConnection() also static as it is not instance specific     
         public static Connection getConnection () throws NamingException, SQLException, Exception
              Connection conn = null;
              try{     
                   if (ds == null) {getDatasource ();}
                   if (ds != null) {
                        conn = ds.getConnection();                 
              }catch (Exception e){
                   throw new Exception("From ConnectionManager_Static",e);
              return conn;
           }//getConnection
    }Singleton:
    package common;
    import java.sql.*;
    import javax.sql.*;
    import javax.naming.*;
    public final class ConnectionManager_Singleton {
             private static ConnectionManager_Singleton INSTANCE = null;
              private DataSource datasource = null;
              // Private constructor for singleton pattern
             private ConnectionManager_Singleton() throws NamingException{
                   Context ctx = new InitialContext();
                   datasource = (DataSource)ctx.lookup("java:comp/env/jdbc/MySql");
             //synchronized creator for  multi-threading issues
             //another if check to avoid multiple instantiation
             private synchronized static void createInstance() throws NamingException{
                 if (INSTANCE == null) {
                     INSTANCE = new ConnectionManager_Singleton();
             public static ConnectionManager_Singleton getInstance() throws NamingException {
                 if (INSTANCE == null) createInstance();
                 return INSTANCE;
              public Connection getConnection() throws Exception
                   Connection con = null;
                   try{
                        con = datasource.getConnection();
                   }catch(Exception e){
                        throw new Exception("From connection manager singleton ", e);
                   return con;
    }Sorry, It's becoming long.
    Thanaks in advance,
    Manisha

  • Problems using connection pooling

    I'm having problems configuring connection pooling in oc4j. Have specified my datasource/connection pool in my data-sources.xml. I always get the following error when I try to access it with an instance of OracleConnectionPoolDataSource within my apps. The app server dosen't seem to create the connections when started 'cos its not displayed within Oracle dba studio. Can anyone tell what I need to do pls.
    regards!
    dyzke
    //-- error displayed
    Exception in thread "main" java.sql.SQLException: Io exception: The Network Adap
    ter could not establish the connection
    at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:168)
    at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:210)
    at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:323)
    at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java:260)
    at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.ja
    va:365)
    at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:260)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java
    :111)
    // -- extract
    <data-source
              class="com.evermind.sql.DriverManagerDataSource"
    name="MYDS"
              location="jdbc/XXX"      
    xa-location="jdbc/xa/OracleXADS"
              ejb-location="jdbc/OracleDS"
    pooled-location="xxx/xxxx"
              max-connections="10"
              min-connections="3"                    
              connection-driver="oracle.jdbc.driver.OracleDriver"
              username="admin"
              password="admin"
              url="jdbc:oracle:thin:@localhost:xxx"
              inactivity-timeout="30"
         />

    see my answer in the other newsgroup.
    please don't cross post.
    "M. Hammer" <[email protected]> wrote in message
    news:[email protected]..
    Hi,
    We have problems using connection pooling in a WLS 5.1.x - Cluster. Is it
    possible to use CP in such a cluster at all ? The problem is, connections
    will be opened and never been closed. How can I configure a cluster forCP?
    >
    I have a WLS-Cluster with 2 instances and my webApp uses connectionpooling.
    By the way I get a connection on Instance 1, Instance 2 gets a connection
    also, but never releases it.
    In my opinion, the reference to the connection in the partner-instancewill
    be lost.
    How do I have to configure my cluster to work well with that stuff ?
    Thank a lot,
    Markus.

  • Establishing multiple WLEC connection pools

    Running WLS 6.0 communicating with WLE 4.2:
    I'm looking at setting up multiple connection pools to communicate with multiple
    WLE application domains.
    The code fragment below is from the BEA documentation and works fine if you know
    the domain(pool) name. My code uses the "lookup" method in the InitialContext
    class to get the pool name for single WLEC pool/domain configuration. Is there
    a method to return a list of domain(pool) names?
    Each WLEC connection pool has a Tobj_Bootstrap object that lets you access the
    associated WLE domain. The WLEC component provides an object called BootstrapFactory
    which provides access to the Tobj_Bootstrap object for a particular WLE domain.
    Include the following code in your WebLogic Server client to connect to a WLE
    domain:
    Tobj_Bootstrap myBootstrap = Tobj_BootstrapFactory.getClientContext("myPool");
    where
    The getClientContext() method returns the Tobj_Bootstrap object that is associated
    with myPool. If getClientContext() cannot find a WLEC connection pool with this
    name, it returns null.
    myPool is the name of a WLEC connection pool for the desired WLE domain. This
    WLEC connection pool needs to be defined in the Administration Console.

    Well ... It boiled down to ACLs.
    "Sreeram" <[email protected]> wrote:
    >
    Hi
    I have WLI application ( 7.0 ) and another J2EE appliction configured
    on WLS (
    7.0 ). If I have multiple jdbc connection pools configured to access
    different
    ( or even the same ) databases, I am unable to get the connection to
    execute a
    sql query in the J2EE app. The connection pool gets initialized properly
    during
    the server startup and I can see them in the console but when I try to
    acquire
    a connection from the pool for execution of a jdbc stmt, I am unable
    to obtain
    a connection. Did any one succeed in configuring mulitple jdbc connection
    pools
    and WLI and another J2EE app to run together on WLS 7.0? Any suggestions
    are welcome.
    Thanks
    Sreeram

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