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.

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When I checked the tomcat server in netbeans it says a version of tomcat 5.5.9(May be netbean's tomcat).So is there anything to be changed for server.xml of higher version tomcat above 5.0?
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Hi everyone,
I use Apache Tomcat server 5.0 and Mysql as back end. I have done connection pooling in tomcat server installation folder and everything works fine.But when I tried the same on netbeans I could not connect using connection pooling and it's throwing error as
'Name jdbc is not bound in this Context'.
When I checked the tomcat server in netbeans it says a version of tomcat 5.5.9(May be netbean's tomcat).So is there anything to be changed for server.xml of higher version tomcat above 5.0?
I need your help to solve this issue.
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Using Connection Pooling in a WLS 5.1.x - Cluster

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 for CP?
          I have a WLS-Cluster with 2 instances and my webApp uses connection pooling.
          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-instance will
          be lost.
          How do I have to configure my cluster to work well with that stuff ?
          Thank a lot,
          Markus.


Clustering with connection pools works fine in WLS 5.1. If connections are
          not being release, you have bugs in your code.
          When a connection is retrieved from a pool on one instance, a corresponding
          connection is NOT retrieved on another instance.
          Mike
          "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 for
          CP?
          >
          > I have a WLS-Cluster with 2 instances and my webApp uses connection
          pooling.
          > 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-instance
          will
          > be lost.
          > How do I have to configure my cluster to work well with that stuff ?
          >
          > Thank a lot,
          >
          > Markus.
          >
          >
          >

Problem in using connection pool in netbeans

Hi,
I am using Net Beans and Sun java application server and Derby as database.
I have created data connnection and also configure JDBC resources (ie. DataResource and connectionPool).
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Thanks bamkin-ov-lesta,
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IO Exception Broken Pipe ORA-17002 while using connection pooling

Hi
We are experiencing "broken pipe ORA-17002 error" when using connection pooling. This seems to be a common error when implementing connection pooling, but I didn't find any solution anywhere.
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The middle tier(Tomcat) runs on RedHat linux server
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kalle
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Sometimes before(before I started checking whether the connection is good )the application used to hang up at the point where I am issuing setAutoCommit(false).It never comes out from that statement.Is this something to do with theconnections being closed?
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As long as it doesn't hung up, I am fine. Because i am cathching the exceptions.
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kalle
Thank you very much for your advice!!!
Like you said, I started to check whether the connections are fine before giving them from the pool.I am executing a simple "select 'anil' from dual" and if its fine only then I return the connection. So far it seems to be fine. Also I am reopening the connections(closing the old ones and opening new connections) after every 12 hours.
As far as the JDBC driver is concerned, I already tried with Oracle 8i driver, it gave the same problems. I read that 9i driver might solve this problem, so I changed to the latest 9i driver (classes12_g.zip).
Sometimes before(before I started checking whether the connection is good )the application used to hang up at the point where I am issuing setAutoCommit(false).It never comes out from that statement.Is this something to do with theconnections being closed?
What I am afraid is, will the appilation get hung up even after I check the connection with select query and then issue autocommit(false)??
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As long as it doesn't hung up, I am fine. Because i am cathching the exceptions.
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}catch(Exception e) {
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return toolTipData;
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Hi, erveryone
I prepare to implement a servlet that access database and do sync with client.
When I access database, I would like to configure a datasource in weblogic and use connection pool.
In order to make servlet application run significantly faster, my servet how to use connection poo is much moreresonable?
For example, my servlet has many times database access. Is it true that geting and close a connection whenever
one time database access finished?
If from the servlet begins, the db connection is hold till servlet finalize. Will the solution affect the servlet performance? Is there any official document to introduce connection pool program? I search some documents.
<The Java EE 6Tutorial> introduce some simple intruduction about connection pool.

1. Use WebLogic Servers Data Source for Database Connections.
2. Open and close the connections where you need it. Dont open it in begin and close in finalise. That is bad practice.
3. Even when you invoke Connection.close () webLogic will not close the connection. it will commit the transaction and return it back to the pool rather than physically closing the DB connection.
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How To Use Connection Pooling in Struts.

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Read the documentation...?

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

Strange behaviour when using connection pooling with proxy authentication

All
I have developed an ASP.NET 1.1 Web application that uses ODP.NET 9.2.0.4 accessing Oracle Database 8i (which is to be upgraded to 10g in the coming months). I have enabled connection pooling and implemented proxy authentication.
I am observing a strange behaviour in the live environment. If two users (User 1 and User 2) are executing SQL statements at the same time (concurrent threads in IIS), the following is occurring:
* User 1 opens a new connection, executes a SELECT statement, and closes this connection. The audit log, which uses the USER function, shows User 1 executed this statement.
* User 2 opens the same connection (before it is released to the connection pool?), excutes an INSERT statement, and closes this connection. The audit log shows User 1, not User 2, executed this statement.
Is this a known issue when using connection pooling with proxy authentication? I appreciate your help.
Regards,
Chris

Hi Chris,
I tried to reproduce your complaint, but was unable to. I didnt use auditting however, just a series of "select user from dual" with proxy authentication. You might want to see if you can put together a small complete testcase for this and open a sr with support.
Cheers
Greg

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          List<String> n = (List<String>) sqlMapClientIbatis.queryForList("test");
          log.debug("n: " + n);
          log.info("Conexion a BD realizada.");
And my sqlMapConfig.xml is
<sqlMapConfig>
     <settings cacheModelsEnabled="true"
          enhancementEnabled="true"
          lazyLoadingEnabled="true"
          maxRequests="320"
          maxSessions="128"
          maxTransactions="32"/>
     <transactionManager type="JDBC">
          <dataSource type="DBCP">
               <property name="driverClassName" value="oracle.jdbc.OracleDriver" />
               <property name="url" value="${db.connectionURL}" />
<property name="username" value="${db.username}" />
<property name="password" value="${db.password}" />
          </dataSource>
     </transactionManager>
     <sqlMap resource="com/epcs/facturacionpostpago/activacionbb/db/statements.xml" />
</sqlMapConfig>
Can u give me an advice to set the connection pool please?
Thanx in advance!
Edited by: mgaldames on 02-jun-2010 10:54

According to a google hit, it looks like you should be able to do something like this:
http://www.j2eegeek.com/blog/2005/01/31/ibatis-where-have-you-been-all-my-life/
First, configure a datasource in the wls console, the example uses:
jdbc/jpetstoreDS
as the JNDI name.
Then it looks like the following syntax works for the mapping that refers to that datasource, keep in mind your servername/port may be different.
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sqlMapConfig PUBLIC "-//iBATIS.com//DTD SQL Map Config 2.0//EN" "http://www.ibatis.com/dtd/sql-map-config-2.dtd"?>
<sqlmapconfig>
<settings cacheModelsEnabled="false" enhancementEnabled=" true" lazyLoadingEnabled="true"
maxRequests="32" maxSessions="100" maxTransactions="100" useStatementNamespaces="false"/>
<transactionmanager type="JDBC">
<datasource type="JNDI">
<property name="context.java.naming.factory.initial" value="weblogic.jndi.WLInitialContextFactory"/>
<property name="context.java.naming.provider.url" value="t3://localhost:7001"/>
<property name="DataSource" value="jdbc/jpetstoreDS"/>
</datasource>
</transactionmanager>
<sqlmap resource="com/j2eegeek/ibatis/dao/maps/Account.xml"/>
</sqlmapconfig>

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