Best way to implement connection pooling with tomcat4.0?
Hi all!
I need your help:
What's the best way to implement connection pooling (Oracle Database) with tomcat 4.0?
I only found ways to implement it in tomcat 4.1, not in 4.0....
Thanks!
Michael
You can use a Datasource managed by tomcat. Earlier versions of tomcat used Exolab's Tyrex for the implementation of the Datasource API which uses connection pooling. Current version uses commons-dbcp and commons-pool (jakarta projects) I think.
You've got to declare the Datasource in server.xml and then in web.xml of your web app.
Similar Messages
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The best way to implement connect pool?
Hi:
In my web application, I use javabean to access database for JSP, Because a lot of poeple will access my site, I need coonection pool. Then, If I still use JSP,Is it right I should use javabean to access coonection pool? If it is, Am I need another connection pool bean? Or I should switch to Servlet , I might need write a ancestor servlet to access the pool, and other servlet extend the ancestor servlet. Is there other suggestion for me?
I am a newer to java, any suggestion will be greatly appreciated!
Thanks a lot!
xufangHi, Gregor
Thanks for your reply, I instance my DBConnectionManager in the Bean's constructor as:
connMgr= connMgr.getInstance();
and in the bean's getConnection method, I request a connection provided by the pool as:
Connection dbCon = connMgr.getConnection("idb");
and and in the bean's execSQL method , I use the dbCon as:
s = dbCon.createStatement( );
ResultSet r = s.executeQuery(sql);
The problem is when JSP go to bean.getConnection,it's all right. But when JSP execute bean.execSQL, There is always wrong because the dbConn I get from the bean's getConnection method if null ! Can you tell me what's the problem arrives?
Thanks,
xufang -
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
ManishaI 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 -
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I have a selectOneRadio component that has an other option (see below). If the other option is selected I need to pull the value out of a text field. Any ideas on the best way (or any way) to
implement this?
This is how it looks on the screen...
Please select one...
o 10.00
o 20.00
o 30.00
o Other amount [ ] <--- Text box
When I try to access the value of the selectOneRadio component in the backing bean I get the index of the selection instead of the item value that was selected.
This is in 11g.
Any help would be appreciated.
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I came up with the following codes as I assume you populate the selectOneRadio from a VO. The inputText will only be rendered if the "Others" option is selected. And you can get the actual ID of the selected items instead of their index.
/** Jspx **/
<af:panelFormLayout partialTriggers="rdbPrice">
<f:facet name="footer"/>
<af:selectOneRadio value="#{bindings.SampleVO1.inputValue}"
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required="#{bindings.SampleVO1.hints.mandatory}"
shortDesc="#{bindings.SampleVO1.hints.tooltip}"
id="rdbPrice" autoSubmit="true">
<f:selectItems value="#{bindings.SampleVO1.items}"/>
</af:selectOneRadio>
<af:panelLabelAndMessage label="Label 1"
rendered="#{bindings.priceId.inputValue == 98}">
<af:inputText label="Label 1"
binding="#{backingbean.txtOthers}"
simple="true"/>
</af:panelLabelAndMessage>
</af:panelFormLayout>
/** PageDef **/
<bindings>
<list ...>
</list>
<attributeValues IterBinding="SampleVO1Iterator" id="priceId">
<AttrNames>
<Item Value="priceId"/>
</AttrNames>
</attributeValues>
</bindings>
/** backing bean **/
public void yourMethod() {
String priceId = getBeanValue("#{bindings.priceId.inputValue}").toString();
System.out.println(priceId);
}Note:
1) It is assumed that the value 98 refers to the "Others" ID value.
2) The priceId attribute type in the SampleVO has to be changed to Long (my default was Number).
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http://brendenanstey.blogspot.com/2007/03/how-to-reduce-coding-by-extending.html
Regards,
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Thanksuser13718790 wrote:
Hi,
I want to create a pool of connection objects and when multiple users query the database, the connection should be returned from the pool to the different users.It doesn't work like that. The connection cannot leave the application.
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"Daniel Selman" <[email protected]> wrote:
Ryan,
Check out the thread (a few days old) titled "Different ways of creating
portlets".
Sincerely,
Daniel Selman
"Ryan Richards" <[email protected]> wrote in message
news:3d2eda12$[email protected]..
I have a few existing applications that I need to port over to portletsin
Weblogic
Portal 4.0. One application is a servlet based web application witha few
html front-end
screens. I am trying to determine how to do this in the best way. Ihave
noticed
that portlets behave differently inside the portal than do stand-aloneweb
apps.
Any help would be appreciated.
The other web application is the Microsoft Outlook Web Access. (Thisone
is going
to be difficult because it is actually an ASP app. I dont know if thisis
possible
without building some proxy code between bea and iis.)
Thanks
Ryan -
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All
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* 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.
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The event structure can have a 1 sec timeout, in which you queue up a Measure command.
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The general (smart) way to setup the queue is with a cluster containing 2 elements, a typedef'd Command and a variant.
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If, e.g. you press the Enable button on a channel, you can enqueue Enable and the channel number.
/Y
LabVIEW 8.2 - 2014
"Only dead fish swim downstream" - "My life for Kudos!" - "Dumb people repeat old mistakes - smart ones create new ones."
G# - Free award winning reference based OOP for LV -
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I am trying to read a collection of countries (Strings) into a collection inside a Movie object. The countries reside in a separate DB table with a FK referencing the Movie.
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El 16/05/2009, a las 14:01, lee704 <[email protected]> escribió:
>
Thanks. Are there sample data entry apps in the Tour de Flex samples?
> -
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HI,
what is the best way to implement a request -response paradigm and still have
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anybody gives suggestions..
Akhil
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http://edocs.bea.com/wls/docs81/jms/implement.html#1294809
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Tom, BEA
Akhil Nagpal wrote:
> HI,
> what is the best way to implement a request -response paradigm and still have
> the reliability that message will be 100% processed and give response...do i need
> to create the permanant queues with storage..
>
> anybody gives suggestions..
> Akhil
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All JPA strategies require something (like a table or sequence object) be in the database, with table sequencing being the most portable, though EclipseLink does allow custom sequence stratgies where you could use something else, such as the UUID. Sequencing is described here described here http://wiki.eclipse.org/EclipseLink/Examples/JPA/PrimaryKey with a custom UUID example shown here http://wiki.eclipse.org/EclipseLink/Examples/JPA/CustomSequencing .
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