Did you get my messages?
-----Original Message-----
From: Mark <[EMAIL PROTECTED]>
To: Tomcat Users List <[EMAIL PROTECTED]>
Date: Thursday, November 29, 2001 2:20 PM
Subject: Re: OKAY: HERE GOES. THIS IS GETTING INTERESTING. Re: Tomcat
4.0/JDBC driver configuration?
>To answer your question, yes I understand what a servlet's init() method is
>and when it's called. You've provided valuable information and I
>basically understand it, providing jdbc setup info through init-params in
>web.xml. I'll definitely plan on looking closer at javax.jdbc - I've only
>used the (as you put it) 'kiddy' jdbc stuff in the past.
>
>However, my question is about the physical location of the jdbc driver .jar
>file. In other environments I've worked with, including the location of
>the .jar in the CLASSPATH was sufficient. With Tomcat, does one have to
>copy the driver to ../common/lib? If so, that doesn't seem like a very
>good situation to be in especially in a production environment. I tried to
>modify CLASSPATH in the startup scripts to see if that'd work, but
>everything went haywire after that under Win2k - *nothing* worked even
>after backing out the simple change (even had to reboot to get things in
>working order again).
>
>I suspect I'm again missing/not understanding something.
>
>Thanks again for your help...
>Mark
>
>
>At 10:17 AM 11/29/2001 -0800, you wrote:
>>Hi, Mark,
>>
>>Moving on, I see. Great! Here is a bunch of junk to look at and maybe
>>learn from. (I don't mind ending sentences prepositions with.) First is
>>this little way to get a connection from a PostgreSQL driver using
>>DataSource. I assume you will be using DataSource and not the kiddies
>>version of jdbc, i.e. you will be using the jdbc extension, I assume. If
>>not, you should. I don't want to bother talking about the kiddy version,
>>which is well-covered in Sun tutorials. If I seem to talk about the kiddy
>>version with disdain, that is the correct impression. ///;-)
>>
>>Once you have the industrial strength jdbc set up with DataSource, the
rest
>>should be somewhat obvious. There is nothing really tricky or special
about
>>Tomcat in this regard.
>>
>>What I definitely like to do is to get all the database "parameters" as
you
>>say established with start up in Tomcat, so I put it all in a StartUp
>>servlet that has an init() method. Before I go on, I will stop and ask if
>>you know what an init() method with a servlet does?
>>
>>
>>NOTICE THAT THE jdbcURL, etc. used in the start up servlet come from the
>>web.xml specification that is for the start up servlet and ServletConfig,
>>i.e. are for init() parameters in web.xml.
>>
>>Also note the resource reference in the web.xml at the bottom. You are
>>beginning to get into a bit more complicated area. You have to include
your
>>jar or classes for a driver just like you do any classes or jars. Jars
are
>>jars and classes are classes and they all are found in the same way. I
also
>>use Tomcat in the context of an application server, running in the same
JVM,
>>so I have not shown a lot I do in relation to JMX specifications and
MBeans
>>and MLET classes which pop all I show here into a JNDI context. But, that
>>should not be a problem.
>>
>>Please do not fail to stop and learn the DataSource and jdbc extension
>>stuff. You have to get an advanced driver when you do this. The kiddy
>>drivers do not work with or have DataSource implementations. You need to
do
>>some scouting and reading on this, if you are not already up to speed.
When
>>I find out how much you know about this, then I can point you better.
>>
>>Micael
>>
>>Below are:
>>
>> 1. A little made up class to get a DataSource connection or Connection
>>object.
>>
>> 2. A more developed web.xml than I have shown you before.
>>
>> 3. A StartUp servlet which is fairly sophisticated.
>>
>>Have fun and let me know how it goes, if you would. I have an interest in
>>seeing how you progress with all this, because we all have to train people
>>new at things.
>>
>>Micael, again
>>
>>///;-)
>>
>>
>>
>>///////////////////////////////////////////////////
>>
>>public class PostgresqlConnection {
>> private Connection conn;
>> private String user;
>> private String password;
>>
>> public Connection getConnection(String user, String password) throws
>>ClassNotFoundException, SQLException {
>> Class.forName("org.postgresql.Driver");
>> PostgresqlDataSource dataSource = new PostgresqlDataSource();
>> conn = dataSource.getConnection(user, password);
>> return conn;
>> }
>>}
>>
>>//////////////////////////////////////////////////
>>
>><?xml version="1.0" encoding="ISO-8859-1"?>
>>
>><!DOCTYPE web-app
>> PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
>> "http://java.sun.com/j2ee/dtds/web-app_2.2.dtd";>
>>
>><web-app>
>> <servlet>
>> <servlet-name>authenticate</servlet-name>
>> <servlet-class>AppAuthenticateServlet</servlet-class>
>> </servlet>
>>
>> <servlet>
>> <servlet-name>action</servlet-name>
>> <servlet-class>ActionServlet</servlet-class>
>> <init-param>
>> <param-name>action-mappings</param-name>
>> <param-value>actions</param-value>
>> </init-param>
>> </servlet>
>>
>> <servlet>
>> <servlet-name>setup</servlet-name>
>> <servlet-class>SetupServlet</servlet-class>
>> <init-param>
>> <param-name>jdbcDriver</param-name>
>> <param-value>org.postgresql.Driver</param-value>
>> </init-param>
>>
>> <init-param>
>> <param-name>jdbcURL</param-name>
>> <param-value>
>> jdbc:postgresql://localhost:5432/db
>> </param-value>
>> </init-param>
>>
>> <init-param>
>> <param-name>jdbcUser</param-name>
>> <param-value>db</param-value>
>> </init-param>
>>
>> <init-param>
>> <param-name>jdbcPwd</param-name>
>> <param-value>yobyor</param-value>
>> </init-param>
>>
>> <load-on-startup/>
>> </servlet>
>>
>> <servlet-mapping>
>> <servlet-name>action</servlet-name>
>> <url-pattern>*.do</url-pattern>
>> </servlet-mapping>
>>
>> <servlet-mapping>
>> <servlet-name>authenticate</servlet-name>
>> <url-pattern>/authenticate</url-pattern>
>> </servlet-mapping>
>>
>> <welcome-file-list>
>> <welcome-file>index.jsp</welcome-file>
>> </welcome-file-list>
>>
>> <taglib>
>> <taglib-uri>utilities</taglib-uri>
>> <taglib-location>/WEB-INF/tlds/utilities.tld</taglib-location>
>> </taglib>
>>
>> <taglib>
>> <taglib-uri>application</taglib-uri>
>> <taglib-location>/WEB-INF/tlds/app.tld</taglib-location>
>> </taglib>
>>
>> <taglib>
>> <taglib-uri>i18n</taglib-uri>
>> <taglib-location>/WEB-INF/tlds/i18n.tld</taglib-location>
>> </taglib>
>>
>> <taglib>
>> <taglib-uri>security</taglib-uri>
>> <taglib-location>/WEB-INF/tlds/security.tld</taglib-location>
>> </taglib>
>>
>> <taglib>
>> <taglib-uri>database</taglib-uri>
>> <taglib-location>/WEB-INF/tlds/database.tld</taglib-location>
>> </taglib>
>>
>> <taglib>
>> <taglib-uri>html</taglib-uri>
>> <taglib-location>/WEB-INF/tlds/html.tld</taglib-location>
>> </taglib>
>>
>> <taglib>
>> <taglib-uri>logic</taglib-uri>
>> <taglib-location>/WEB-INF/tlds/logic.tld</taglib-location>
>> </taglib>
>>
>> <taglib>
>> <taglib-uri>dom</taglib-uri>
>> <taglib-location>/WEB-INF/tlds/dom.tld</taglib-location>
>> </taglib>
>>
>> <taglib>
>> <taglib-uri>xslt</taglib-uri>
>> <taglib-location>/WEB-INF/tlds/xslt.tld</taglib-location>
>> </taglib>
>>
>> <taglib>
>> <taglib-uri>regions</taglib-uri>
>> <taglib-location>/WEB-INF/tlds/regions.tld</taglib-location>
>> </taglib>
>>
>> <taglib>
>> <taglib-uri>xpath</taglib-uri>
>> <taglib-location>/WEB-INF/tlds/xpath.tld</taglib-location>
>> </taglib>
>>
>> <taglib>
>> <taglib-uri>tokens</taglib-uri>
>> <taglib-location>/WEB-INF/tlds/tokens.tld</taglib-location>
>> </taglib>
>>
>> <resource-ref>
>> <description>Primary database</description>
>> <res-ref-name>PostgresDS</res-ref-name>
>> <res-type>javax.sql.DataSource</res-type>
>> <res-auth>CONTAINER</res-auth>
>> </resource-ref>
>>
>> <security-constraint>
>> <web-resource-collection>
>> <web-resource-name>Credit Card Page</web-resource-name>
>> <url-pattern>/WEB-INF/jsp/createAccount/content.jsp</url-pattern>
>> </web-resource-collection>
>> <user-data-constraint>
>> <transport-guarantee>CONFIDENTIAL</transport-guarantee>
>> </user-data-constraint>
>> </security-constraint>
>>
>></web-app>
>>
>>////////////////////////////////////////////////////////
>>
>>SETUP SERVLET
>>import java.sql.Connection;
>>import java.sql.ResultSet;
>>import java.sql.ResultSetMetaData;
>>import java.sql.Statement;
>>import java.sql.SQLException;
>>
>>import javax.servlet.ServletConfig;
>>import javax.servlet.ServletContext;
>>import javax.servlet.ServletException;
>>import javax.servlet.http.HttpServlet;
>>
>>import beans.app.User;
>>import beans.app.Users;
>>import beans.jdbc.DbConnectionPool;
>>
>>public class SetupServlet extends HttpServlet implements
>>beans.app.Constants, tags.jdbc.Constants {
>> private DbConnectionPool pool;
>>
>> public void init(ServletConfig config) throws ServletException{
>> super.init(config);
>>
>> ServletContext ctx = config.getServletContext();
>> createDbConnectionPool(config, ctx);
>>
>> try {
>> ctx.setAttribute(USERS_KEY, loadUsers(ctx));
>> } catch(SQLException ex) {
>> throw new ServletException(ex);
>> }
>> }
>>
>> public void destroy() {
>> ServletContext ctx = getServletConfig().getServletContext();
>> ctx.removeAttribute(DBPOOL_KEY);
>> ctx.removeAttribute(USERS_KEY);
>>
>> pool.shutdown();
>> pool = null;
>> super.destroy();
>> }
>>
>> private void createDbConnectionPool(ServletConfig config,
ServletContext
>>ctx) {
>> pool = new DbConnectionPool(
>> config.getInitParameter("jdbcDriver"),
>> config.getInitParameter("jdbcURL"),
>> config.getInitParameter("jdbcUser"),
>> config.getInitParameter("jdbcPwd"));
>> ctx.setAttribute(DBPOOL_KEY, pool);
>> }
>>
>> private Users loadUsers(ServletContext ctx) throws SQLException {
>> Connection conn = null;
>>
>> if(pool != null) {
>> try {
>> // wait for a maximum of 10 seconds for a connection
>> // if pool is full
>> conn = (Connection)pool.getConnection(10000);
>> } catch(Exception ex) {
>> throw new SQLException(ex.getMessage());
>> }
>> Statement stmt = conn.createStatement();
>> ResultSet rs = stmt.executeQuery("SELECT * FROM USERS");
>> Users users = new Users(rs);
>>
>> pool.recycleConnection(conn);
>> return users;
>> }
>> return null;
>> }
>>}
>>
>>
>>-----Original Message-----
>>From: Mark <[EMAIL PROTECTED]>
>>To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
>>Date: Thursday, November 29, 2001 8:58 AM
>>Subject: Tomcat 4.0/JDBC driver configuration?
>>
>>
>>>Can someone point me in the right direction or provide an example of
>>>configuring an application to use JDBC under Tomcat 4.0? I was able to
use
>>>both thin and OCI Oracle JDCB drover connections by copying the
>>>classes12.zip to $CATALINA_HOME/common/lib directory and renaming it to
>>>classes12.jar, but that's not a good long term solution. I found having
>>>the driver in the CLASSPATH doesn't work.
>>>
>>>I suspect web.xml and/or server.xml is the place to configure the
>>>deployment details. Any examples or references to examples would be
>>>greatly appreciated.
>>>
>>>Mark
>>>
>>>
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>>>
>>
>>
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>>
>
>
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