Loggin my web application

Question

Hi!
I'm extending the org.apache.log4j.jdbc.JDBCAppender to log my web application directly in a database.
OK, this is my code:
package dbweb.logging;
import java.sql.*;
import javax.sql.*;
import java.util.*;
import javax.naming.*;
public class JDBCAppender extends org.apache.log4j.jdbc.JDBCAppender {
    private InitialContext context;
    private ResourceBundle webappconf;
    private String admindb;
    private DataSource datasource;
    public JDBCAppender() {
        super();
        try {
            context = new InitialContext();
            // Get ConnectionPool
            datasource = (DataSource) context.lookup("comp/env/jdbc/MyConnectionPool");
        } catch (javax.naming.NamingException nEx) {
            System.out.println(nEx.getExplanation());
    protected Connection getConnection() {
        try {
            connection = datasource.getConnection();
            connection.getAutoCommit();
            return connection;
        } catch (SQLException sqlEx) {
            System.out.println(sqlEx.getMessage());
            return null;
    protected void closeConnection(Connection con) {
        try {
            con.close();
        } catch (SQLException sqlEx) {
            System.out.println(sqlEx.getMessage());
    protected String getLogStatement(org.apache.log4j.spi.LoggingEvent event) {
        // MAKE STATEMENT
        return sqlStatement;
}When I try to get my web application ConnectionPool it seems that the JDBCAppender InitialContex isn't the web application one, in fact this command:
datasource = (DataSource) context.lookup("comp/env/jdbc/MyConnectionPool");returns null, therefore my web application crashes when I try to log a message. This is the error:
No object bound to name java comp/env/jdbc/MyConnectionPool
How can I do to get my web application Connection Pool???
Thanks in advance.
+ Anhur +

Answer 1

You must have the context stated in your server.xml and web.xml file. I don't know what server you are using, but you will have to consult the documentation to see where this goes. For example, in Tomcat 5.5 you would have to do the following:
1) Add the following to server.xml:
<GlobalNamingResources>
    <Environment name="simpleValue" type="java.lang.Integer" value="30"/>
    <Resource name="jdbc/MyConnectionPool"
                auth="Container"
                type="javax.sql.DataSource"
                driverClassName="your.driver.DBDriver"
                factory="org.apache.tomcat.dbcp.dbcp.BasicDataSourceFactory"
                url="jdbc:driver:@your.dbserver.com:1200:dbname"
                username="user"
                password="pass"
                maxActive="20"
                maxIdle="10"
                maxWait="-1" />
...2) In context.xml
<ResourceLink global="jdbc/MyConnectionPool" name="jdbc/MyConnectionPool" type="javax.sql.DataSource"/>3) In yourapp/WEB-INF/web.xml:
        <resource-ref>
          <res-ref-name>jdbc/MyConnectionPool</res-ref-name>
          <res-type>javax.sql.DataSource</res-type>
          <res-auth>Container</res-auth>
     </resource-ref>