Problem loading jdbc driver in Tomcat

Hi,
I have got a connection to MySQL5.0 from TomCat 5.5.13, that was test correctly in development (JSC Upd 1) but I encounter the following deployment error :
com.sun.rave.web.ui.appbase.ApplicationException: org.apache.jasper.JasperException: org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.mysql.jdbc.Driver'
When I verify, I found that if I put the mysql Connector JDBC driver in <tomcat>/common/lib, there is no error.
But when the MySql Connector JDBC driver resides in <tomcat>/shared/lib, the error persists.
What's the difference ? shouldn't it work for both ?
Thanks in advance for any pointers and advise.

hmm... i guess that it's a must to include the lib at /common/lib instead of shared/lib .
Is there a Tomcat resource that I can read up on ?
rgds

Similar Messages

Beginner Has Problem With Loading JDBC Driver Using MySQL

Hi, I am having problem with loading JDBC driver, and need your diagnotic help.
1. I have installed MySQL (C:\mysql), created a databse (soup), and created a littel table (VIDEOS). I am able to see the table in the console:
sql> select * from videos
2. I have downloaded the latest version of Connector/J (mysql-connector-java-3.1.0-alpha.zip), and unzip the zip file into my C:\ directory.
3. I copied the mysql-connector-java-3.1.0-alpha-bin.jar to the C:\j2sdk1.4.1_02\jre\lib\ext folder and it is in my CLASSPATH
4. MySQL server is running
C:\> C:\mysql\bin\mysqld-nt --standalone
5. open another DOS window and use the database
mysql>USE SOUP
6. succesfully compiled a Java program (javac Test.java):
import java.sql.* ;
public class Test
public static void main( String[] args )
try
Class.forName("org.gjt.mm.mysql.Driver").newInstance();
try
Connection con = DriverManager.getConnection( "jdbc:mysql://localhost:3306/soup" );
try
Statement statement = con.createStatement();
ResultSet rs = statement.executeQuery("SELECT TITLE FROM VIDEOS");
while ( rs.next() )
System.out.println( rs.getString( "TITLE" ) );
rs.close();
statement.close();
catch ( SQLException e )
System.out.println( "JDBC error: " + e );
finally
con.close();
catch( SQLException e )
System.out.println( "could not get JDBC connection: " + e );
catch( Exception e )
System.out.println( "could not load JDBC driver: " + e );
7. when I run the Java program (java Test), I got
the message:
could not load JDBC driver: java.lang.ClassNotFoundException: org.gjt.mm.mysql.Driver
What am I missing?

Hi,
I missed to specify test in my last post.
Try running your program by explicitly setting the classspath when
running your program . java -classpath c:\mysql-connector-java-3.1.0-alpha-bin.jar test
Make sure your jar file contains org.gjt.mm.mysql.Driver class

I have a problem with JDBC Realm in Tomcat/Oracle/Win XP

I have a problem with JDBC Realm in Tomcat.
I have attached my server.xml file located in the
C:\Program Files\Apache Software Foundation\Tomcat 5.5\conf\server.xml
The Problem is that when I login I get the user name and password prompt but it does not resolve.
When I enter in the tomcat-users.xml password with memory realm uncommented it works fine.
C:\Program Files\Apache Software Foundation\Tomcat 5.5\conf\tomcat-users.xml
Is there a cache or something I need to reset for the JDBC Realm to work?
I have attached my tables and contents as well...
Did I miss something????
Thanks
Phil
server.xml
<Server port="8005" shutdown="SHUTDOWN">
<Listener className="org.apache.catalina.mbeans.ServerLifecycleListener" />
<Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
<Listener className="org.apache.catalina.storeconfig.StoreConfigLifecycleListener"/>

<GlobalNamingResources>

<Environment name="simpleValue" type="java.lang.Integer" value="30"/>
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<Service name="Catalina">

<Connector
port="8080" maxHttpHeaderSize="8192"
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connectionTimeout="20000" disableUploadTimeout="true" />

<Connector port="8009"
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<Engine name="Catalina" defaultHost="localhost">

<Realm className="org.apache.catalina.realm.JDBCRealm"
driverName="oracle.jdbc.driver.OracleDriver"
connectionURL="jdbc:oracle:thin:@localhost:1521:orcl"
connectionName="testName" connectionPassword="testPass"
userTable="users"
userNameCol="user_name"
userCredCol="user_pass"
userRoleTable="user_roles"
roleNameCol="role_name" />

<Host name="localhost" appBase="webapps"
unpackWARs="true" autoDeploy="true"
xmlValidation="false" xmlNamespaceAware="false">
</Host>
</Engine>
</Service>
</Server>
Tables
create table users
user_name varchar(15) not null primary key,
user_pass varchar(15) not null
create table roles
role_name varchar(15) not null primary key
create table user_roles
user_name varchar(15) not null,
role_name varchar(15) not null,
primary key( user_name, role_name )
select * from users;
----------------------+
| user_name | user_pass |
----------------------+
| tomcat | tomcat |
| user1 | tomcat |
| user2 | tomcat |
| user3 | tomcat |
----------------------+
select * from roles;
| role_name |
| tomcat |
| role1 |
select * from user_roles;
-----------------------+
| role_name | user_name |
-----------------------+
| tomcat | user1 |
| role1 | user2 |
| tomcat | tomcat |
| role1 | tomcat |
-----------------------+

Jan 2, 2008 11:49:35 AM org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on http-8080
Jan 2, 2008 11:49:35 AM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 734 ms
Jan 2, 2008 11:49:35 AM org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
Jan 2, 2008 11:49:35 AM org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/5.5.9
Jan 2, 2008 11:49:35 AM org.apache.catalina.realm.JDBCRealm start
SEVERE: Exception opening database connection
java.sql.SQLException: oracle.jdbc.driver.OracleDriver
     at org.apache.catalina.realm.JDBCRealm.open(JDBCRealm.java:684)
     at org.apache.catalina.realm.JDBCRealm.start(JDBCRealm.java:758)
     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1004)
     at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442)
     at org.apache.catalina.core.StandardService.start(StandardService.java:450)
     at org.apache.catalina.core.StandardServer.start(StandardServer.java:683)
     at org.apache.catalina.startup.Catalina.start(Catalina.java:537)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
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     at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409)
Jan 2, 2008 11:49:35 AM org.apache.catalina.core.StandardHost start
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Jan 2, 2008 11:49:36 AM org.apache.catalina.core.StandardContext resourcesStart

Java.sql.SQLException: Cannot load JDBC driver class 'null'

Hi,
I am a beginner of using jdbc, i use the tomcat4.1.x, mysql3.23.54 and it's jdbc driver 2.0.14. I place the drive <in jar file> in tomcat/commons/lib and configure the server.xml, web.xml and some testing coding. But there are some error like the following:
java.sql.SQLException: Cannot load JDBC driver class 'null'
     at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:529)
     at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:312)
     at foo.DBTest.init(DBTest.java:18)
     at org.apache.jsp.test_jsp._jspService(test_jsp.java:48)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:136)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:204)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:289)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:240)
of course its some of the error code and there are more.
Why I have this problems and how can I fix it? Can someone help me??
Thanks,
Tong
I place my test.jsp at tomcat/webapps/DBTest and DBTest.java at tomcat/webapps/DBTest/WEB-INF/classes/foo
additional of the tomcat/conf/server.xml
<Resource name="TestDB" auth="Container" type="javax.sql.DataSource" description="MySQL TestDB"/>
<ResourceParams name="TestDB">
<parameter><name>factory</name>
<value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
</parameter>
<parameter><name>maxActive</name><value>10</value></parameter>
<parameter><name>maxIdle</name><value>1</value></parameter>
<parameter><name>maxWait</name><value>10000</value></parameter>
<parameter><name>username</name><value>javauser</value></parameter>
<parameter><name>password</name><value>javadude</value></parameter>
<parameter>
<name>driverClassName</name>
<value>org.gjt.mm.mysql.Driver</value>
</parameter>
<parameter>
<name>url</name>
<value>jdbc:mysql://localhost:3306/javatest?autoReconnect=true</value>
</parameter>
</ResourceParams>
tomcat/webapps/DBTest/WEB-INF/web.xml :
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<description>MySQL Test App</description>
</web-app>

Post the part of your code that loads the driver and connects. My guess is you are using a variable for the name of the driver and the variable has not been set to anything(intially set to null).
Thanks
Cardwell

Problem with JDBC driver for Oracle 10g

Hi.
I've successfully accessed a MySQL database via a DataSource from a servlet (that uses a DAO). However, when I try to do the same with an Oracle 10g Database, I get the error message:
Cannot load JDBC driver class 'oracle.jdbc.driver.OracleDriver'
I'm using J2SE1.5.0/5.0 and ojdbc14.jar, the latter of which I downloaded this afternoon as the latest driver JAR available on the Oracle site. As with the MySQL driver, I've placed it in the commons\lib folder within Tomcat. (I've also, of course, made the necessary modifications to server.xml and web.xml.)
Upon examining the ReadMe file at the top of the Oracle download page, I found that the oracle.jdbc.driver package is now deprecated and all references to oracle.jdbc.driver should be replaced with oracle.jdbc. However, I got a similar error message when I tried this modification. Upon examining the contents of ojdbc.jar, I found that the driver was there and that it was, in fact, still oracle\jdbc\driver\OracleDriver!
It appears as though the Oracle site has not been updated with a driver that matches its latest documentation. However, this does not explain why the driver is not even being loacted when it is in the correct place. Can anybody shed any light on this? Any help would be much appreciated.
Thanks in anticipation.
Cheers.
Jan

I've successfully accessed a MySQL database via a
DataSource from a servlet (that uses a DAO). However,
when I try to do the same with an Oracle 10g
Database, I get the error message:
Cannot load JDBC driver class 'oracle.jdbc.driver.OracleDriver'
That's different from a ClassNotFoundException.
>
I'm using J2SE1.5.0/5.0 and ojdbc14.jar, the latter
of which I downloaded this afternoon as the latest
driver JAR available on the Oracle site. So you got ojdbc14.jar or ojdbc14_g.jar under the 10g drivers?
As with the
MySQL driver, I've placed it in the commons\lib
folder within Tomcat. I think it's a better idea to put in the WEB-INF/lib directory of your Web app rather than commons/lib. WAR files are a very good idea, too.
(I've also, of course, made the
necessary modifications to server.xml and web.xml.)So you're using a JNDI data source? It sounds to me like that's where the problem is.
You should not have to edit the server.xml at all. If you put the <ResourceParams> in a context XML file with the same name as your WAR file into the TOMCAT_HOME/webapps directory it'll be picked up automatically. (It might also be accessible in the META-INF directory for your app, but I haven't done it that way.)
Upon examining the ReadMe file at the top of the
Oracle download page, I found that the
oracle.jdbc.driver package is now deprecated and all
references to oracle.jdbc.driver should be replaced
with oracle.jdbc.
However, I got a similar error
message when I tried this modification. Upon
examining the contents of ojdbc.jar, I found that the
driver was there and that it was, in fact, still
oracle\jdbc\driver\OracleDriver! The fully-resolved class name you should be using MUST match the class that's in the ojdbc14.jar that you're using. Look in the JAR for the definitive answer: the one that I downloaded is still using the oracle.jdbc.driver package for OracleDriver.class. Ignore the docs - use the name that's in the JAR.
It appears as though the Oracle site has not been
updated with a driver that matches its latest
documentation. That often happens with docs.
However, this does not explain why the
driver is not even being loacted when it is in the
correct place. Can anybody shed any light on this?
Any help would be much appreciated.I think the problem lies in your web.xml and server.xml
I'd recommend that you decouple the JDBC from the Web app for now. See if you can connect to Oracle using a simple desktop app and leave the Web piece out of the equation for now. Once you can do that, you'll be certain that the parameters you're using are correct and you can turn your attention to getting the Tomcat configuration right.
PS - I'm using Oracle 9.2.0.1 and Tomcat successfully right now, so it can be done.

Cannot load JDBC Driver Class in Tomcat5.5 using struts.

Hello to all,
I'm working in the struts environment using Esclipse3.2 IDE.
And I have installed Tomcat5.5 server.I have created the LoginForm
in struts.Now i like to connect my LoginForm with MySql database.I
have also created the database in MySql naming strutsdatabase.
I had also download the mysql-connector-java-3.0.16-ga-bin.jar and
save that in C:/tomcat/commons/lib directory.
While running I have got the below error:
org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.mysql.jdbc.Driver'
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:766)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.setLogWriter(BasicDataSource.java:598)
at org.apache.struts.action.ActionServlet.initModuleDataSources(ActionServlet.java:808)
at org.apache.struts.action.ActionServlet.init(ActionServlet.java:335)
at javax.servlet.GenericServlet.init(GenericServlet.java:211)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1105)
Caused by: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
javax.servlet.UnavailableException: Initializing application data source org.apache.struts.action.DATA_SOURCE
at org.apache.struts.action.ActionServlet.initModuleDataSources(ActionServlet.java:812)
at org.apache.struts.action.ActionServlet.init(ActionServlet.java:335)
at javax.servlet.GenericServlet.init(GenericServlet.java:211)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1105)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:932)
And I have attached my struts-config.xml:
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software
Foundation//DTD Struts Configuration 1.2//EN"
"http://struts.apache.org/dtds/struts-config_1_2.dtd">
<struts-config>
<data-sources>
<data-source
type="org.apache.tomcat.dbcp.dbcp.BasicDataSource">
<set-property property="url"
value="jdbc:mysql://localhost:3306/strutsdatabase?autoReconnect
=true"/>
<set-property property="driverClassName"
value="com.mysql.jdbc.Driver"/>
<set-property property="username" value=""/>
<set-property property="password" value=""/>
<set-property property="maxActive" value="10"/>
<set-property property="validationQuery" value="SELECT
COUNT(*) FROM test"/>
<set-property property="maxWait" value="5000"/>
<set-property property="defaultAutoCommit" value="false"/>
</data-source>
</data-sources>
<form-beans>
<form-bean name="LoginForm"
type="fino.web.struts.action.LoginForm"/>
</form-beans>
<global-exceptions/>
<global-forwards/>
<action-mappings>
<action name="LoginForm" path="/login" scope="request"
type="fino.web.struts.action.LoginAction" validate="true">
<forward name="success" path="/success.jsp"/>
<forward name="failure" path="/failure.jsp"/>
</action>
</action-mappings>
<controller/>
<message-resources null="false"
parameter="org.apache.struts.action.ActionResources"/>
</struts-config>
Friends,please help me to find solution to this problem.

Note: This thread was originally posted in the [Java Compiler|http://forums.sun.com/forum.jspa?forumID=7] forum, but moved to this forum for closer topic alignment.

Urgent... unable to load JDBC driver

i have developed a servlet which will establish connection to mySQL.. but it couldn't load the JDBC driver even i placed
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import java.io.*;
import java.text.*;
import java.util.*;
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import javax.servlet.http.*;
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i already add new variable in environment variables
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Hey!
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Code:
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Found a solution!
For everyone who is interested:
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Java.sql.SQLException: Cannot load JDBC driver

THis topic has been discussed many many times but I still not able to connect to Oracle 8i from my servlet using Tomcat 4.1.12 on hp-ux and java1.3
I always got: java.sql.SQLException: Cannot load JDBC driver class 'null'
In server.xml:
<Context Path="/MyApp" docBase="MyApp" debug="0" reloadable="true" >
<Resource name="jdbc/ora" auth="Container" type="javax.sql.DataSource"/> <ResourceParams name="jdbc/ora" >
<parameter>
<name>username</name>
<value>myname</value>
</parameter>
<parameter> <name>password</name>
<value>mypassword</value>
</parameter>
<parameter> <name>driverClassName</name>
<value>oracle.jdbc.driver.OracleDriver</value>
</parameter>
<parameter>
<name>url</name>
<value>jdbc:oracle:thin:@myhostname:1521:ora</value>
</parameter> </ResourceParams>
</Context>
In MyApp/WEB-INF/web.xml:
<resource-ref>
<res-ref-name>jdbc/ora</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
The Oracle jdbc jar file classes12.jar is under common/lib in Tomcat's home. read Permission is there.
In the servlet:
init(ServletConfig config):
Context init = new InitialContext();
Context ctx = (Context) init.lookup("java:comp/env");
dataSource = (DataSource) ctx.lookup("jdbc/acdb");
doPost(..)
the error occured at :
synchronized (dataSource){
con = dataSource.getConnection();}
Thanks in advance!

Everything looks correct to me, except for one thing.
In your web.xml you have this:
<res-ref-name>jdbc/ora</res-ref-name> In your server.xml, you have this tag, which matches your web.xml:
<ResourceParams name="jdbc/ora" > But in your Java code, you've got this:
dataSource = (DataSource) ctx.lookup("jdbc/acdb"); When I've successfully set up a Web app data source, all three names had to agree. You either need to change your Java lookup name to "jdbc/ora" or change the web.xml and server.xml to "jdbc/acdb".
See if that does it. Everything else sounds correct to me. - MOD

Can't load jdbc driver in servlet

Dear All,
I have tried to connect to MS SQL SERVER 2000 through JDBC DRIVER FOR
SQLSERVER. However I receieved an error: can't load jdbc driver class:
null.
The following steps were what I did:
1.Set up SQL Server and create a few tables and users.
2.Config Server.xml
Add the following codes in /tomcat/conf/Server.xml
<Context path="/persistence" docBase="persistence" debug="0"
reloadable="true">
          <Resource name="jdbc/persistenceDB" auth="Container"
type="javax.sql.DataSource"/>
          <ResourceParams name="jdbc/PersistenceDB">
               <Parameter>
                    <name>user</name>
                    <value>kitty</value>
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               <Parameter>
                    <name>password</name>
                    <value>abc</value>
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               <Parameter>
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                    <value>com.microsoft.jdbc.sqlserver.SQLServerDriver</value>
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               <Parameter>
                    <name>url</name>
<value>jdbc:microsoft:sqlserver://localhost:1433;databaseName=persistence;selectMethod=cursor;</value>
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</Context>
3.Config my web application's web.xml
Added the following piece of code in WEB.XML
<resource-ref>
<res-ref-name>jdbc/persistenceDB</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
4.Use Datasource in my code
package persistence.database;
import java.sql.*;
import javax.naming.InitialContext;
import javax.sql.DataSource;
import javax.servlet.ServletContext;
import persistence.*;
import com.microsoft.jdbcx.sqlserver.*;
import javax.naming.Context;
public class DatabaseAuthenticator implements Authenticator {
private DataSource ds;
public void init(ServletContext sctx) throws Exception {
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Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs;
try {
if (ds != null) {System.out.println("Success to get
datasource");
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System.out.println(ds.toString());
try
conn = ds.getConnection();
catch (Exception e)
e.printStackTrace();
pstmt = conn.prepareStatement("SELECT user_id " + .........
5. put msutil.jar, mssqlserver.jar and msbase.jar under /tomcat/common/lib/.
When I tried to run the program, I receieved an error: can't load jdbc
driver class: null.
I've got no idea what's going on.
Any Suggestion?
Thanks in advance
Kitty

Hi Kitty,
The connection you're trying to set up points to nothing :
Connection conn = null;
So, you receive a complaint that that driver cannot be loaded. Please read
http://java.sun.com/docs/books/tutorial/jdbc/basics/connecting.html
download the right database driver and use that. Good luck!
Wouter van Reeven
public User authenticate(String username, String
g password)
throws AuthenticationException, UnknownException
ption {
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs;

Initialization error: Loading jdbc driver

Hi ,
In a file-XI-JDBC scenario, i am getting this error. "Initialization error: Loading jdbc driver 'com.microsoft.jdbc.sqlserver.SQLServerDriver' failed: java.lang.ClassNotFoundException: com.microsoft.jdbc.sqlserver".
but i have installed/deployed third party SQL driver on J2ee server thru SDM.
Can any one sort out this problem.
Rgds
Sridhar

Hi,
try looking into the log viewer in Vsual Administrator. Usually you can find more information about the problem there.
Also try redeploying the driver again.
cheers,
naveen

Load JDBC driver class 'null'

hi all :)
i'm using a datasource (tomcat 4.1.18 with jdk 1.4)
i'm the following error :
java.sql.SQLException: Cannot load JDBC driver class 'null'my classes12.jar find in $CATALINA_HOME/common/lib
where is ma error ?
thanks a lot.

GlobalNamingResources?
I sent up a data source for each app, like this:
<Context    path="/api-prototype"
            docBase="api-prototype.war"
            debug="1"
            reloadable="true"
            crossContext="true"
            useNaming="true">
    <Logger className="org.apache.catalina.logger.FileLogger"
            prefix="localhost-api-prototype-log."
            suffix=".txt"
            timestamp="true"/>
    <Resource   name="jdbc/APIPrototype"
                auth="Container"
                type="javax.sql.DataSource"/>

    <ResourceParams name="jdbc/APIPrototype">
        <parameter>
            <name>factory</name>
            <value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
        </parameter>
        <parameter>
            <name>driverClassName</name>
            <value>oracle.jdbc.driver.OracleDriver</value>
        </parameter>
        <parameter>
            <name>url</name>
            <value>jdbc:oracle:thin:@elvis:1521:CAPP</value>
        </parameter>
        <parameter>
            <name>username</name>
            <value>api</value>
        </parameter>
        <parameter>
            <name>password</name>
            <value>mod</value>
        </parameter>
        <parameter>
            <name>maxActive</name>
            <value>20</value>
        </parameter>
        <parameter>
            <name>maxIdle</name>
            <value>0</value>
        </parameter>
        <parameter>
            <name>maxWait</name>
            <value>60000</value>
        </parameter>
        <parameter>
            <name>removeAbandoned</name>
            <value>true</value>
        </parameter>
        <parameter>
            <name>removeAbandonedTimeout</name>
            <value>300</value>
        </parameter>
    </ResourceParams>
</Context>This works fine on Tomcat 4.1.24. I don't know where you got that example from, but I'd recommend that you look at the Tomcat JNDI How-to:
http://jakarta.apache.org/tomcat/tomcat-4.1-doc/jndi-datasource-examples-howto.html
Why go anywhere else? - MOD

Cannot load JDBC driver class 'com.microsoft.jdbc.sqlserver.SQLServerDriver

Hi,
i am doing a forum application.
i am trying to connect database connection through javax.sql.DataSource.
I am using Eclipse editor for developing this application and i am using sql server 2000 database.
i have create a servlet file.
here is the coding.
DatabaseGetConnection.java
`````````````````````````````````````````
import java.io.IOException;
import java.sql.Connection;
import java.sql.SQLException;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;
public class DatabaseGetConnection extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
private Connection con=null;
private DataSource ds=null;
public DatabaseGetConnection() throws ServletException {
super();
public DatabaseGetConnection(final HttpServletRequest req, final HttpServletResponse res) throws ServletException, IOException {
this.doPost(req, res);
public void init() throws ServletException {
try
final Context initContext = new InitialContext();
final Context envContext = (Context)initContext.lookup("java:/comp/env");
this.ds = (DataSource)initContext.lookup("jdbc/mySQLServer");
}catch(final NamingException ne)
ne.printStackTrace();
}catch(final Exception e)
e.printStackTrace();
public DataSource getDS()
System.out.println("Datasource method calling");
if (this.ds!=null)
System.out.println("Datasource not null");
}else
System.out.println("Datasource null");
return this.ds;
public Connection getCon()
try
this.con=this.getDS().getConnection();
if (this.con!=null)
System.out.println("Connection Successfull");
}catch(final SQLException se)
System.out.print("Connection Establishment Error : ");
se.printStackTrace();
return this.con;
I have configured server.xml. here is the configuration
server.xml
````````````````
<GlobalNamingResources>
<Resource name="jdbc/mySQLServer" global="jdbc/mySQLServer" auth="Container"
type="javax.sql.DataSource" factory="org.apache.tomcat.dbcp.dbcp.BasicDataSourceFactory" driverClassName="com.microsoft.jdbc.sqlserver.SQLServerDriver"
url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=forum;SelectMethod=cursor"
username="sa" password="sa" maxActive="20" maxIdle="10"
maxWait="-1"/>
</GlobalNamingResources>
here is the web.xml file
``````````````````````````````````
<resource-ref>
<res-ref-name>jdbc/mySQLServer</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
is this configuration correct? plz help me about the configuration and coding through Eclipse.
i have run the application and i got the error. here is the error details
org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.microsoft.jdbc.sqlserver.SQLServerDriver'
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:766)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:540)
at com.forum.database.DatabaseGetConnection.getCon(DatabaseGetConnection.java:85)
at com.forum.database.DatabaseGetConnection.GetAllTopicSearch(DatabaseGetConnection.java:101)
at org.apache.jsp.test_jsp._jspService(test_jsp.java:73)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:328)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: com.microsoft.jdbc.sqlserver.SQLServerDriver
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:760)
... 24 more
thanks and regards,
k.s.kumar

Please don't multipost, it's rude: http://forum.java.sun.com/thread.jspa?threadID=5219591
Please continue on that thread.

Cannot load JDBC driver class 'com.mysql.jdbc.Driver'

Hi,
At the moment I'm trying to get an example working. The error message I get is:
Unable to get connection, DataSource invalid: "org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.mysql.jdbc.Driver'"
The example I tried is http://tomcat.apache.org/tomcat-6.0-doc/jndi-datasource-examples-howto.html.
Configuration:
Wampserver 2.0 (Apache, MySQL, PHP for Windows XP), Tomcat 6.0 and jdk1.6.0_03.
The following files are installed in %CATALINA_HOME%/webabbs/
- Dbtest/test.jsp
- Dbtest/WEB-INF/web.xml
- Dbtest/WEB-INF/lib/standard.jar
- Dbtest/WEB-INF/lib/tomcat-dbcp.jar
- Dbtest/WEB-INF/lib/jstl.jar
Tia,
Abel.

Hi,
I added the jar file containing the requested class to my lib directory. So the current contents of that directory is:
The following files are installed in %CATALINA_HOME%/webabbs/
- Dbtest/test.jsp
- Dbtest/WEB-INF/web.xml
- Dbtest/WEB-INF/lib/standard.jar
- Dbtest/WEB-INF/lib/tomcat-dbcp.jar
- Dbtest/WEB-INF/lib/jstl.jar
- Dbtest/WEB-INF/lib/mysql-connector-java-5.1.5-bin.jar
More importantly, I started my Wamp server.
The example works as it should have. Thanks for the feedback.
Abel

Failed to load JDBC driver

I am trying to run a program and keep getting the error Failed to load JDBC driver. java.lang.ClassNotFoundException
How can I correct this?

I was just trying to execute this example from Deitel's Java book.
import java.awt.*;
import java.sql.*;
import java.util.*;
import javax.swing.*;
public class DisplayAuthors extends JFrame {
   // JDBC driver name and database URL
   static final String JDBC_DRIVER = "com.ibm.db2j.jdbc.DB2jDriver";
   static final String DATABASE_URL = "jdbc:db2j:books";
   // declare Connection and Statement for accessing
   // and querying database
   private Connection connection;
   private Statement statement;
   // constructor connects to database, queries database, processes
   // results and displays results in window
   public DisplayAuthors()
      super( "Authors Table of Books Database" );
      // connect to database books and query database
      try {
         // specify location of database on filesystem
         System.setProperty( "db2j.system.home", "C:/Cloudscape_5.0" );
         // load database driver class
         Class.forName( JDBC_DRIVER );
         // establish connection to database
         connection = DriverManager.getConnection( DATABASE_URL );
         // create Statement for querying database
         statement = connection.createStatement();
         // query database
         ResultSet resultSet =
            statement.executeQuery( "SELECT * FROM authors" );
         // process query results
         StringBuffer results = new StringBuffer();
         ResultSetMetaData metaData = resultSet.getMetaData();
         int numberOfColumns = metaData.getColumnCount();
         for ( int i = 1; i <= numberOfColumns; i++ )
            results.append( metaData.getColumnName( i ) + "\t" );
         results.append( "\n" );
         while ( resultSet.next() ) {
            for ( int i = 1; i <= numberOfColumns; i++ )
               results.append( resultSet.getObject( i ) + "\t" );
            results.append( "\n" );
         // set up GUI and display window
         JTextArea textArea = new JTextArea( results.toString() );
         Container container = getContentPane();
         container.add( new JScrollPane( textArea ) );
         setSize( 300, 100 ); // set window size
         setVisible( true );   // display window
      } // end try
      // detect problems interacting with the database
      catch ( SQLException sqlException ) {
         JOptionPane.showMessageDialog( null, sqlException.getMessage(),
            "Database Error", JOptionPane.ERROR_MESSAGE );
         System.exit( 1 );
      // detect problems loading database driver
      catch ( ClassNotFoundException classNotFound ) {
         JOptionPane.showMessageDialog( null, classNotFound.getMessage(),
            "Driver Not Found", JOptionPane.ERROR_MESSAGE );
         System.exit( 1 );
      // ensure statement and connection are closed properly
      finally {
         try {
            statement.close();
            connection.close();
         // handle exceptions closing statement and connection
         catch ( SQLException sqlException ) {
            JOptionPane.showMessageDialog( null,
               sqlException.getMessage(), "Database Error",
               JOptionPane.ERROR_MESSAGE );
            System.exit( 1 );
   } // end DisplayAuthors constructor
   // launch the application
   public static void main( String args[] )
      DisplayAuthors window = new DisplayAuthors();
      window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
} // end class DisplayAuthors

Problem loading jdbc driver in Tomcat

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