Java.sql.SQLException: Cannot load JDBC driver

Question

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!

Answer 1

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