Configuring and using DataSource in Tomcat (Apache Users)

Hi, everybody:

I am new in doing web applications and new in using tomcat. I am having trouble configuring and using DataSource in Tomcat. Hope someone could see where the problem is.

About the database:

hostname is sb.lehman.cuny.edu

schema name (sqlplus account name) is devtrack

listener port is 1521

Oracle SID is idm0

1. J2SE SDK version on my PC: 1.5.0_11

2. File name and location of the JDBC driver:

File name: ojdbc14dms.jar. I put it in c:\tomcat\common\lib. The driver file is copied from the JDeveloper that runs on the same PC as I run Tomcat. The JDeveloper runs servlets OK on the PC and accesses the same database OK with the 1.5.0_11 J2SE SDK.

3. The web.xml file

At the very beginning of the application's deployment descriptor (c:\tomcat\webapps\myApp\WEB-INF\web.xml), I declared the JNDI reference for the database. Here is the beginning portion of the web.xml file:

<?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>

<resource-ref>

Resource reference to a factory for java.sql.Connection instances

</description>

<res-ref-name>

jdbc/DBDevTrackConnDS

</res-ref-name>

<res-type>

javax.sql.DataSource

</res-type>

<res-auth>

Container

</res-auth>

</resource-ref>

4. The c:\tomcat\conf\context.xml file

I added the <Resource> element in the context.xml. The entire file of c:\tomcat\conf\context.xml is as follows:

<!--

-->

<Resource name="jdbc/DBDevTrackConnDS"

auth="Container"

type="javax.sql.DataSource"

username="devtrack"

password="test123"

driverClassName="oracle.jdbc.driver.OracleDriver"

url="">

maxActive="8"

maxIdle="4" />

</Context>

5. The servlet file.

The init() method in the serverlet file (for obtaining a DataSource object):

public class LoginServletNew extends HttpServlet {

PrintWriter out = null;

DataSource ds = null;

public void init() {

try {

Context initCtx = new InitialContext();

Context envCtx = (Context) initCtx.lookup("java:comp/env");

ds = (DataSource) envCtx.lookup("jdbc/DBDevTrackConnDS");

} catch (NamingException e) {

e.printStackTrace();

}

The login() method that uses the DataSource:

boolean login(String userName, String password) {

try {

Connection con = ds.getConnection();

Statement s = con.createStatement();

String sql = "SELECT LDAP_UID FROM Users" +

" WHERE LDAP_UID='" + userName + "'" + " AND USER_TYPE='" + password + "'";

ResultSet rs = s.executeQuery(sql);

if (rs.next()) {

out.println("uid from query: " + rs.getString(1));

rs.close();

s.close();

con.close();

return true;

}

rs.close();

s.close();

con.close();

}

6. The trouble:

The servlet compiles OK. It runs OK when the user is presented with the login form. But when the submit button is clicked that submits the username and password (i.e., the login() method is called), the browser receives an err page with the root cause as NoClassDefFoundError:

root cause

java.lang.NoClassDefFoundError: oracle/dms/instrument/ExecutionContextForJDBC

In the localhost.2007-10-02.log file, the root cause stack is as follows:

SEVERE: Servlet.service() for servlet NewLogin threw exception

java.lang.NoClassDefFoundError: oracle/dms/instrument/ExecutionContextForJDBC

at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:322)

at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:151)

at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32)

at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:608)

at org.apache.tomcat.dbcp.dbcp.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:37)

at org.apache.tomcat.dbcp.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:290)

at org.apache.tomcat.dbcp.dbcp.BasicDataSource.validateConnectionFactory(BasicDataSource.java:877)

at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:851)

at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:540)

at LoginServletNew.login(LoginServletNew.java:95)

at LoginServletNew.doPost(LoginServletNew.java:77)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)

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.Http11AprProcessor.process(Http11AprProcessor.java:834)

at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:640)

at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1286)

at java.lang.Thread.run(Unknown Source)

It seems to me that even though the JDBC driver was found and compilation was OK at compile time, it cannot be found at runtime. But it is not clear to me what is wrong and how to correct it. It would be very much appreciated if someone with experienced eye could spot the cause of the error and help me out.

Jason