Hello, I need some help with my database access application.
I am running Tomcat 6.0.16-6.4 installed from the OpenSUSE repositories. I am
trying to connect to MySQL 5.0.51a-27.2.
I have mysql-connector-java-5.1.7-bin.jar in the tomcat6/lib directory.
I have not modified server.xml or context.xml in tomcat6/conf - I include them
for reference
server.xml
<code>
<?xml version='1.0' encoding='utf-8'?>
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!-- Note: A "Server" is not itself a "Container", so you may not
define subcomponents such as "Valves" at this level.
Documentation at /docs/config/server.html
-->
<Server port="8005" shutdown="SHUTDOWN">
<!--APR library loader. Documentation at /docs/apr.html -->
<Listener className="org.apache.catalina.core.AprLifecycleListener"
SSLEngine="on" />
<!--Initialize Jasper prior to webapps are loaded. Documentation at
/docs/jasper-howto.html -->
<Listener className="org.apache.catalina.core.JasperListener" />
<!-- JMX Support for the Tomcat server. Documentation at
/docs/non-existent.html -->
<Listener className="org.apache.catalina.mbeans.ServerLifecycleListener" />
<Listener
className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
<!-- Global JNDI resources
Documentation at /docs/jndi-resources-howto.html
-->
<GlobalNamingResources>
<!-- Editable user database that can also be used by
UserDatabaseRealm to authenticate users
-->
<Resource name="UserDatabase" auth="Container"
type="org.apache.catalina.UserDatabase"
description="User database that can be updated and saved"
factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
pathname="conf/tomcat-users.xml" />
</GlobalNamingResources>
<!-- A "Service" is a collection of one or more "Connectors" that share
a single "Container" Note: A "Service" is not itself a "Container",
so you may not define subcomponents such as "Valves" at this level.
Documentation at /docs/config/service.html
-->
<Service name="Catalina">
<!--The connectors can use a shared executor, you can define one or more
named thread pools-->
<!--
<Executor name="tomcatThreadPool" namePrefix="catalina-exec-"
maxThreads="150" minSpareThreads="4"/>
-->
<!-- A "Connector" represents an endpoint by which requests are received
and responses are returned. Documentation at :
Java HTTP Connector: /docs/config/http.html (blocking & non-blocking)
Java AJP Connector: /docs/config/ajp.html
APR (HTTP/AJP) Connector: /docs/apr.html
Define a non-SSL HTTP/1.1 Connector on port 8080
-->
<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
<!-- A "Connector" using the shared thread pool-->
<!--
<Connector executor="tomcatThreadPool"
port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
-->
<!-- Define a SSL HTTP/1.1 Connector on port 8443
This connector uses the JSSE configuration, when using APR, the
connector should be using the OpenSSL style configuration
described in the APR documentation -->
<!--
<Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true"
maxThreads="150" scheme="https" secure="true"
clientAuth="false" sslProtocol="TLS" />
-->
<!-- Define an AJP 1.3 Connector on port 8009 -->
<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />
<!-- An Engine represents the entry point (within Catalina) that processes
every request. The Engine implementation for Tomcat stand alone
analyzes the HTTP headers included with the request, and passes them
on to the appropriate Host (virtual host).
Documentation at /docs/config/engine.html -->
<!-- You should set jvmRoute to support load-balancing via AJP ie :
<Engine name="Standalone" defaultHost="localhost" jvmRoute="jvm1">
-->
<Engine name="Catalina" defaultHost="localhost">
<!--For clustering, please take a look at documentation at:
/docs/cluster-howto.html (simple how to)
/docs/config/cluster.html (reference documentation) -->
<!--
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>
-->
<!-- The request dumper valve dumps useful debugging information about
the request and response data received and sent by Tomcat.
Documentation at: /docs/config/valve.html -->
<!--
<Valve className="org.apache.catalina.valves.RequestDumperValve"/>
-->
<!-- This Realm uses the UserDatabase configured in the global JNDI
resources under the key "UserDatabase". Any edits
that are performed against this UserDatabase are immediately
available for use by the Realm. -->
<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
resourceName="UserDatabase"/>
<!-- Define the default virtual host
Note: XML Schema validation will not work with Xerces 2.2.
-->
<Host name="localhost" appBase="webapps"
unpackWARs="true" autoDeploy="true"
xmlValidation="false" xmlNamespaceAware="false">
<!-- SingleSignOn valve, share authentication between web applications
Documentation at: /docs/config/valve.html -->
<!--
<Valve className="org.apache.catalina.authenticator.SingleSignOn" />
-->
<!-- Access log processes all example.
Documentation at: /docs/config/valve.html -->
<!--
<Valve className="org.apache.catalina.valves.AccessLogValve"
directory="logs"
prefix="localhost_access_log." suffix=".txt" pattern="common"
resolveHosts="false"/>
-->
</Host>
</Engine>
</Service>
</Server>
</code>
context.xml
<code>
<?xml version='1.0' encoding='utf-8'?>
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!-- The contents of this file will be loaded for each web application -->
<Context>
<!-- Default set of monitored resources -->
<WatchedResource>WEB-INF/web.xml</WatchedResource>
<!-- Uncomment this to disable session persistence across Tomcat restarts
-->
<!--
<Manager pathname="" />
-->
<!-- Uncomment this to enable Comet connection tacking (provides events
on session expiration as well as webapp lifecycle) -->
<!--
<Valve className="org.apache.catalina.valves.CometConnectionManagerValve" />
-->
</Context>
</code>
My application 'AuthExample' is deployed as a war file which expands to ...
<code>
total 40
drwxr-sr-x 2 tomcat tomcat 4096 Mar 3 13:24 META-INF
drwxr-sr-x 4 tomcat tomcat 4096 Mar 3 13:24 WEB-INF
-rw-r--r-- 1 tomcat tomcat 8293 Mar 3 13:23 index.jsp
-rw-r--r-- 1 tomcat tomcat 448 Mar 3 13:23 process2.jsp
-rw-r--r-- 1 tomcat tomcat 243 Mar 3 13:23 retry.jsp
-rw-r--r-- 1 tomcat tomcat 251 Mar 3 13:23 success.jsp
-rw-r--r-- 1 tomcat tomcat 6493 Mar 3 13:23 webtoolkit.md5.js
./META-INF:
total 8
-rw-r--r-- 1 tomcat tomcat 102 Mar 3 13:23 MANIFEST.MF
-rw-r--r-- 1 tomcat tomcat 378 Mar 3 13:23 context.xml
./WEB-INF:
total 12
drwxr-sr-x 3 tomcat tomcat 4096 Mar 3 13:24 classes
drwxr-sr-x 2 tomcat tomcat 4096 Mar 3 13:24 lib
-rw-r--r-- 1 tomcat tomcat 945 Mar 3 13:23 web.xml
./WEB-INF/classes:
total 4
drwxr-sr-x 3 tomcat tomcat 4096 Mar 3 13:24 com
./WEB-INF/classes/com:
total 4
drwxr-sr-x 2 tomcat tomcat 4096 Mar 3 13:24 aricent
./WEB-INF/classes/com/aricent:
total 4
-rw-r--r-- 1 tomcat tomcat 2182 Mar 3 13:23 Login.class
./WEB-INF/lib:
total 0
</code>
META-INF/context.xml
<code>
<?xml version="1.0" encoding="UTF-8"?>
<Context path="/AuthExample">
<Resource name="jdbc/AuthExample"
auth="Container"
type="javax.sql.DataSource"
driverClassName="com.mysql.jdbc.Driver"
url='jdbc:mysql://localhost:3306/javaexamples?validationQuery="select
1"'
username="Validate"
password="Authenticate"/>
</Context>
</code>
WEB-INF/web.xml
<code>
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd";
version="2.4">
<display-name>Authentication Example</display-name>
<description>
This is an examlpe servlet for User Authentication.
</description>
<servlet>
<servlet-name>AuthExample</servlet-name>
<servlet-class>com.xxxx.AuthExample</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>AuthExample</servlet-name>
<url-pattern>/authenticate</url-pattern>
</servlet-mapping>
<resource-ref>
<description>jdbc/AuthExample</description>
<res-ref-name>jdbc/AuthExample</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
</web-app>
</code>
Login,java
<code>
package com.xxxx;
import java.sql.*;
import javax.sql.*;
import javax.naming.*;
public class Login {
private Connection dbConn;
public Login() {
}
public boolean authenticate(String username2, String password2) {
DataSource ds = null;
try {
Context ctx = new InitialContext();
ds =
(DataSource)ctx.lookup("java:comp/env/jdbc/AuthExample");
} catch (NamingException e1) {
System.out.println("Login:authenticate:Context Setup");
e1.printStackTrace();
}
boolean pass = false;
String query = "select * from Registration;";
String DbUserName = "";
String DbPassword = "";
try {
dbConn = ds.getConnection();
Statement stat = dbConn.createStatement();
ResultSet rst = stat.executeQuery(query);
while (rst.next())
{
DbUserName = rst.getString("UserName");
DbPassword = rst.getString("password");
if (username2.equals(DbUserName)
&&
password2.equals(DbPassword)) {
pass = true;
break;
}
}
return pass;
} catch (SQLException e) {
System.out.println("Login:authenticate:");
e.printStackTrace();
return pass;
}
}
}
</code>
Full Stack Trace
<code>
INFO: Undeploying context [/AuthExample]
03-Mar-2009 13:24:12 org.apache.catalina.startup.HostConfig deployWAR
INFO: Deploying web application archive AuthExample.war
Login:authenticate:
org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of
class '' for connect URL 'null'
at
org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1150)
at
org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
at com.aricent.Login.authenticate(Login.java:29)
at org.apache.jsp.process2_jsp._jspService(process2_jsp.java:71)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.NullPointerException
at sun.jdbc.odbc.JdbcOdbcDriver.getProtocol(JdbcOdbcDriver.java:507)
at sun.jdbc.odbc.JdbcOdbcDriver.knownURL(JdbcOdbcDriver.java:476)
at sun.jdbc.odbc.JdbcOdbcDriver.acceptsURL(JdbcOdbcDriver.java:307)
at java.sql.DriverManager.getDriver(DriverManager.java:253)
at
org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1143)
... 21 more
</code>
I have deployed this without issue on a Windows XP laptop and read endless
mailing lists ....
ThanKs,
Paul
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