I am trying to install DBCP and mm.mysql 2.0.14 (JDBC Driver) and a test app to see if it works.
I'm not sure I have all the correct steps and configuration, in other words I don't know what I am doing.. Here is what I know and my setup for this test example that I keep getting a class compile error on.

This is the error reported by browser -

type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 7 in the jsp file: /test.jsp
Generated servlet error:
foo.DBTest cannot be resolved to a type
An error occurred at line: 7 in the jsp file: /test.jsp
Generated servlet error:
foo.DBTest cannot be resolved to a type
org.apache.jasper.servlet.JspServletWrapper.handleJspException (JspServletWrapper.java:512)
org.apache.jasper.servlet.JspServletWrapper.service (JspServletWrapper.java:377)
org.apache.jasper.servlet.JspServlet.serviceJspFile (JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service (JspServlet.java:264)
javax.servlet.http.HttpServlet.service (HttpServlet.java:802)
root cause
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 7 in the jsp file: /test.jsp
Generated servlet error:
foo.DBTest cannot be resolved to a type
An error occurred at line: 7 in the jsp file: /test.jsp
Generated servlet error:
foo.DBTest cannot be resolved to a type
org.apache.jasper.compiler.DefaultErrorHandler.javacError (DefaultErrorHandler.java:84)
org.apache.jasper.compiler.ErrorDispatcher.javacError (ErrorDispatcher.java:328)
org.apache.jasper.compiler.JDTCompiler.generateClass (JDTCompiler.java:414)
org.apache.jasper.compiler.Compiler.compile (Compiler.java:297)
org.apache.jasper.compiler.Compiler.compile (Compiler.java:276)
org.apache.jasper.compiler.Compiler.compile (Compiler.java:264)
org.apache.jasper.JspCompilationContext.compile (JspCompilationContext.java:563)
org.apache.jasper.servlet.JspServletWrapper.service (JspServletWrapper.java:305)
org.apache.jasper.servlet.JspServlet.serviceJspFile (JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service (JspServlet.java:264)
javax.servlet.http.HttpServlet.service (HttpServlet.java:802)

This is the Tomcat log -

Mar 5, 2007 12:13:30 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet jsp threw exception
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 7 in the jsp file: /test.jsp
Generated servlet error:
foo.DBTest cannot be resolved to a type
An error occurred at line: 7 in the jsp file: /test.jsp
Generated servlet error:
foo.DBTest cannot be resolved to a type
at org.apache.jasper.compiler.DefaultErrorHandler.javacError (DefaultErrorHandler.java:84)
at org.apache.jasper.compiler.ErrorDispatcher.javacError (ErrorDispatcher.java:328)
at org.apache.jasper.compiler.JDTCompiler.generateClass (JDTCompiler.java:414)
at org.apache.jasper.compiler.Compiler.compile (Compiler.java:297)
at org.apache.jasper.compiler.Compiler.compile (Compiler.java:276)
at org.apache.jasper.compiler.Compiler.compile (Compiler.java:264)
at org.apache.jasper.JspCompilationContext.compile (JspCompilationContext.java:563)
at org.apache.jasper.servlet.JspServletWrapper.service (JspServletWrapper.java:305)
at org.apache.jasper.servlet.JspServlet.serviceJspFile (JspServlet.java:314)
at org.apache.jasper.servlet.JspServlet.service (JspServlet.java:264)
at javax.servlet.http.HttpServlet.service (HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter (ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke (StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke (StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke (StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke (StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service (CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process (Http11Processor.java:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket (PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt (LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Unknown Source)

This is how I setup and config for the DBCP and mm.mysql 2.0.14 (JDBC Driver)

Added to \www\tomcat5\common\lib
  commons-pool-1.3.jar
  commons-collections-3.2.jar
  commons-dbcp-1.2.1.jar



<Context path="/DBTest" docBase="DBTest"
 debug="5" reloadable="true" crossContext="true">
<Logger className="org.apache.catalina.logger.FileLogger"
    prefix="localhost_DBTest_log." suffix=".txt"
    timestamp="true"/>
<Resource name="jdbc/TestDB"
    auth="Container"
    type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/TestDB">
  <parameter>
    <name>factory</name>
    <value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
  </parameter>
  <parameter>
    <name>maxActive</name>
    <value>100</value>
  </parameter>
  <parameter>
    <name>maxIdle</name>
    <value>30</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>
The example I was following wasn't clear about if these next three went here or not
<parameter>
   <name>removeAbandoned</name>
   <value>true</value>
  </parameter>
  <parameter>
   <name>removeAbandonedTimeout</name>
   <value>60</value>
  </parameter>
  <parameter>
   <name>logAbandoned</name>
   <value>true</value>
  </parameter>
</ResourceParams>
</Context>