Root exception is java.lang.ClassNotFoundException: org.apache.commons.dbcp.BasicDataSourceFactory: 

according to this : http://mail-archives.apache.org/mod_mbox/tomcat-users/200903.mbox/%3Ca2d59f0d0903031254h78e097b5u66cb2639f82166dd@mail.gmail.com%3E

there is a problem in context.xml : 


Feb 14, 2012 12:42:54 PM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: .:/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java
Feb 14, 2012 12:42:54 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'debug' to '5' did not find a matching property.
Feb 14, 2012 12:42:54 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.j2ee.server:molgenis_apps' did not find a matching property.
Feb 14, 2012 12:42:54 PM org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on http-8080
Feb 14, 2012 12:42:54 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 1113 ms
Feb 14, 2012 12:42:54 PM org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
Feb 14, 2012 12:42:54 PM org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/6.0.26
Feb 14, 2012 12:42:55 PM org.apache.catalina.loader.WebappClassLoader validateJarFile
INFO: validateJarFile(/Users/despoina/Documents/molgenis_apps/.metadata/.plugins/org.eclipse.wst.server.core/tmp10/wtpwebapps/molgenis_apps/WEB-INF/lib/selenium-server-standalone-2.2.0.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
Feb 14, 2012 12:42:55 PM org.apache.catalina.core.NamingContextListener addResource
WARNING: Failed to register in JMX: javax.naming.NamingException: Could not load resource factory class [Root exception is java.lang.ClassNotFoundException: org.apache.commons.dbcp.BasicDataSourceFactory]
Feb 14, 2012 12:42:55 PM org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on http-8080
Feb 14, 2012 12:42:55 PM org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
Feb 14, 2012 12:42:55 PM org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/68  config=null
Feb 14, 2012 12:42:55 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 766 ms