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