我在tomcat（jdk 7）上部署我的war文件，并看到以下错误。不知道是什么原因引起的问题。

INFO: OpenSSL successfully initialized (OpenSSL 1.0.1d 5 Feb 2013)
Feb 27, 2014 11:02:50 AM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-apr-8081"]
Feb 27, 2014 11:02:50 AM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-apr-8009"]
Feb 27, 2014 11:02:50 AM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 1588 ms
Feb 27, 2014 11:02:50 AM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Feb 27, 2014 11:02:50 AM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.42
Feb 27, 2014 11:02:50 AM org.apache.catalina.startup.HostConfig deployWAR
INFO: Deploying web application archive D:\Dev\tools\apache-tomcat-7.0.42\webapp
s\CollaborationPortal.war
Feb 27, 2014 11:03:09 AM org.apache.catalina.startup.TaglibUriRule body
INFO: TLD skipped. URI: http://java.sun.com/jsp/jstl/core is already defined
Feb 27, 2014 11:03:09 AM org.apache.catalina.startup.TaglibUriRule body
INFO: TLD skipped. URI: http://java.sun.com/jsp/jstl/fmt is already defined
Feb 27, 2014 11:03:09 AM org.apache.catalina.core.StandardContext startInternal
SEVERE: Error listenerStart
Feb 27, 2014 11:03:09 AM org.apache.catalina.core.StandardContext startInternal
SEVERE: Context [/CollaborationPortal] startup failed due to previous errors
Feb 27, 2014 11:03:09 AM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-apr-8081"]
Feb 27, 2014 11:03:09 AM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-apr-8009"]
Feb 27, 2014 11:03:09 AM org.apache.catalina.startup.Catalina start
INFO: Server startup in 18890 ms