tomcat中部署jbpm异常

//部署完后：访问http://localhost:8080/jbpm-console/  出现异常
SEVERE: An exception or error occurred in the container during the request proce
ssing
java.lang.NoClassDefFoundError: org/apache/catalina/ServerFactory
        at org.jbpm.integration.tomcat6.JbpmConsoleRealm.openConnection(JbpmCons
oleRealm.java:176)
        at org.jbpm.integration.tomcat6.JbpmConsoleRealm.authenticate(JbpmConsol
eRealm.java:77)
...

[解决办法]
少了什么jar包了把