Resin出现这个错误是怎么回事啊?
500 Servlet Exception
java.lang.NoClassDefFoundError: org/apache/commons/collections/ArrayStack
at org.apache.commons.digester.Digester.<init>(Digester.java:185)
at org.apache.struts.action.ActionServlet.initServlet(ActionServlet.java:1405)
at org.apache.struts.action.ActionServlet.init(ActionServlet.java:466)
at javax.servlet.GenericServlet.init(GenericServlet.java:82)
at com.caucho.server.dispatch.ServletConfigImpl.createServlet(ServletConfigImpl.java:566)
at com.caucho.server.dispatch.ServletManager.init(ServletManager.java:153)
at com.caucho.server.webapp.Application.start(Application.java:1535)
at com.caucho.server.deploy.Entry.startImpl(Entry.java:469)
at com.caucho.server.webapp.WebAppEntry.startImpl(WebAppEntry.java:94)
at com.caucho.server.deploy.Entry.redeployIfModifiedImpl(Entry.java:428)
at com.caucho.server.webapp.WebAppEntry.redeployIfModifiedImpl(WebAppEntry.java:94)
at com.caucho.server.deploy.Entry.startAutomatic(Entry.java:380)
at com.caucho.server.deploy.DeployContainer.start(DeployContainer.java:159)
at com.caucho.server.webapp.ApplicationContainer.start(ApplicationContainer.java:562)
at com.caucho.server.host.Host.start(Host.java:496)
at com.caucho.server.deploy.Entry.startImpl(Entry.java:469)
at com.caucho.server.host.HostEntry.startImpl(HostEntry.java:95)
at com.caucho.server.deploy.Entry.redeployIfModifiedImpl(Entry.java:428)
at com.caucho.server.host.HostEntry.redeployIfModifiedImpl(HostEntry.java:95)
at com.caucho.server.deploy.Entry.startAutomatic(Entry.java:380)
at com.caucho.server.deploy.DeployContainer.start(DeployContainer.java:159)
at com.caucho.server.host.HostContainer.start(HostContainer.java:475)
at com.caucho.server.resin.ServletServer.start(ServletServer.java:792)
at com.caucho.server.resin.ResinServer.start(ResinServer.java:430)
at com.caucho.server.resin.Resin.init(Resin.java:279)
at com.caucho.server.resin.Resin.main(Resin.java:474)
--------------------------------------------------------------------------------
Resin-3.0.8 (built Tue, 08 Jun 2004 02:25:40 PDT)