好的，所以我得到了一个间歇性的例外，我似乎无法弄明白，我似乎无法一致地重现它以找出问题。我所拥有的只是一个例外和一个堆栈跟踪，也许你们可以帮助我。我可以告诉你，我在浏览我的网页应用程序时，从一个页面导航到另一个页面，然后返回，等等，这样才能看到我的所有前锋都正常工作，而且所有的jstl标签都正确加载了正确的信息。堆栈跟踪是这样的：
java.lang.IllegalStateException: The resources may not be accessed if they are not currently started
at org.apache.catalina.webresources.StandardRoot.validate(StandardRoot.java:232)
at org.apache.catalina.webresources.StandardRoot.getResource(StandardRoot.java:199)
at org.apache.catalina.webresources.StandardRoot.getResource(StandardRoot.java:193)
at org.apache.catalina.mapper.Mapper.internalMapWrapper(Mapper.java:990)
at org.apache.catalina.mapper.Mapper.internalMap(Mapper.java:808)
at org.apache.catalina.mapper.Mapper.map(Mapper.java:667)
at org.apache.catalina.connector.CoyoteAdapter.postParseRequest(CoyoteAdapter.java:862)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:521)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:655)
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1566)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1523)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
任何想法