我在 IntelliJ 中使用 Maven 和 ZK 创建了一个 Web 应用程序。我有以下错误，让我非常头疼。它说我在 org.zkoss.common 中找不到 XMLResourceLocator 类。我的 POM 文件中确实有这个包的工件，但问题仍然存在。有人可以告诉我问题可能出在哪里吗？
SEVERE: Exception thrown by attributes event listener
java.lang.NoClassDefFoundError: org/zkoss/util/resource/XMLResourcesLocator
at org.zkoss.zk.ui.http.HttpSessionListener23.attributeAdded(HttpSessionListener23.java:87)
at org.apache.catalina.core.ApplicationContext.setAttribute(ApplicationContext.java:859)
at org.apache.catalina.core.ApplicationContextFacade.setAttribute(ApplicationContextFacade.java:400)
at org.springframework.web.context.support.WebApplicationContextUtils.registerWebApplicationScopes(WebApplicationContextUtils.java:153)
at org.springframework.web.context.support.AbstractRefreshableWebApplicationContext.postProcessBeanFactory(AbstractRefreshableWebApplicationContext.java:143)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:448)
at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:282)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:204)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4791)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5285)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:657)
at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1637)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:679)
Caused by: java.lang.ClassNotFoundException: org.zkoss.util.resource.XMLResourcesLocator
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
... 23 more
Apr 22, 2013 12:38:31 PM org.apache.catalina.core.ApplicationContext log
SEVERE: Exception thrown by attributes event listener
java.lang.NoClassDefFoundError: org/zkoss/util/resource/XMLResourcesLocator
at org.zkoss.zk.ui.http.HttpSessionListener23.attributeAdded(HttpSessionListener23.java:87)
at org.apache.catalina.core.ApplicationContext.setAttribute(ApplicationContext.java:859)
at org.apache.catalina.core.ApplicationContextFacade.setAttribute(ApplicationContextFacade.java:400)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:205)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4791)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5285)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:657)
at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1637)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:679)
Caused by: java.lang.ClassNotFoundException: org.zkoss.util.resource.XMLResourcesLocator
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
... 19 more
Apr 22, 2013 12:38:31 PM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Exception sending context initialized event to listener instance of class org.zkoss.zk.ui.http.HttpSessionListener
java.lang.NoClassDefFoundError: org/zkoss/util/resource/XMLResourcesLocator
at org.zkoss.zk.ui.http.HttpSessionListener23.contextInitialized(HttpSessionListener23.java:139)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4791)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5285)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:657)
at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1637)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:679)
Caused by: java.lang.ClassNotFoundException: org.zkoss.util.resource.XMLResourcesLocator
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
... 15 more
Apr 22, 2013 12:38:31 PM org.apache.catalina.core.ApplicationContext log
INFO: Closing Spring root WebApplicationContext
Apr 22, 2013 12:38:31 PM org.apache.catalina.core.ApplicationContext log
SEVERE: Exception thrown by attributes event listener
java.lang.NoClassDefFoundError: org/zkoss/util/resource/XMLResourcesLocator
at org.zkoss.zk.ui.http.HttpSessionListener23.attributeRemoved(HttpSessionListener23.java:96)
at org.apache.catalina.core.ApplicationContext.removeAttribute(ApplicationContext.java:782)
at org.apache.catalina.core.ApplicationContextFacade.removeAttribute(ApplicationContextFacade.java:410)
at org.springframework.web.context.ContextLoader.closeWebApplicationContext(ContextLoader.java:395)
at org.springframework.web.context.ContextLoaderListener.contextDestroyed(ContextLoaderListener.java:78)
at org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:4831)
at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5478)
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:160)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:657)
at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1637)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:679)
Caused by: java.lang.ClassNotFoundException: org.zkoss.util.resource.XMLResourcesLocator
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
... 20 more