我在eclipse中有一个WTP项目，并将其部署为jetty 8.1.5中的WAR文件。在/WEB-INF/lib目录中，Web应用程序需要一些依赖项（jar）。当我部署WAR并启动服务器时，我得到了许多关于未找到的类的例外。这些课程可在/jetty-home/lib的码头罐中找到
如果我将这些码头放在网络应用程序的/WEB-INF/lib中，它可以正常工作，但据我所知它不应该这样做。可能是什么原因？
这是例外跟踪的示例：
java.lang.NoClassDefFoundError: org/eclipse/jetty/util/component/AbstractLifeCycle
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:415)
at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:377)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
at java.lang.Class.getDeclaredMethods(Unknown Source)
at org.eclipse.jetty.annotations.ResourceAnnotationHandler.doHandle(ResourceAnnotationHandler.java:58)
at org.eclipse.jetty.annotations.AnnotationIntrospector$AbstractIntrospectableAnnotationHandler.handle(AnnotationIntrospector.java:66)
at org.eclipse.jetty.annotations.AnnotationIntrospector.introspect(AnnotationIntrospector.java:91)
at org.eclipse.jetty.annotations.AnnotationDecorator.introspect(AnnotationDecorator.java:158)
at org.eclipse.jetty.annotations.AnnotationDecorator.decorateServletInstance(AnnotationDecorator.java:110)
at org.eclipse.jetty.servlet.ServletContextHandler$Context.createServlet(ServletContextHandler.java:1063)
at org.eclipse.jetty.servlet.ServletHolder.newInstance(ServletHolder.java:916)
at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:496)
at org.eclipse.jetty.servlet.ServletHolder.doStart(ServletHolder.java:326)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59)
at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:742)
at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:258)
at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1233)
at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:701)
at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:475)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59)
at org.eclipse.jetty.deploy.bindings.StandardStarter.processBinding(StandardStarter.java:36)
at org.eclipse.jetty.deploy.AppLifeCycle.runBindings(AppLifeCycle.java:183)
at org.eclipse.jetty.deploy.DeploymentManager.requestAppGoal(DeploymentManager.java:491)
at org.eclipse.jetty.deploy.DeploymentManager.addApp(DeploymentManager.java:138)
at org.eclipse.jetty.deploy.providers.ScanningAppProvider.fileAdded(ScanningAppProvider.java:142)
at org.eclipse.jetty.deploy.providers.ScanningAppProvider$1.fileAdded(ScanningAppProvider.java:53)
at org.eclipse.jetty.util.Scanner.reportAddition(Scanner.java:604)
at org.eclipse.jetty.util.Scanner.reportDifferences(Scanner.java:535)
at org.eclipse.jetty.util.Scanner.scan(Scanner.java:398)
at org.eclipse.jetty.util.Scanner.doStart(Scanner.java:332)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59)
at org.eclipse.jetty.deploy.providers.ScanningAppProvider.doStart(ScanningAppProvider.java:118)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59)
at org.eclipse.jetty.deploy.DeploymentManager.startAppProvider(DeploymentManager.java:552)
at org.eclipse.jetty.deploy.DeploymentManager.doStart(DeploymentManager.java:227)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59)
at org.eclipse.jetty.util.component.AggregateLifeCycle.doStart(AggregateLifeCycle.java:75)
at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:53)
at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:91)
at org.eclipse.jetty.server.Server.doStart(Server.java:272)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59)
at org.eclipse.jetty.xml.XmlConfiguration$1.run(XmlConfiguration.java:1260)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.jetty.xml.XmlConfiguration.main(XmlConfiguration.java:1183)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.jetty.start.Main.invokeMain(Main.java:462)
at org.eclipse.jetty.start.Main.start(Main.java:610)
at org.eclipse.jetty.start.Main.main(Main.java:86)
当我将我的网络应用程序部署到另一台计算机（服务器）时，我得到以下异常：
org.apache.jasper.el.ELContextImpl cannot be cast to org.apache.jasper.runtime.ElContextImpl
我认为它可能与我添加到/WEB-INF/lib的码头罐有关。