我在Ubuntu 13.04上在jetty中运行servlet时遇到了问题。 服务器使用apt-get安装，并开始使用sudo service jetty start 。 该应用程序需要类org.eclipse.jetty.util.component.AbstractLifeCycle但我得到一个类未find错误。 这是堆栈跟踪：
java.lang.NoClassDefFoundError: org/eclipse/jetty/util/component/AbstractLifeCycle at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:788) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:447) at java.net.URLClassLoader.access$100(URLClassLoader.java:71) at java.net.URLClassLoader$1.run(URLClassLoader.java:361) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:420) at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:382) at org.cometd.server.CometdServlet.newBayeuxServer(CometdServlet.java:130) at org.cometd.server.CometdServlet.init(CometdServlet.java:64) at org.cometd.annotation.AnnotationCometdServlet.init(AnnotationCometdServlet.java:54) at javax.servlet.GenericServlet.init(GenericServlet.java:244) at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:542) at org.eclipse.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:424) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:671) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:505) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:138) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:564) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:213) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1094) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:432) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:175) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1028) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:136) at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:258) at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:109) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97) at org.eclipse.jetty.server.Server.handle(Server.java:445) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:267) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:224) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.run(AbstractConnection.java:358) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:601) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:532) at java.lang.Thread.run(Thread.java:724) Caused by: java.lang.ClassNotFoundException: org.eclipse.jetty.util.component.AbstractLifeCycle at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:420) at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:382) ... 37 more Caused by: java.lang.ClassNotFoundException: org.eclipse.jetty.util.component.AbstractLifeCycle at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:420) at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:382) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:788) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:447) at java.net.URLClassLoader.access$100(URLClassLoader.java:71) at java.net.URLClassLoader$1.run(URLClassLoader.java:361) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:420) at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:382) at org.cometd.server.CometdServlet.newBayeuxServer(CometdServlet.java:130) at org.cometd.server.CometdServlet.init(CometdServlet.java:64) at org.cometd.annotation.AnnotationCometdServlet.init(AnnotationCometdServlet.java:54) at javax.servlet.GenericServlet.init(GenericServlet.java:244) at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:542) at org.eclipse.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:424) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:671) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:505) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:138) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:564) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:213) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1094) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:432) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:175) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1028) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:136) at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:258) at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:109) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97) at org.eclipse.jetty.server.Server.handle(Server.java:445) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:267) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:224) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.run(AbstractConnection.java:358) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:601) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:532) at java.lang.Thread.run(Thread.java:724)
到目前为止我有：
1）检查用于启动jetty的命令以使用ps查找类path：
/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java -Djetty.home=/opt/jetty -Dovc.db_config=/home/ubuntu/ovc/data/ovc-repo/config/sql.properties -Dovc.repo_loc=/home/ubuntu/ovc/data/ovc-repo -cp /opt/jetty/lib/jetty-xml-9.0.4.v20130625.jar:/opt/jetty/lib/servlet-api-3.0.jar:/opt/jetty/lib/jetty-http-9.0.4.v20130625.jar:/opt/jetty/lib/jetty-continuation-9.0.4.v20130625.jar:/opt/jetty/lib/jetty-server-9.0.4.v20130625.jar:/opt/jetty/lib/jetty-security-9.0.4.v20130625.jar:/opt/jetty/lib/jetty-servlet-9.0.4.v20130625.jar:/opt/jetty/lib/jetty-webapp-9.0.4.v20130625.jar:/opt/jetty/lib/jetty-deploy-9.0.4.v20130625.jar:/opt/jetty/lib/jetty-jmx-9.0.4.v20130625.jar:/opt/jetty/lib/jsp/com.sun.el-2.2.0.v201303151357.jar:/opt/jetty/lib/jsp/javax.el-2.2.0.v201303151357.jar:/opt/jetty/lib/jsp/javax.servlet.jsp.jstl-1.2.0.v201105211821.jar:/opt/jetty/lib/jsp/javax.servlet.jsp-2.2.0.v201112011158.jar:/opt/jetty/lib/jsp/org.apache.jasper.glassfish-2.2.2.v201112011158.jar:/opt/jetty/lib/jsp/org.apache.taglibs.standard.glassfish-1.2.0.v201112081803.jar:/opt/jetty/lib/jsp/org.eclipse.jdt.core-3.8.2.v20130121.jar:/opt/jetty/resources:/opt/jetty/lib/websocket/websocket-api-9.0.4.v20130625.jar:/opt/jetty/lib/websocket/websocket-client-9.0.4.v20130625.jar:/opt/jetty/lib/websocket/websocket-common-9.0.4.v20130625.jar:/opt/jetty/lib/websocket/websocket-server-9.0.4.v20130625.jar:/opt/jetty/lib/websocket/websocket-servlet-9.0.4.v20130625.jar:/opt/jetty/lib/jetty-util-9.0.4.v20130625.jar:/opt/jetty/lib/jetty-io-9.0.4.v20130625.jar org.eclipse.jetty.xml.XmlConfiguration /tmp/start2620351902332669076.properties /opt/jetty/etc/jetty.xml /opt/jetty/etc/jetty-jmx.xml /opt/jetty/etc/jetty-http.xml /opt/jetty/etc/jetty-deploy.xml /opt/jetty/etc/jetty-logging.xml /opt/jetty/etc/jetty-started.xml
2）检查应该包含缺less的类的jar：
~$ jar -tf /opt/jetty/lib/jetty-util-9.0.4.v20130625.jar | grep AbstractLife org/eclipse/jetty/util/component/AbstractLifeCycle$AbstractLifeCycleListener.class org/eclipse/jetty/util/component/AbstractLifeCycle.class
任何人都可以提出一个关于接下来要检查什么的build议，我没有想法？ 谢谢。
把jetty-util-9.0.4.v20130625.jar放到你的webapp的WEB-INF/lib/
从stacktrace中可以看到，您正尝试使用webapp中的jetty-util中找到的类。
at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:420)
这告诉你， Web应用程序需要jetty-util的类。
由于web应用程序类加载器的隔离以及Jetty中的各种规则 ， org.eclipse.jetty.util.*的类不是由服务器提供的，必须由webapp自己的WEB-INF/lib目录提供。
在你的webapps/YOURWAR.xml ，在<Configure class="org.eclipse.jetty.webapp.WebAppContext"> （在org.eclipse.jetty.util.前面-很重要）：
<Call name="prependserverClass"> <Arg>-org.eclipse.jetty.util.</Arg> </Call>
您需要预先安排它，因为顺序很重要，默认添加的最后一个是org.eclipse.jetty. 如eclipse.org上记录的那样 。 所以调用addserverClass将是一个no-op，作为org.eclipse.jetty.util. 已经被org.eclipse.jetty.排除了org.eclipse.jetty. 。
Joakim Erdfelt指出，如果有人需要一段pom代码，就把它放在pom文件中：
<dependency> <groupId>org.eclipse.jetty</groupId> <artifactId>jetty-util</artifactId> <version>9.3.6.v20151106</version> </dependency>
在部署环境中，只要确保你的服务器classpath包含了Spring jar库（例如spring-2.5.6.jar）。
对于Spring3，ContextLoaderlistner被移动到spring-web.jar，你可以从Maven中央仓库获取库。
<dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>3.0.5.RELEASE</version> </dependency>