java - 当我包含 java.lang.NoClassDefFoundError到 web.xml java

Question

拜托，我找不到这个错误的原因。

我创建了一个类 LogoutListener.java，它实现了 HttpSessionListener，它有两个抽象方法：sessionCreated 和 sessionDestroyed。我在 web.xml 中添加了相应的监听器标签：

...更多代码

<servlet>
    <servlet-name>Faces Servlet</servlet-name>
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>*.seam</url-pattern>
</servlet-mapping>

<!-- Listeners used by application -->

<listener>
     <listener-class>com.akson.encuesta.session.helper.LogoutListener</listener-class>
</listener>

<security-constraint>
    <display-name>Restrict raw XHTML Documents</display-name>
    <web-resource-collection>
        <web-resource-name>XHTML</web-resource-name>
        <url-pattern>*.xhtml</url-pattern>
    </web-resource-collection>
    <auth-constraint />
</security-constraint>

...更多代码

当我删除标签时，服务器不会出现错误，但是当标签在 web.xml 中时，服务器会出现错误（下一个是日志的一部分）：

    EjbSynchronizations/local - EJB3.x Default Local Business Interface
        EjbSynchronizations/local-org.jboss.seam.transaction.LocalEjbSynchroniza
tions - EJB3.x Local Business Interface

12:16:12,550 INFO  [SessionSpecContainer] Starting jboss.j2ee:jar=demoencuesta06
.war,name=TimerServiceDispatcher,service=EJB3
12:16:12,551 INFO  [EJBContainer] STARTED EJB: org.jboss.seam.async.TimerService
Dispatcher ejbName: TimerServiceDispatcher
12:16:12,557 INFO  [JndiSessionRegistrarBase] Binding the following Entries in G
lobal JNDI:

        TimerServiceDispatcher/local - EJB3.x Default Local Business Interface
        TimerServiceDispatcher/local-org.jboss.seam.async.LocalTimerServiceDispa
tcher - EJB3.x Local Business Interface

12:16:12,559 WARN  [TimerServiceContainer] EJBTHREE-2193: using deprecated Timer
ServiceFactory for restoring timers
12:16:12,763 INFO  [TomcatDeployment] deploy, ctxPath=/demoencuesta06
12:16:12,806 ERROR [[/demoencuesta06]] Error configurando escuchador de aplicaci
¾n de clase com.akson.encuesta.session.helper.LogoutListener: java.lang.ClassNot
FoundException: com.akson.encuesta.session.helper.LogoutListener
        at java.net.URLClassLoader$1.run(URLClassLoader.java:202) [:1.6.0_33]
        at java.security.AccessController.doPrivileged(Native Method) [:1.6.0_33
]
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190) [:1.6.0_33
]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306) [:1.6.0_33]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:247) [:1.6.0_33]
        at org.jboss.web.tomcat.service.TomcatInjectionContainer.newInstance(Tom
catInjectionContainer.java:278) [:6.1.0.Final]
        at org.jboss.web.tomcat.service.TomcatInjectionContainer.newInstance(Tom
catInjectionContainer.java:264) [:6.1.0.Final]
        at org.apache.catalina.core.StandardContext.contextListenerStart(Standar
dContext.java:3319) [:6.1.0.Final]
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:3
828) [:6.1.0.Final]
        at org.jboss.web.tomcat.service.deployers.TomcatDeployment.performDeploy
Internal(TomcatDeployment.java:294) [:6.1.0.Final]
        at org.jboss.web.tomcat.service.deployers.TomcatDeployment.performDeploy
(TomcatDeployment.java:146) [:6.1.0.Final]
        at org.jboss.web.deployers.AbstractWarDeployment.start(AbstractWarDeploy
ment.java:476) [:6.1.0.Final]
        at org.jboss.web.deployers.WebModule.startModule(WebModule.java:118) [:6
.1.0.Final]
        at org.jboss.web.deployers.WebModule.start(WebModule.java:95) [:6.1.0.Fi
nal]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [:1.6.0_3
3]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39) [:1.6.0_33]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25) [:1.6.0_33]
        at java.lang.reflect.Method.invoke(Method.java:597) [:1.6.0_33]
        at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatch
er.java:157) [:6.0.0.GA]
        at org.jboss.mx.server.Invocation.dispatch(Invocation.java:96) [:6.0.0.G
A]
        at org.jboss.mx.server.Invocation.invoke(Invocation.java:88) [:6.0.0.GA]

        at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.
java:271) [:6.0.0.GA]
        at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:670)
[:6.0.0.GA]
        at org.jboss.system.microcontainer.ServiceProxy.invoke(ServiceProxy.java
:206) [:2.2.0.SP2]
        at $Proxy41.start(Unknown Source)       at org.jboss.system.microcontain
er.StartStopLifecycleAction.installAction(StartStopLifecycleAction.java:53) [:2.
2.0.SP2]
        at org.jboss.system.microcontainer.StartStopLifecycleAction.installActio
n(StartStopLifecycleAction.java:41) [:2.2.0.SP2]
        at org.jboss.dependency.plugins.action.SimpleControllerContextAction.sim
pleInstallAction(SimpleControllerContextAction.java:62) [jboss-dependency.jar:2.
2.0.SP2]
        at org.jboss.dependency.plugins.action.AccessControllerContextAction.ins
tall(AccessControllerContextAction.java:71) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractControllerContextActions.install
(AbstractControllerContextActions.java:51) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractControllerContext.install(Abstra
ctControllerContext.java:379) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.system.microcontainer.ServiceControllerContext.install(Serv
iceControllerContext.java:301) [:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractController.install(AbstractContr
oller.java:2044) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractController.incrementState(Abstra
ctController.java:1083) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractController.executeOrIncrementSta
teDirectly(AbstractController.java:1322) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractController.resolveContexts(Abstr
actController.java:1246) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractController.resolveContexts(Abstr
actController.java:1139) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractController.change(AbstractContro
ller.java:939) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractController.change(AbstractContro
ller.java:654) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.system.ServiceController.doChange(ServiceController.java:67
1) [:6.1.0.Final (Build SVNTag:JBoss_6.1.0.Final date: 20110816)]
        at org.jboss.system.ServiceController.start(ServiceController.java:443)
[:6.1.0.Final (Build SVNTag:JBoss_6.1.0.Final date: 20110816)]
        at org.jboss.system.deployers.ServiceDeployer.start(ServiceDeployer.java
:189) [:6.1.0.Final]
        at org.jboss.system.deployers.ServiceDeployer.deploy(ServiceDeployer.jav
a:102) [:6.1.0.Final]
        at org.jboss.system.deployers.ServiceDeployer.deploy(ServiceDeployer.jav
a:49) [:6.1.0.Final]
        at org.jboss.deployers.spi.deployer.helpers.AbstractSimpleRealDeployer.i
nternalDeploy(AbstractSimpleRealDeployer.java:63) [:2.2.2.GA]
        at org.jboss.deployers.spi.deployer.helpers.AbstractRealDeployer.deploy(
AbstractRealDeployer.java:55) [:2.2.2.GA]
        at org.jboss.deployers.plugins.deployers.DeployerWrapper.deploy(Deployer
Wrapper.java:179) [:2.2.2.GA]
        at org.jboss.deployers.plugins.deployers.DeployersImpl.doDeploy(Deployer
sImpl.java:1832) [:2.2.2.GA]
        at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFi
rst(DeployersImpl.java:1550) [:2.2.2.GA]
        at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFi
rst(DeployersImpl.java:1571) [:2.2.2.GA]
        at org.jboss.deployers.plugins.deployers.DeployersImpl.install(Deployers
Impl.java:1491) [:2.2.2.GA]
        at org.jboss.dependency.plugins.AbstractControllerContext.install(Abstra
ctControllerContext.java:379) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractController.install(AbstractContr
oller.java:2044) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractController.incrementState(Abstra
ctController.java:1083) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractController.executeOrIncrementSta
teDirectly(AbstractController.java:1322) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractController.resolveContexts(Abstr
actController.java:1246) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractController.resolveContexts(Abstr
actController.java:1139) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractController.change(AbstractContro
ller.java:939) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractController.change(AbstractContro
ller.java:654) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.deployers.plugins.deployers.DeployersImpl.change(DeployersI
mpl.java:1983) [:2.2.2.GA]
        at org.jboss.deployers.plugins.deployers.DeployersImpl.process(Deployers
Impl.java:1076) [:2.2.2.GA]
        at org.jboss.deployers.plugins.main.MainDeployerImpl.process(MainDeploye
rImpl.java:679) [:2.2.2.GA]
        at org.jboss.system.server.profileservice.deployers.MainDeployerPlugin.p
rocess(MainDeployerPlugin.java:106) [:6.1.0.Final]
        at org.jboss.profileservice.dependency.ProfileControllerContext$Delegate
Deployer.process(ProfileControllerContext.java:143) [:0.2.2]
        at org.jboss.profileservice.dependency.ProfileDeployAction.deploy(Profil
eDeployAction.java:151) [:0.2.2]
        at org.jboss.profileservice.dependency.ProfileDeployAction.installAction
Internal(ProfileDeployAction.java:94) [:0.2.2]
        at org.jboss.kernel.plugins.dependency.InstallsAwareAction.installAction
(InstallsAwareAction.java:54) [jboss-kernel.jar:2.2.0.SP2]
        at org.jboss.kernel.plugins.dependency.InstallsAwareAction.installAction
(InstallsAwareAction.java:42) [jboss-kernel.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.action.SimpleControllerContextAction.sim
pleInstallAction(SimpleControllerContextAction.java:62) [jboss-dependency.jar:2.
2.0.SP2]
        at org.jboss.dependency.plugins.action.AccessControllerContextAction.ins
tall(AccessControllerContextAction.java:71) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractControllerContextActions.install
(AbstractControllerContextActions.java:51) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractControllerContext.install(Abstra
ctControllerContext.java:379) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractController.install(AbstractContr
oller.java:2044) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractController.incrementState(Abstra
ctController.java:1083) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractController.executeOrIncrementSta
teDirectly(AbstractController.java:1322) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractController.resolveContexts(Abstr
actController.java:1246) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractController.resolveContexts(Abstr
actController.java:1139) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractController.change(AbstractContro
ller.java:939) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.dependency.plugins.AbstractController.change(AbstractContro
ller.java:654) [jboss-dependency.jar:2.2.0.SP2]
        at org.jboss.profileservice.dependency.ProfileActivationWrapper$BasicPro
fileActivation.start(ProfileActivationWrapper.java:190) [:0.2.2]
        at org.jboss.profileservice.dependency.ProfileActivationWrapper.start(Pr
ofileActivationWrapper.java:87) [:0.2.2]
        at org.jboss.profileservice.dependency.ProfileActivationService.activate
Profile(ProfileActivationService.java:215) [:0.2.2]
        at org.jboss.profileservice.dependency.ProfileActivationService.activate
(ProfileActivationService.java:159) [:0.2.2]
        at org.jboss.profileservice.bootstrap.AbstractProfileServiceBootstrap.ac
tivate(AbstractProfileServiceBootstrap.java:112) [:0.2.2]
        at org.jboss.profileservice.resolver.BasicResolverFactory$ProfileResolve
rFacade.deploy(BasicResolverFactory.java:87) [:0.2.2]
        at org.jboss.profileservice.bootstrap.AbstractProfileServiceBootstrap.st
art(AbstractProfileServiceBootstrap.java:91) [:0.2.2]
        at org.jboss.system.server.profileservice.bootstrap.BasicProfileServiceB
ootstrap.start(BasicProfileServiceBootstrap.java:132) [:6.1.0.Final]
        at org.jboss.system.server.profileservice.bootstrap.BasicProfileServiceB
ootstrap.start(BasicProfileServiceBootstrap.java:56) [:6.1.0.Final]
        at org.jboss.bootstrap.impl.base.server.AbstractServer.startBootstraps(A
bstractServer.java:827) [jboss-bootstrap-impl-base.jar:2.1.0-alpha-6]
        at org.jboss.bootstrap.impl.base.server.AbstractServer$StartServerTask.r
un(AbstractServer.java:417) [jboss-bootstrap-impl-base.jar:2.1.0-alpha-6]
        at java.lang.Thread.run(Thread.java:662) [:1.6.0_33]

12:16:12,899 ERROR [[/demoencuesta06]] Se ha saltado la instalaci¾n de escuchado
res de aplicaci¾n debido a error(es) previo(s)
12:16:12,900 ERROR [StandardContext] Error listenerStart
12:16:12,900 ERROR [StandardContext] Fall¾ en arranque del Contexto [/demoencues
ta06] debido a errores previos
12:16:12,917 ERROR [AbstractKernelController] Error installing to Start: name=jb
oss.web.deployment:war=/demoencuesta06 state=Create mode=Manual requiredState=In
stalled: org.jboss.deployers.spi.DeploymentException: URL file:/D:/jboss-6.1.0.F
inal/server/default/deploy/demoencuesta06.war/ deployment failed
        at org.jboss.web.tomcat.service.deployers.TomcatDeployment.performDeploy
Internal(TomcatDeployment.java:325) [:6.1.0.Final]
        at org.jboss.web.tomcat.service.deployers.TomcatDeployment.performDeploy

我使用 Eclipse Indigo、Jboss、Seam、RichFaces

谢谢你

score 0 · Accepted Answer

出现此错误是因为您的类路径中没有类文件com.akson.encuesta.session.helper.LogoutListener。检查.jar项目中的 s 是否有此文件，如果没有，请添加它。

如果这是您项目中自己的类，请尝试在 Eclipse 中重新编译该项目。

score 0 · Accepted Answer

您需要确保它com.akson.encuesta.session.helper.LogoutListener位于应用程序的类路径中。

score 0 · Accepted Answer

AClassNotFoundException表示给定类的完全限定名称不是有效引用（简而言之：类加载器未找到该类）。您应该检查几件事：

你的项目中有这个类吗？
完全限定名称是否正确？（确保：右键单击>复制限定名称）
是否正确引用了正确的罐子？
构建路径中是否有任何错误？
如果您在作为库的 jar 中提供类，它是否正确添加到项目中？
如果你把所有东西都打包在一个 EAR 中，这个项目（模块）是它的一部分吗？您是否检查了部署程序集以确保正确加载罐子？是否为 EAR 中的每个模块提供了正确的共享库？

score 0 · Accepted Answer

您需要检查部署应用程序的部署目录。检查您的类是否存在于 WEB-INF/classes 中，或者至少存在于 WEB-INF/lib 文件夹中的任何 jar 中。如果您使用 eclipse WTP 插件来部署您的应用程序，您必须检查您的应用程序文件是否正确部署。有时运行时无法与项目输出文件正确同步。

java - 当我包含 java.lang.NoClassDefFoundError到 web.xml java

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