尝试发布Struts2动态Web应用程序时Tomcat java.lang.NoClassDefFoundError：javax / servlet / Filter

时间：2013-11-28 19:09:19

标签： eclipse macos tomcat struts2

我见过人们问了一个类似的问题，但不完全一样，我看到的建议的解决方案对我来说并没有真正起作用。

我当前的问题 只要发布了Struts 2 Web应用程序，我的tomcat就打印出包含异常的以下日志消息。 我可以为localhost加载正确的页面：8080但不是web应用程序，即使war文件夹已经放在Tomcat的webapps文件夹中。

我想这与servlet-api.jar有关，但我确保jar在Tomcat lib文件夹中，并且我的Eclipse Tomcat服务器指向了Tomcat文件夹。

我正在使用Mac OSX，我也确信我的env变量已经到位。通过在终端中键入export，我可以看到CATALINA_BASE，CATALINA_HOME，CLASSPATH等的值。

所以我需要帮助..

服务器消息：

Nov 28, 2013 1:59:57 PM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: .:/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java
Nov 28, 2013 1:59:57 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:HellowWorldStruts2' did not find a matching property.
Nov 28, 2013 1:59:58 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
Nov 28, 2013 1:59:58 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
Nov 28, 2013 1:59:58 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 659 ms
Nov 28, 2013 1:59:58 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Nov 28, 2013 1:59:58 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.47
Nov 28, 2013 2:00:01 PM org.apache.tomcat.websocket.server.WsSci onStartup
INFO: JSR 356 WebSocket (Java WebSocket 1.0) support is not available when running on Java 6. To suppress this message, run Tomcat on Java 7, remove the WebSocket JARs from $CATALINA_HOME/lib or add the WebSocketJARs to the tomcat.util.scan.DefaultJarScanner.jarsToSkip property in $CATALINA_BASE/conf/catalina.properties. Note that the deprecated Tomcat 7 WebSocket API will be available. 
Nov 28, 2013 2:00:01 PM org.apache.catalina.core.StandardContext filterStart
SEVERE: Exception starting filter struts2
java.lang.NoClassDefFoundError: javax/servlet/Filter
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
    at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at sun.misc.Launcher$ExtClassLoader.findClass(Launcher.java:229)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:295)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1617)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547)
    at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:532)
    at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:514)
    at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:142)
    at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:260)
    at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:107)
    at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4775)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5452)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:680)
Caused by: java.lang.ClassNotFoundException: javax.servlet.Filter
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at sun.misc.Launcher$ExtClassLoader.findClass(Launcher.java:229)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    ... 31 more
Nov 28, 2013 2:00:01 PM org.apache.catalina.core.StandardContext startInternal
SEVERE: Error filterStart
Nov 28, 2013 2:00:01 PM org.apache.catalina.core.StandardContext startInternal
SEVERE: Context [/HellowWorldStruts2] startup failed due to previous errors
Nov 28, 2013 2:00:01 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory /usr/local/apache-tomcat-7.0.47/webapps/docs
Nov 28, 2013 2:00:01 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory /usr/local/apache-tomcat-7.0.47/webapps/examples
Nov 28, 2013 2:00:02 PM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextInitialized()
Nov 28, 2013 2:00:02 PM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextInitialized()
Nov 28, 2013 2:00:02 PM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: attributeAdded('org.apache.jasper.compiler.TldLocationsCache', 'org.apache.jasper.compiler.TldLocationsCache@37e80c87')
Nov 28, 2013 2:00:02 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory /usr/local/apache-tomcat-7.0.47/webapps/host-manager
Nov 28, 2013 2:00:02 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory /usr/local/apache-tomcat-7.0.47/webapps/manager
Nov 28, 2013 2:00:02 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory /usr/local/apache-tomcat-7.0.47/webapps/ROOT
Nov 28, 2013 2:00:02 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
Nov 28, 2013 2:00:02 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
Nov 28, 2013 2:00:02 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 4323 ms

解决方案：我发现我将整个Struts2 jar库复制到我的/ Library / Java / Extensions文件夹中。我删除所有这些罐子，这个错误消失了（新错误..）

2 个答案:

答案 0 :(得分：1)

在tomcat上的

NoClassDefFoundError就像这一个几乎总是servlet-api.jar版本冲突的结果 - 通常在你的 WEB-INF \ lib 和Tomcat的 lib 文件夹。

通过在构建工具中设置适当的范围，确保 WEB-INF \ lib 中没有servlet-api.jar（例如，provided在Maven或Gradle中的providedRuntime或providedCompile。

答案 1 :(得分：0)

在pom.xml中添加：

<dependency>
  <groupId>javax.servlet</groupId>
  <artifactId>javax.servlet-api</artifactId>
  <version>3.0.1</version>
  <scope>provided</scope>
</dependency>
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