我将我的文件夹（myApp）复制到Tomcat8的webapps文件夹中。
然后我去了＃34; Tomcat Web应用程序管理器＆＃34; ＆安培;我看到＆＃34; / myApp＆＃34;在那里跑=假。然后我点击了Start＆amp;发现了这个错误：
FAIL - Application at context path /myApp could not be started
FAIL - Encountered exception org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/myApp]]
在此之前，Youtube中的一个人指示修改tomcat8 / conf / tomcat-users.xml，如下所示：
<?xml version='1.0' encoding='utf-8'?>
<tomcat-users>
<role rolename="manager-gui"/>
<role rolename="manager-script"/>
<role rolename="manager-jmx"/>
<role rolename="manager-status"/>
<role rolename="admin"/>
<user username="admin" password="admin" roles="admin,manager-gui,manager-script"/>
</tomcat-users>
所以我不确定问题是tomcat-users.xml文件中的配置是否为cos。
注意：这是myApp的web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
version="2.5">
<display-name>myApp</display-name>
<!-- Default page to serve -->
<welcome-file-list>
<welcome-file>myApp.html</welcome-file>
</welcome-file-list>
<listener>
<listener-class>myApp.server.guice.GuiceServletConfig</listener-class>
</listener>
<filter>
<filter-name>guiceFilter</filter-name>
<filter-class>com.google.inject.servlet.GuiceFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>guiceFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<context-param>
<!-- max size of the upload request -->
<param-name>maxSize</param-name>
<param-value>5145728</param-value>
</context-param>
<context-param>
<param-name>slowUploads</param-name>
<param-value>200</param-value>
</context-param>
<servlet>
<servlet-name>uploadServlet</servlet-name>
<!-- This is the default servlet, it puts files in session -->
<servlet-class>myApp.server.SampleUploadServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>uploadServlet</servlet-name>
<url-pattern>*.gupld</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>SimpleCaptcha</servlet-name>
<servlet-class>
myApp.server.ExtendedCaptchaServlet
</servlet-class>
<init-param>
<param-name>width</param-name>
<param-value>200</param-value>
</init-param>
<init-param>
<param-name>height</param-name>
<param-value>50</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>SimpleCaptcha</servlet-name>
<url-pattern>/SimpleCaptcha.jpg</url-pattern>
</servlet-mapping>
</web-app>
Catalina.2014-05-09.log：
09-May-2014 04:52:27.290 SEVERE [localhost-startStop-1] org.apache.catalina.core.ContainerBase.addChildInternal ContainerBase.addChild: start:
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/myApp]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:726)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:702)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:697)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1134)
at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1780)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.LinkageError: loader constraint violation in interface itable initialization: when resolving method "javax.servlet.http.HttpServlet.service(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V" the class loader (instance of java/net/URLClassLoader) of the current class, gwtupload/server/UploadServlet, and the class loader (instance of org/apache/catalina/loader/WebappClassLoader) for interface javax/servlet/Servlet have different Class objects for the type let/ServletResponse;)V used in the signature
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Class.java:2397)
at java.lang.Class.getDeclaredFields(Class.java:1806)
at org.apache.catalina.util.Introspection.getDeclaredFields(Introspection.java:106)
at org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:261)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:140)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:66)
at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:332)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:771)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:303)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5058)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 10 more
09-May-2014 04:52:27.305 SEVERE [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Error deploying web application directory C:\tomcat8\webapps\myApp
java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/myApp]]
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:729)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:702)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:697)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1134)
at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1780)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
09-May-2014 04:52:27.321 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory C:\tomcat8\webapps\examples
09-May-2014 04:52:28.102 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory C:\tomcat8\webapps\host-manager
09-May-2014 04:52:28.133 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory C:\tomcat8\webapps\manager
09-May-2014 04:52:28.274 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory C:\tomcat8\webapps\ROOT
09-May-2014 04:52:28.336 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["http-nio-8080"]
09-May-2014 04:52:28.336 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["ajp-nio-8009"]
09-May-2014 04:52:28.336 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in 13386 ms
答案 0 :(得分：0)
您的应用程序似乎包含与Tomcat不同的servlet API。检查你的apps lib文件夹中是否有servlet-api.jar并尝试将其删除。如果您使用Maven将servlet-api.jar的依赖范围设置为＆＃34;提供＆＃34;。