SEVERE：在啓動過程中，一個子容器失敗tomcat8

Question

我寫了一個簡單的sevlet程序。當我試圖在tomcat中部署相同的時候，我得到了下面的錯誤。

我嘗試刪除註釋。

SEVERE: A child container failed during start 
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/Trial]] 
at java.util.concurrent.FutureTask.report(Unknown Source) 
at java.util.concurrent.FutureTask.get(Unknown Source) 
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:916) 
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:868) 
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408) 
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398) 
at java.util.concurrent.FutureTask.run(Unknown Source) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
at java.lang.Thread.run(Unknown Source) 
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/Trial]] 
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) 
... 6 more 
Caused by: java.lang.IllegalArgumentException: Invalid <url-pattern> firstTest in servlet mapping 
at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3104) 
at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3079) 
at org.apache.catalina.startup.ContextConfig.configureContext(ContextConfig.java:1368) 
at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1172) 
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:767) 
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:302) 
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:5074) 
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
... 6 more 

Sep 19, 2014 9:51:45 PM org.apache.catalina.core.ContainerBase startInternal 
SEVERE: A child container failed during start 
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]] 
at java.util.concurrent.FutureTask.report(Unknown Source) 
at java.util.concurrent.FutureTask.get(Unknown Source) 
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:916) 
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) 
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:439) 
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:760) 
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
at org.apache.catalina.startup.Catalina.start(Catalina.java:625) 
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.apache.catalina.startup.Bootstrap.start(Bootstrap.java:351) 
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:485) 
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]] 
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) 
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408) 
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398) 
at java.util.concurrent.FutureTask.run(Unknown Source) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
at java.lang.Thread.run(Unknown Source) 
Caused by: org.apache.catalina.LifecycleException: A child container failed during start 
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:924) 
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:868) 
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
... 6 more 

Sep 19, 2014 9:51:45 PM org.apache.catalina.startup.Catalina start 
SEVERE: The required Server component failed to start so Tomcat is unable to start. 
org.apache.catalina.LifecycleException: Failed to start component [StandardServer[8005]] 
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) 
at org.apache.catalina.startup.Catalina.start(Catalina.java:625) 
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.apache.catalina.startup.Bootstrap.start(Bootstrap.java:351) 
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:485) 
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardService[Catalina]] 
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) 
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:760) 
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
... 7 more 
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina]] 
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) 
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:439) 
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
... 9 more 
Caused by: org.apache.catalina.LifecycleException: A child container failed during start 
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:924) 
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) 
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
... 11 more 

Sep 19, 2014 9:51:45 PM org.apache.coyote.AbstractProtocol pause 
INFO: Pausing ProtocolHandler ["http-nio-8080"] 
Sep 19, 2014 9:51:45 PM org.apache.coyote.AbstractProtocol pause 
INFO: Pausing ProtocolHandler ["ajp-nio-8009"] 
Sep 19, 2014 9:51:45 PM org.apache.catalina.core.StandardService stopInternal 
INFO: Stopping service Catalina 
Sep 19, 2014 9:51:45 PM org.apache.coyote.AbstractProtocol destroy 
INFO: Destroying ProtocolHandler ["http-nio-8080"] 
Sep 19, 2014 9:51:45 PM org.apache.coyote.AbstractProtocol destroy 
SEVERE: Failed to destroy end point associated with ProtocolHandler ["http-nio-8080"] 
java.lang.NullPointerException 
at org.apache.tomcat.util.net.NioEndpoint.releaseCaches(NioEndpoint.java:307) 
at org.apache.tomcat.util.net.NioEndpoint.unbind(NioEndpoint.java:482) 
at org.apache.tomcat.util.net.AbstractEndpoint.destroy(AbstractEndpoint.java:795) 
at org.apache.coyote.AbstractProtocol.destroy(AbstractProtocol.java:531) 
at org.apache.catalina.connector.Connector.destroyInternal(Connector.java:1023) 
at org.apache.catalina.util.LifecycleBase.destroy(LifecycleBase.java:305) 
at org.apache.catalina.core.StandardService.destroyInternal(StandardService.java:588) 
at org.apache.catalina.util.LifecycleBase.destroy(LifecycleBase.java:305) 
at org.apache.catalina.core.StandardServer.destroyInternal(StandardServer.java:850) 
at org.apache.catalina.util.LifecycleBase.destroy(LifecycleBase.java:305) 
at org.apache.catalina.startup.Catalina.start(Catalina.java:629) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
at sun.reflect.DelegatingMethodAcc 

servlet代碼在下面。服務器在沒有應用程序的情況下正常啓動

import java.io.IOException; 
import javax.servlet.ServletException; 
import javax.servlet.annotation.WebServlet; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 

/** 
* Servlet implementation class MyServlet 
*/ 

public class MyServlet extends HttpServlet { 
private static final long serialVersionUID = 1L; 

    /** 
    * Default constructor. 
    */ 
    public MyServlet() { 
     // TODO Auto-generated constructor stub 
    } 

/** 
    * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) 
    */ 
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
    // TODO Auto-generated method stub 
} 

/** 
    * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) 
    */ 
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
    // TODO Auto-generated method stub 
} 

} 

Answer 1

您是否在嵌套堆棧跟蹤中看到此消息？

Caused by: java.lang.IllegalArgumentException: 
    Invalid <url-pattern> firstTest in servlet mapping 

它似乎是說你的web.xml中有一個servlet-mapping元素，它具有無效的url模式。在該文件中查找問題。

Answer 2

網址格式錯誤。檢查xml文件