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在前几讲中，我都是使用tomcat7插件来运行maven项目的，这只需要我们在pom.xml文件中添加tomcat7插件的依赖即可。

我靠！这个tomcat7插件是不是有点太老了，因为我本地tomcat服务器使用的都是apache-tomcat-8.5.38这个版本了。我不禁就想了，何不在maven中安装tomcat8-maven-plugin插件，并使用它来运行maven项目呢？

你不禁想问了，如何找到这样一个tomcat8-maven-plugin插件的坐标呢？首先，打开浏览器，访问这样一个url地址，这时你就可以看到所有版本的tomcat8-maven-plugin插件了。

这里，我们不妨选择3.0-r1655215这个版本的tomcat8-maven-plugin插件。点击3.0-r1655215，就能看到这个版本的tomcat8-maven-plugin插件的坐标了。 如果把上面的依赖加入到pom.xml文件中，那么要么就是提示找不到该依赖，要么就是下载不下来。我找了半天终于找到了一个解决方法，那就是使用maven中的<pluginRepositories>标签（该标签是用来配置插件地址的）。因为maven中的所有功能都是使用插件来实现的，所以需要从特定的地址下载插件包。

于是，首先要在pom.xml文件中加入如下内容：

   
       
            
     
      alfresco-public
             
     
      https://artifacts.alfresco.com/nexus/content/groups/public
         
        
            
     
      alfresco-public-snapshots
             
     
      https://artifacts.alfresco.com/nexus/content/groups/public-snapshots
             
                 
      
       true
                  
      
       daily
              
         
        
            
     
      beardedgeeks-releases
             
     
      http://beardedgeeks.googlecode.com/svn/repository/releases
         
    
   

然后，再在pom.xml文件中加入tomcat8-maven-plugin插件的依赖。

   
       
    
     org.apache.tomcat.maven
        
    
     tomcat8-maven-plugin
        
    
     3.0-r1655215
        
            
     
      tomcat8
             
             
     
      8080
             
             
     
      /hellomaven
             
             
     
      utf-8
         
    
   

接下来，就要使用tomcat8-maven-plugin插件来运行maven项目了，大家可以按照下图所示的步骤进行操作。

然后，在弹出的窗口中输入tomcat8:run命令，点击Run即可运行maven项目了。 这时，eclipse控制台打印出了如下内容。 从中可以发现使用maven里面带有的tomcat8插件来运行maven项目已经运行成功了。紧接着，打开Google Chrome浏览器，并访问http://localhost:8080/hellomaven/HelloServlet这样一个url地址，发现报错了，错误提示信息如下： 而且，eclipse控制台也打印出了如下错误提示信息：

严重: Servlet.service() for servlet jsp threw exceptionjava.lang.LinkageError: loader constraint violation: when resolving method "org.apache.jasper.runtime.InstanceManagerFactory.getInstanceManager(Ljavax/servlet/ServletConfig;)Lorg/apache/tomcat/InstanceManager;" the class loader (instance of org/apache/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/index_jsp, and the class loader (instance of org/codehaus/plexus/classworlds/realm/ClassRealm) for the method's defining class, org/apache/jasper/runtime/InstanceManagerFactory, have different Class objects for the type org/apache/tomcat/InstanceManager used in the signature	at org.apache.jsp.index_jsp._jspInit(index_jsp.java:32)	at org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:49)	at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:180)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:721)	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:466)	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:391)	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:318)	at com.meimeixia.web.HelloServlet.doGet(HelloServlet.java:13)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:618)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537)	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1081)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658)	at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222)	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1566)	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1523)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)	at java.lang.Thread.run(Unknown Source)十二月 21, 2019 9:13:01 下午 org.apache.catalina.core.StandardWrapperValve invoke严重: Servlet.service() for servlet [HelloServlet] in context with path [/hellomaven] threw exception [java.lang.LinkageError: loader constraint violation: when resolving method "org.apache.jasper.runtime.InstanceManagerFactory.getInstanceManager(Ljavax/servlet/ServletConfig;)Lorg/apache/tomcat/InstanceManager;" the class loader (instance of org/apache/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/index_jsp, and the class loader (instance of org/codehaus/plexus/classworlds/realm/ClassRealm) for the method's defining class, org/apache/jasper/runtime/InstanceManagerFactory, have different Class objects for the type org/apache/tomcat/InstanceManager used in the signature] with root causejava.lang.LinkageError: loader constraint violation: when resolving method "org.apache.jasper.runtime.InstanceManagerFactory.getInstanceManager(Ljavax/servlet/ServletConfig;)Lorg/apache/tomcat/InstanceManager;" the class loader (instance of org/apache/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/index_jsp, and the class loader (instance of org/codehaus/plexus/classworlds/realm/ClassRealm) for the method's defining class, org/apache/jasper/runtime/InstanceManagerFactory, have different Class objects for the type org/apache/tomcat/InstanceManager used in the signature	at org.apache.jsp.index_jsp._jspInit(index_jsp.java:32)	at org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:49)	at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:180)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:721)	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:466)	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:391)	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:318)	at com.meimeixia.web.HelloServlet.doGet(HelloServlet.java:13)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:618)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537)	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1081)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658)	at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222)	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1566)	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1523)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)	at java.lang.Thread.run(Unknown Source)

尼玛的，使用tomcat8插件来运行maven项目，有这么难吗？我也在网上翻阅了好多篇文章，但也没找到一个解决办法，我的心真的好痛啊！但不管怎么样，还是把这个问题记录在这儿吧！如果大家知道一个好的解决办法，那么请告知我一下，万分感谢！！！

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