maven快速入门第七讲——在maven中安装tomcat8-maven-plugin插件，并使用它来运行maven工程

梦里梦外; 2023-06-24 08:15 21阅读 0赞

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。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9saWF5dW4uYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70]  
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[https://mvnrepository.com/artifact/org.apache.tomcat.maven/tomcat8-maven-plugin][https_mvnrepository.com_artifact_org.apache.tomcat.maven_tomcat8-maven-plugin]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。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9saWF5dW4uYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 1]  
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。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9saWF5dW4uYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 2]  
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：

<pluginRepositories>
        <pluginRepository>
            <id>alfresco-public</id>
            <url>https://artifacts.alfresco.com/nexus/content/groups/public</url>
        </pluginRepository>
        <pluginRepository>
            <id>alfresco-public-snapshots</id>
            <url>https://artifacts.alfresco.com/nexus/content/groups/public-snapshots</url>
            <snapshots>
                <enabled>true</enabled>
                <updatePolicy>daily</updatePolicy>
            </snapshots>
        </pluginRepository>
        <pluginRepository>
            <id>beardedgeeks-releases</id>
            <url>http://beardedgeeks.googlecode.com/svn/repository/releases</url>
        </pluginRepository>
    </pluginRepositories>

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

<plugin>
        <groupId>org.apache.tomcat.maven</groupId>
        <artifactId>tomcat8-maven-plugin</artifactId>
        <version>3.0-r1655215</version>
        <configuration>
            <server>tomcat8</server>
            
            <port>8080</port>
            
            <path>/hellomaven</path>
            
            <uriEncoding>utf-8</uriEncoding>
        </configuration>
    </plugin>

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。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9saWF5dW4uYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 3]  
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。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9saWF5dW4uYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 4]  
这时，eclipse控制台打印出了如下内容。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9saWF5dW4uYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 5]  
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：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9saWF5dW4uYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 6]  
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 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
    	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 cause
    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
    	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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[https_mvnrepository.com_artifact_org.apache.tomcat.maven_tomcat8-maven-plugin]: https://mvnrepository.com/artifact/org.apache.tomcat.maven/tomcat8-maven-plugin
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9saWF5dW4uYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20191221210106688.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9saWF5dW4uYmxvZy5jc2RuLm5ldA==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9saWF5dW4uYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20191221210120518.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9saWF5dW4uYmxvZy5jc2RuLm5ldA==,size_16,color_FFFFFF,t_70
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