tomcat7:run方法启动web项目报错

报错信息

今天做分布式项目的时候，在eclipse中通过命令tomcat7:run启动tomcat的不同端口来启动web项目的时候报错，报错信息如下：

严重: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component 
[StandardEngine[Tomcat].StandardHost[localhost].StandardContext[/ebookshop]]
	at java.util.concurrent.FutureTask.report(FutureTask.java:122)
	at java.util.concurrent.FutureTask.get(FutureTask.java:188)
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1123)
	at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:800)
	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.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: org.apache.catalina.LifecycleException: Failed to start component 
[StandardEngine[Tomcat].StandardHost[localhost].StandardContext[/ebookshop]]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
	... 6 more
Caused by: java.lang.LinkageError: loader constraint violation: loader 
(instance of org/apache/catalina/loader/WebappClassLoader) previously initiated loading for a different type with
 name "javax/servlet/ServletContext"
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
	at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1191)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1669)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547)
	at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.
java:167)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5423)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	... 6 more

解决办法

配置

<build>
		<finalName>roncoo-pay-web-sample-shop</finalName>
		<plugins>
			<plugin>
				<groupId>org.apache.tomcat.maven</groupId>
				<artifactId>tomcat7-maven-plugin</artifactId>
				<version>2.2</version>
				<configuration>
					<!-- 指定端口 -->
					<port>8084</port>
					<!-- 请求路径 -->
					<path>/</path>
				</configuration>
			</plugin>
		</plugins>
	</build>

加入的maven坐标

<dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.0.1</version>
      <scope>provided</scope>
   </dependency>
 
    <!-- java ee jar 包 -->
    <dependency>
      <groupId>javax</groupId>
      <artifactId>javaee-api</artifactId>
      <version>6.0</version>
      <scope>provided</scope>
    </dependency>
 
    <!-- JSP相关 -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.0</version>
      <scope>provided</scope>
    </dependency>