关于maven和jetty的hot redeploy有关问题

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  
    <groupId>com.lj.hotmaven</groupId>
    <artifactId>hotmaven</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    
  
   
  <packaging>war</packaging>
  <name>user-web Maven Webapp</name>
  <url>http://maven.apache.org</url>

		<dependencies>
			<dependency>
				<groupId>junit</groupId>
				<artifactId>junit</artifactId>
				<version>4.10</version>
				<scope>test</scope>
			</dependency>
			 
			 
		 
			<dependency>
				<groupId>commons-logging</groupId>
				<artifactId>commons-logging</artifactId>
				<version>1.1.1</version>
			</dependency>
		 

			<dependency>
				<groupId>org.mortbay.jetty</groupId>
				<artifactId>servlet-api</artifactId>
				<version>2.5.20110712</version>
				<scope>provided</scope>
			</dependency>
 
		</dependencies>
 
 <build>
		<pluginManagement>
			<plugins>
				<plugin>
				  <groupId>org.mortbay.jetty</groupId>
				  <artifactId>jetty-maven-plugin</artifactId>
				  <configuration>
				    <scanIntervalSeconds>10</scanIntervalSeconds>
				    <webApp>
				      <contextPath>/hello</contextPath>
				    </webApp>
				    <connectors>
				       <connector implementation="org.eclipse.jetty.server.nio.SelectChannelConnector">
				          <port>8787</port>
				          <maxIdleTime>60000</maxIdleTime>
				       </connector>
				     </connectors>
				  </configuration>
				</plugin>
				 
				 
					 
			</plugins>