web maven jetty Unable to find a javac compiler

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maven工程用jetty启动的通过代码启动

import org.mortbay.jetty.Connector;
import org.mortbay.jetty.Server;
import org.mortbay.jetty.nio.SelectChannelConnector;
import org.mortbay.jetty.webapp.WebAppContext;

public class Sample {
   public static void main(String[] args) throws Exception {

       Server service = new Server();
       Connector connector = new SelectChannelConnector();
       connector.setPort(8082);
       connector.setHost("localhost");
       service.setConnectors(new Connector[] { connector });
       WebAppContext context = new WebAppContext("src/main/webapp", "/webmavenjetty");
       service.addHandler(context);
       service.setStopAtShutdown(true);
       service.setSendServerVersion(true);
       service.start();
       service.join();
       }
}
run as -> java application之后正常

通过浏览器访问时如下错：

ERROR: Javac exception

Unable to find a javac compiler;
com.sun.tools.javac.Main is not on the classpath.
Perhaps JAVA_HOME does not point to the JDK
   at org.apache.tools.ant.taskdefs.compilers.CompilerAdapterFactory.getCompiler(CompilerAdapterFactory.java:105)
   at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:924)
   at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:757)
   at org.apache.jasper.compiler.AntJavaCompiler$JavacObj.run(AntJavaCompiler.java:355)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

at java.lang.Thread.run(Unknown Source)

其实就是tools.jar这个jar文件没找到先查看JDK的安装目录下是否有tool.jar文件（Java\jdk1.7.0_45\lib）再把tool.jar加到jre中，如下：Eclipse window -> Preferences ->Java ->Installed JRES -> Edit ->Add External JARS 添加tool.jar

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