增加静态方法要重启tomcat？

        在开发过程中，给 com.thunisoft.fy.business.sp.SelectListUtils 新增加了一个public static方法 getTestSelectList()。在页面的处理的logic类里面使用的时候代码提示都可以提示出来，调用方法也没有报编译期错误。刷新界面后，后台运行到刚才调用的地方就报如下错误：

2008-04-21 12:30:27,032 [com.thunisoft.summer.web.action.BaseAction]-[ERROR] runtime exception
java.lang.NoSuchMethodError: com.thunisoft.fy.business.sp.SelectListUtils.getTestSelectList()Lcom/thunisoft/fy/support/selectObj/SelectList;
    at com.thunisoft.fy.spxt.pub.ajxq.AjxqLogic.displayZxAjxq_right(AjxqLogic.java:736)
    at com.thunisoft.fy.spxt.pub.ajxq.AjxqLogic.displayAjxq_right(AjxqLogic.java:116)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:324)
    at com.thunisoft.summer.web.action.MemoryAction.execute(MemoryAction.java:102)
    at org.springframework.web.struts.DelegatingActionProxy.execute(DelegatingActionProxy.java:106)
    at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:430)
    at com.thunisoft.fy.web.struts.SummerRequestProcessor.process(SummerRequestProcessor.java:134)
    at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
    at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
    at com.thunisoft.summer.web.filter.UserAASFilter.doFilter(UserAASFilter.java:111)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
    at org.ajaxanywhere.AAFilter.doFilter(AAFilter.java:46)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
    at com.thunisoft.summer.web.filter.CharsetFilter.doFilter(CharsetFilter.java:48)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
    at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
    at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
    at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
    at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
    at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
    at java.lang.Thread.run(Thread.java:534)

     咨询同事，得到的是“增加静态方法”要重启tomcat服务。我重启了tomcat果然就没有问题了：）
     有点不太明白，为什么增加静态方法就要重启tomcat服务？这样在开发过程中如果经常增加static方法岂不是每次都要重启，然后就会很浪费时间了。另外，为什么如果我只是修改了原来已经存在的static方法的实现，则可以正常调试。