跪求tomcat关闭时出下如下错误??
tomcat应用的时候都没有事,,人一多就会挂了啊.关闭tomcat重启又可以了啊. 
 看日志会报出如下错误: 
 请各位大侠帮忙小弟一下啊,这个问题困绕了我好久了啊. 
 信息:   Illegal   access:   this   web   application   instance   has   been   stopped   already.      Could   not   load   java.lang.System.      The   eventual   following   stack   trace   is   caused   by   an   error   thrown   for   debugging   purposes   as   well   as   to   attempt   to   terminate   the   thread   which   caused   the   illegal   access,   and   has   no   functional   impact.  
java.lang.IllegalStateException  	at   
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1241) 
 	at   org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1201) 
 	at   java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) 
 	at   share.MD5.getMD5ofStr(MD5.java:58) 
 	at   org.apache.jsp.viewthread_jsp._jspService(viewthread_jsp.java:439) 
 	at   org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) 
 	at   javax.servlet.http.HttpServlet.service(HttpServlet.java:802) 
 	at   org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334) 
 	at   org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314) 
 	at   org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264) 
 	at   javax.servlet.http.HttpServlet.service(HttpServlet.java:802) 
 	at   org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) 
 	at   org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) 
 	at   org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) 
 	at   org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) 
 	at   org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) 
 	at   org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) 
 	at   org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) 
 	at   org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) 
 	at   org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:833) 
 	at   org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:639) 
 	at   org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1285) 
 	at   java.lang.Thread.run(Thread.java:595) 
 2007-5-8   7:56:44   org.apache.catalina.loader.WebappClassLoader   loadClass 
 信息:   Illegal   access:   this   web   application   instance   has   been   stopped   already.      Could   not   load   java.io.PrintStream.      The   eventual   following   stack   trace   is   caused   by   an   error   thrown   for   debugging   purposes   as   well   as   to   attempt   to   terminate   the   thread   which   caused   the   illegal   access,   and   has   no   functional   impact. 
 java.lang.
                         求正则示意式去除html标签的样式保留img标签的src