请教一个tomcat 日志错误 java.lang.NullPointerException

sc66

请教一个tomcat日志错误望指点(tomcat5.5 redhat as4 jdk1.5)
Nov 4, 2008 10:11:30 PM org.apache.coyote.http11.Http11Protocol pause
INFO: Pausing Coyote HTTP/1.1 on http-80
Nov 4, 2008 10:11:30 PM org.apache.coyote.tomcat5.CoyoteConnector pause
SEVERE: Protocol handler pause failed
java.lang.NullPointerException
        at org.apache.coyote.tomcat5.CoyoteConnector.pause(CoyoteConnector.java:1444)
        at org.apache.catalina.core.StandardService.stop(StandardService.java:521)
        at org.apache.catalina.core.StandardServer.stop(StandardServer.java:2347)
        at org.apache.catalina.startup.Catalina.stop(Catalina.java:605)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:580)
        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:585)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:287)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:425)