tomcat应用服务老是抛 NullPointerException 在HttpResponseStream.checkHead

[chineseren2000]

window 2000下安装的tomcat4.0.3，webapps下发布了5，6个业务，因为是商务网站，所以所有的网页都是.jsp的,每次启动tomcat，工作一段时间之后（大概2，3个小时），tomcat的窗口就会出现这个异常:
java.lang.NullPointerException
at org.apache.catalina.connector.http.HttpResponseStream.checkHead(HttpR
esponseStream.java:253)
at org.apache.catalina.connector.http.HttpResponseStream.<init>(HttpResp
onseStream.java:104)
at org.apache.catalina.connector.http.HttpResponseImpl.createOutputStrea
m(HttpResponseImpl.java:220)
at org.apache.catalina.connector.ResponseBase.getOutputStream(ResponseBa
se.java:725)
at org.apache.catalina.connector.ResponseBase.finishResponse(ResponseBas
e.java:469)
at org.apache.catalina.connector.HttpResponseBase.finishResponse(HttpRes
ponseBase.java:236)
at org.apache.catalina.connector.http.HttpResponseImpl.finishResponse(Ht
tpResponseImpl.java:288)
at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcesso
r.java:1039)
at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.ja
va:1107)
at java.lang.Thread.run(Thread.java:536)
tomcat的/tomcat/logs/catalina_log.2004-04-29.txt里面同时有这样的异常：
2004-04-29 17:43:32 HttpProcessor[80][8] Starting background thread
2004-04-29 17:43:37 HttpProcessor[80][8] process.parse
java.io.IOException: Line too long
at org.apache.catalina.connector.http.SocketInputStream.readRequestLine(SocketInputStream.java:271)
at org.apache.catalina.connector.http.HttpProcessor.parseRequest(HttpProcessor.java:695)
at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:959)
at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1107)
at java.lang.Thread.run(Thread.java:534)
然后如果这样的异常一多了以后，访问http://127.0.0.1时都是无法打开网页，就跟没有web服务器一样，查看/tomcat/logs/catalina_log.2004-04-29.txt会发现这个提示：
2004-04-29 19:43:37 HttpConnector[80] No processor available, rejecting this connection

请问大虾这个到底是什么异常？它是由什么原因造成的？怎么解决？

小弟再次先谢过了！！ //bow!!!