Tomcat的SEVERE: Remote Host / SocketException: Connection reset原因分析及解决办法

昨天在测试帮助文件时发现一直打不开，好像是一直再刷新，于是就到服务器上查看Tomcat的日志，就发现了下面的信息：

Apr 21, 2008 9:27:34 AM org.apache.tomcat.util.net.TcpWorkerThread runIt

SEVERE: Remote Host /172.16.128.248 SocketException: Connection reset

并且这两条信息几乎是每个1-2秒就出现一次，很是频繁。于是就搜索了一下，就找到了下面的内容：

The usual cause is that the browser's stopped a HTTP request part-way through,

generally because the user's navigated to another page before the first page has

completely downloaded. The browser closes the connection, with the result that

Tomcat gets an exception when it next tries to write data to the socket.

Arguably it shouldn't be logged as a SEVERE error on production systems, but

getting that log message during development and stress testing can be very

handy! 于是就查看它引用的JavaScript文件，发现好多不存在。终于明白，是因为有些变量不存在，导致了这里的反复重载。重新加入这些JavaScript文件后，问题解决。

Fix it by any of the following (in increasing order of difficulty):

1) Ignore it (and change any log-reading scripts that look for SEVERE errors to

ignore this one);

2) Grab the source for 5.0.28, find the line where this is logged and change the

logging level in the case of a connection reset error, then recompile Tomcat;

3) Educate your users that they are supposed to sit on their hands until the

page has completely loaded (by far the hardest ;-) ).

后面还有别人的补充：

If it happens that often and you don't have a high traffic site, it might be a monitor script, that does only check if it can do a TCP connect and drop the connection before a full HTTP request-response cycle has finished.

不过我的情况和上面所说的都不符合，于是就查看了源文件，发现了如下代码：

if (!window.gbWhVer||!window.gbWhUtil||!window.gbWhMsg)

    document.location.reload();