failure(6107)

I am developing a web application in a Sun solaris 5.8 with 1 proccessor and 1 GB RAM , the webServer is a IPlanet WebServer 4.1 . When i executed the application i have obtained the nex error log :

[29/Apr/2005:11:58:43] failure ( 6107): RespondNotModified(): Error writing to socket (Connection reset by peer)

[29/Apr/2005:12:01:02] failure ( 6107): RespondNotModified(): Error writing to socket (Connection reset by peer)

[29/Apr/2005:12:01:16] failure ( 6107): RespondNotModified(): Error writing to socket (Connection reset by peer)

[29/Apr/2005:12:02:09] failure ( 6107): Internal error: exception thrown from the servlet service function (uri=/iges/servlet/igEspera): java.lang.NoSuchMethodError, stack: java.lang.NoSuchMethodError

at java.lang.Throwable.fillInStackTrace(Native Method)

at java.lang.Throwable.fillInStackTrace(Compiled Code)

at java.lang.Throwable.<init>(Compiled Code)

at java.lang.Error.<init>(Error.java:41)

at java.lang.LinkageError.<init>(LinkageError.java:33)

at java.lang.IncompatibleClassChangeError.<init>(IncompatibleClassChangeErro r.java:33)

at java.lang.NoSuchMethodError.<init>(NoSuchMethodError.java:36)

at java.lang.Thread.destroy(Thread.java:704)

at igEspera.service(Compiled Code)

at javax.servlet.http.HttpServlet.service(Compiled Code)

at com.netscape.server.http.servlet.NSServletRunner.Service(Compiled Code)

, root cause:

any idea which is the problem?

[1561 byte] By [serperga] at [2007-11-25 19:12:02]