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From Pid <...@pidster.com>
Subject Re: Webapp reloading issue and intermittent 404 errors
Date Tue, 29 Jun 2010 11:36:54 GMT
On 29/06/2010 11:51, Tomislav Petrović wrote:
> Tomislav Petrović said on 28.6.2010 15:46:
>> Caldarale, Charles R said on 28.6.2010 15:32:
>>>> Seems to me it is related to web app reloading but this
>>>> is my blind guess.
>>>
>>> What makes you suspicious that reloading is going on?
>>>
>>
>> Just my VERY BIG AND BLIND guess based on classes involved in stack trace.
>>
> 
> This is my "dissection" of problematic stacktrace using my limited Java knowledge and
Tomcat sources.
> Stacktrace written in "reverse" way to follow code flow more easily.
> 
> 	at java.lang.Thread.run(Thread.java:619)
> 	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1590)
> 	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)
> 	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)
> 	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1601)
> 
> Background thread which periodically calls "backgroundProcess" on container and its children,
I believe it is 
> used to determine wether app needs to be reloaded (make sense to me that something periodically
needs to check
> wether app needs to be reloaded).
> 
> 	at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1309)
> 	at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:398)
> 	at org.apache.catalina.loader.WebappLoader.modified(WebappLoader.java:477)
> 	at org.apache.catalina.loader.WebappClassLoader.modified(WebappClassLoader.java:822)
> 	
> "modified" is called in order to find if "one or more classes or resources been modified
so that a reload is appropriate?",
> at least that is what the JavaDoc comment says.
> 
> 	at org.apache.naming.resources.ProxyDirContext.getAttributes(ProxyDirContext.java:840)
> 	at org.apache.naming.resources.BaseDirContext.getAttributes(BaseDirContext.java:747)
> 	at org.apache.naming.resources.FileDirContext.getAttributes(FileDirContext.java:429)
> 
> Just forwards call to more appropriate classes up to here.
> 
> 	at org.apache.naming.resources.FileDirContext.file(FileDirContext.java:811)
> 
> Here a File object of "Return a File object representing the specified normalized
> context-relative path if it exists and is readable" is created, however name given to
it
> chokes up "normalize", it seems.
> 
> 	at org.apache.naming.resources.FileDirContext.normalize(FileDirContext.java:771)
> 	at org.apache.catalina.util.RequestUtil.normalize(RequestUtil.java:131)
> 
> This is problematic code (part of normalize method):
> 
> 	// Resolve occurrences of "//" in the normalized path
> 	while (true) {
> 		int index = normalized.indexOf("//");
> 		if (index < 0)
> 			break;
> 		normalized = normalized.substring(0, index) +
> 			normalized.substring(index + 1);
> 	}
> 
> Seems to me code assumes that if it founds "//" in a string then this "//" is not at
the
> end of the string (has to have something behind it). In general case this sounds like
a 
> bug to me (however I am not expert here and don't know from where filename comes and
how
> it should be written).
> So if anyone can tell me form where a name (filename) given to normalize comes (I assume
> it is something in classpath, configuration, path, or....?). So I can find it and remove
> (probably extra // or \) to solve my problem.
> 
> And after I know what caused this, should this be reported as bug into Bugzilla?

Not unless someone here says so.  We haven't eliminated the possibility
of errors in the config files yet.


p

> I'll give you server.xml and other conf as soon as I get them today.
> 
> Thanks everyone,
> --
> Tomy <t.petrovic@inet.hr>
> 
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