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From "Alex O'Ree" <alexo...@apache.org>
Subject Re: Skip resource path in TLD scanner?
Date Sat, 18 Nov 2017 13:30:28 GMT
I'm having similar issues after updating from tomcat7 to tomcat8.5. The
build script for my app adds some sql drivers to tomcat's lib folder,
specifically the derby driver. On bootup tomcat logs a ton of error
messages saying that it couldn't find (what looks to be) internationalized
resource files for derby, which aren't present.

On Fri, Nov 17, 2017 at 2:39 PM, Ray Holme <rayholme@yahoo.com.invalid>
wrote:

> I use JSP and there are taglibs used.
> But you can cut the scan time way down by not scanning any libraries that
> don't have TLDs
>  (nested files with name => .tld)
> You can find this by using "jar t" or "unzip -l" on each library (thanks
> Chris).
>
> If you are a Unix (Linux or MAC) user you may cheat a little by using the
> script attached.
> You may put any all .jar files in .../apache/lib or
> .../apache/webapps/*/WEB-INF/lib into the
>   .../apache/conf/catalina.properties file if they do not have taglibs.
> So 90% of what I need does not have taglibs (just jstl-impl-...jar DOES
> and must be left out of the DO NO SCAN line.
> This took my startup time from a couple minutes to under a second.
>
> Best of luck.
>
>
> On Friday, November 17, 2017 1:26 PM, Christopher Schultz <
> chris@christopherschultz.net> wrote:
>
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> Matt,
>
> On 11/16/17 12:11 PM, Matt Cosentino wrote:
> > This keeps getting worse, my site was down for over a minute while
> > the TLD scanner ran. There must be something I can do.
> If you need taglibs, you'll need to do TLS scanning. There really is
> no way to avoid that that I know of. One of many reasons I don't like
> JSP as a technology.
>
> If you are having a problem with downtime, you have other options that
> might help in other areas. For example, you could set up a second
> server and load-balance between the two of them. This protects you
> from a number of downtime-causing issues such as power failures, JVM
> crashes, and -- as in your example here -- planned maintenance.
>
> Running a single instance of your application in a production
> environment where uptime matters is really not an appropriate
> solution. If you had two servers, your application's restart time
> would not have been an issue.
>
> - -chris
>
> > -----Original Message----- From: Mark Thomas
> > [mailto:markt@apache.org] Sent: Saturday, April 29, 2017 5:02 AM
> > To: Tomcat Users List <users@tomcat.apache.org> Subject: Re: Skip
> > resource path in TLD scanner?
> >
> > On 28/04/17 17:00, Matt Cosentino wrote:
> >> Yes, it's other folders within WEB-INF. I turned on the
> >> TldScanner logging and it is definitely what is causing the
> >> delay. My situation probably isn't very typical. The delay varies
> >> in my various web applications, the worst being about 20 seconds.
> >> It all adds up though, and every second counts when our sites are
> >> down.
> >
> > There is a solution available but it is intended more for the
> > embedded use case rather than a standard Tomcat install. Using it
> > in a standard install would require (effectively) patching Tomcat.
> >
> > The general idea would be to use the TldPreScanned class. That does
> > require all the TLDs to be listed in advance. On the plus side, no
> > scanning delay. On the down side, adding TLDs requires code
> > changes. Doing this with a standard Tomcat install requires changes
> > to the JasperInitializer (hence the patch). I don't think there is
> > a pure config way around that but I'll look into it.
> >
> > A better solution would probably be to make it easier to plugin in
> > a custom TLDScanner - i.e. purely with config. If you'd like us to
> > explore this option we should re-open 61052 and adjust accordingly.
> > I don't think there is enough demand for filtering resource paths
> > to make that worth implementing.
> >
> > One final thought. Are you running the web application from a WAR
> > or an expanded directory? (The latter would be faster).
> >
> > Mark
> >
> >
> >
> >>
> >> - Matt
> >>
> >>
> >> -----Original Message----- From: Mark Thomas
> >> [mailto:markt@apache.org] Sent: Friday, April 28, 2017 7:28 AM
> >> To: Tomcat Users List <users@tomcat.apache.org> Subject: Re: Skip
> >> resource path in TLD scanner?
> >>
> >> On 27/04/17 23:39, Matt Cosentino wrote:
> >>> https://tomcat.apache.org/tomcat-8.0-doc/config/systemprops.html
> >>>
> >>>
> >>>
> There is one for skipping jar files:
> >>>
> >>> tomcat.util.scan.StandardJarScanFilter.jarsToSkip
> >>
> >> <snip/>
> >>
> >>> It skips /WEB-INF/classes/ and /WEB-INF/lib/, but it does not
> >>> check any property to skip user defined paths.
> >>
> >> Is it other paths within WEB-INF you need to skip?
> >>
> >> When I read "skipping resource paths" I was thinking of skipping
> >> the various places where Tomcat treat directories as JARs that
> >> then get scanned for TLDs (which can be configured via the
> >> JarScanner). But it sounds like skipping those won't help you.
> >>
> >> How sure are you that it is checking the directories below
> >> WEB-INF that is the cause of the delay? That isn't a typical
> >> source of start-up delay although it is certainly possible.
> >>
> >> Finally, what sort of delay are we talking out here? Seconds?
> >> Minutes?
> >>
> >> Mark
> >>
> >>
> >>> -----Original Message----- From: Mark Thomas
> >>> [mailto:markt@apache.org] Sent: Thursday, April 27, 2017 5:05
> >>> PM To: Tomcat Users List <users@tomcat.apache.org> Subject: Re:
> >>> Skip resource path in TLD scanner?
> >>>
> >>> On 27/04/17 21:17, Matt Cosentino wrote:
> >>>> I need to skip some of the resource paths within WEB-INF. I
> >>>> know there's a property for skipping jar files, but I
> >>>> couldn't find one for resource paths. I reported this as a
> >>>> bug and was told that the property exists. Where is it?
> >>>
> >>> Where have you looked?
> >>>
> >>> Mark
> >>
> >> ---------------------------------------------------------------------
> >>
> >>
> >
> >>
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> >
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