Disable taglib scanning in google app engine (Jetty)

Question

Trying to reduce the startup time of my instances I've come accross the taglib classpath scanning.

My application has 50mb of jars. The scanning of the tld takes 20% of the startup time.

Yourkit capture of the startup time

Is there a way to disable that? I just use JSTL standard libs which are already included (gae doc for jsp)

I'd like to disable as well JSP precompilation.

have you found the answer? the proposed answer doesn't work on appengine. — Rafael Sanches, Jul 12 '13 at 00:10
What did work for Rafael is renaming his JARs to match the predefined NoTLDJarPattern pattern of AppEngine's default web.xml: http://stackoverflow.com/a/28203683/180740 — Philipp Reichart, Jan 28 '15 at 22:33

score 4 · Answer 1 · answered Nov 13 '12 at 08:04

4

I looked in the sourcecode of TagLibConfiguration http://javasourcecode.org/html/open-source/jetty/jetty-6.1.26/org/mortbay/jetty/webapp/TagLibConfiguration.java.html#line.134 and found that it respects a parameter NoTLDJarPattern

The NoTLDJarPattern paramter is configured in web.xml to reduce scanning time:

<context-param>
    <param-name>org.mortbay.jetty.webapp.NoTLDJarPattern</param-name>
    <param-value>test.jar|prefix-.*\.jar</param-value>
</context-param>

answered Nov 13 '12 at 08:04

Aksel Willgert

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I'd like to debug that. How can I find which exact version of jetty does gae 1.7.3 use? – Jordi P.S. Nov 14 '12 at 13:01
Sorry i got no idea, btw what tool do you use to produce that screenshot? – Aksel Willgert Nov 16 '12 at 21:19
this doesn't work for appengine. Are you shure it should work? – Rafael Sanches Jul 12 '13 at 00:00
1

Sorry, i just looked it up in some jetty sources and wrote an answer that got accepted. I never actually tried it :( – Aksel Willgert Jul 12 '13 at 06:40

score 1 · Answer 2 · answered Nov 08 '12 at 13:24

1

See this...

Jsp Jetty Configuration

Greetings.

answered Nov 08 '12 at 13:24

MG_Bautista

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Ma Jerez · Answer 3 · 2012-11-13T10:17:24.757

0

You can easily disable precompilation, just put next line in the deployment descriptor web.xml file : App-Engine doc here.

<precompilation-enabled>false</precompilation-enabled>

edited Nov 13 '12 at 10:17

answered Nov 12 '12 at 22:42

Ma Jerez

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precompilation should be enabled, that means to compile JSP at deployment time, not at instance init time, and that's what we want – Jordi P.S. Dec 27 '12 at 14:35

Disable taglib scanning in google app engine (Jetty)

3 Answers3