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From Apache Wiki <wikidi...@apache.org>
Subject [Tomcat Wiki] Update of "HowTo/FasterStartUp" by KonstantinKolinko
Date Thu, 13 Feb 2014 11:16:25 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Tomcat Wiki" for change notification.

The "HowTo/FasterStartUp" page has been changed by KonstantinKolinko:
https://wiki.apache.org/tomcat/HowTo/FasterStartUp?action=diff&rev1=21&rev2=22

Comment:
Add TOC. Minor wording tweaks.

  = How do I make Tomcat startup faster? =
  
- This section provides several recommendations on how to make your web application and Tomcat
as a whole to start up faster.
+ <<TableOfContents>>
  
+ This section provides several recommendations on how to make your web application and Apache
Tomcat as a whole to start up faster.
+ 
- Before we continue to specific tips and tricks, the general advice is that if Tomcat hangs
or is not responsive you have to perform diagnostics. That is to take '''several thread dumps'''
to see what Tomcat is really doing. See [[FAQ/Troubleshooting_and_Diagnostics|Troubleshooting
and Diagnostics]] page for details.
+ Before we continue to specific tips and tricks, the general advice is that if Tomcat hangs
or is not responsive, you have to perform diagnostics. That is to take '''several thread dumps'''
to see what Tomcat is really doing. See [[FAQ/Troubleshooting_and_Diagnostics|Troubleshooting
and Diagnostics]] page for details.
  
  == JAR scanning ==
  
- The [[Specifications|Servlet 3.0 specification]] (chapter 8) introduces support for several
"plugability features". Those exist to simplify a structure of a web application and to simplify
plugging of additional frameworks. Unfortunately, these features require scanning of JAR and
class files, which may take noticeable time. Conformance to the specification requires that
the scanning were performed by default, but you can configure your own web application in
several ways to avoid it (see below). It is also possible to configure which JARs Tomcat should
skip.
+ The [[Specifications|Servlet 3.0 specification]] (chapter 8) introduced support for several
"plugability features". Those exist to simplify a structure of a web application and to simplify
plugging of additional frameworks. Unfortunately, these features require scanning of JAR and
class files, which may take noticeable time. Conformance to the specification requires that
the scanning were performed by default, but you can configure your own web application in
several ways to avoid it (see below). It is also possible to configure which JARs Tomcat should
skip.
  
  For further talk, the features that require scanning are:
  
@@ -56, +58 @@

  
  Remove any JAR files you do not need. When searching for classes every JAR file needs to
be examined to find the needed class. If the jar file is not there - there is nothing to search.
  
- Note that a web application should never have its own copy of Servlet API or Tomcat classes.
All those are provided by the container (Tomcat) and should never be present in the web application.
If you are using Apache Maven, such dependencies should be configured with `<scope>provided</scope>`.
See also a [[http://stackoverflow.com/questions/1031695/how-to-exclude-jars-generated-by-maven-war-plugin|
stackoverflow page]].
+ ''Note'' that a web application should never have its own copy of Servlet API or Tomcat
classes. All those are provided by the container (Tomcat) and should never be present in the
web application. If you are using Apache Maven, such dependencies should be configured with
`<scope>provided</scope>`. See also a [[http://stackoverflow.com/questions/1031695/how-to-exclude-jars-generated-by-maven-war-plugin|
stackoverflow page]].
  
  === Exclude JARs from scanning ===
  
@@ -82, +84 @@

  
  With Tomcat 7.0.23+ you can configure it to start several web applications in parallel.
This is disabled by default but can be enabled by setting the `startStopThreads` attribute
of a '''Host''' to a value greater than one.
  
+ == Other ==
+ 
- == Memory ==
+ === Memory ===
  
  Tweak memory parameters - Google is your friend.
  
  
- == Config ==
+ === Config ===
  
  Trim the config files as much as possible. XML parsing is not cheap. The less there is to
parse - the faster things will go.
  
- == Web application ==
+ === Web application ===
  
   1.  Remove any web applications that you do not need. (So remove the all the web applications
installed with tomcat)
   2.  Make sure your code is not doing slow things. (Use a profiler)

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