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The following page has been changed by ClaudeBrisson:
http://wiki.apache.org/jakarta-velocity/StreamLayoutServlet

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      * tools.view.servlet.layout.default.template the default layout template. 
Default is default.vtl.
      * tools.view.servlet.error.template the error template. Default is 
error.vtl.
  
- Performance issue: when the resource loader cache is off, the page template 
is parsed twice per request. Be sure to turn on the cache in a production 
environment.
+ When the resource loader cache is off, the page template is parsed twice per 
request. Apart from a performence issue, there is also a problem
+ with the #head directive since it works in a cumulative way. Since there is 
no generic way for the servlet to know whether cache is on or off,
+ there is currently no simple workaround to this problem, which means that 
cache MUST be turned on for #head() to work properly.
  
  The patch is attached. Please note that the new directives make use of the 
new velocity-1.5 TemplateInitException, so you will have to compile 
velocity-tools against velocity-1.5-dev. Otherwise you can easily adapt the 
sources to have it work with velocity-1.4 by replacing TemplateInitException
  with a generic Exception.

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