Ran into a problem earlier today and thought I would share the solution.
I have set up appfuse to edit files in place using jetty:run. I found I
was able to edit jsps fine, but when I tried javascipt or css files I
was getting the following error (if my app was running and I had already
navigated to a page).
"The requested operation cannot be performed on a file with a
user-mapped section open"
Which basically meant (from what I understand) that my browser had the
file open through memory mapped files and NIO.
A little google love uncovered
http://docs.codehaus.org/display/JETTY/Files+locked+on+Windows
http://docs.codehaus.org/display/JETTY/Maven+Jetty+Plugin
From there the solution was to
1. Extract webdefault.xml from Jetty.jar at
org.jetty.org/mortbay/jetty/webapp/webdefault.xml
and save in my project
2. Edit webdefault.xml to change useFileMappedBuffer to false
<init-param>
<param-name>useFileMappedBuffer</param-name>
<param-value>true</param-value>
</init-param>
to
<init-param>
<param-name>useFileMappedBuffer</param-name>
<param-value>false</param-value>
</init-param>
3. Tell Jetty maven plug-in to use my webdefault.xml by adding
<webDefaultXml>src/main/resources/webdefault.xml</webDefaultXml>
to my pom.xml under configuration for the maven-jetty-plugin.
From the sounds of it this error only occurs on windows.
Daryl
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