Avoiding JETTY Locking Static Files

Files are locked on Windows and can’t be replaced
Jetty buffers static content for webapps such as html files, css files, images etc and uses memory mapped files to do this if the NIO connectors are being used. The problem is that on Windows, memory mapping a file causes the file to be locked, so that the file cannot be updated or replaced. This means that effectively you have to stop Jetty in order to update a file.

Solution
You can configure the default jetty Servlet directly in the web.xml. Add this configuration snippet to web.xml

<web-app ...>
...

<servlet>
    <servlet-name>default</servlet-name>
    <servlet-class>org.mortbay.jetty.servlet.DefaultServlet</servlet-class>
    <init-param>
      <param-name>useFileMappedBuffer</param-name>
      <param-value>false</param-value>
    </init-param>
    <load-on-startup>0</load-on-startup>
</servlet> 

...
</web-app>

For more information you can look at Jetty Wiki.
http://docs.codehaus.org/display/JETTY/Files+locked+on+Windows

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About kaanmutlu

Software Developer - Computer Engineer from Istanbul, Turkey
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