How to prevent caching of static files in embedded Jetty instance? - caching

Question

I want to prevent my CSSs from being cached on the browser side. How can I do it in embedded Jetty instance?
If I were using xml configuration file, I would add lines like:
<init-param>
<param-name>cacheControl</param-name>
<param-value>max-age=0,public</param-value>
</init-param>
How I can turn that into the code?
Right now I start Jetty this way:
BasicConfigurator.configure();
Server server = new Server();
SocketConnector connector = new SocketConnector();
// Set some timeout options to make debugging easier.
// 1 hour
connector.setMaxIdleTime( 1000 * 60 * 60 );
connector.setSoLingerTime( -1 );
connector.setPort( 8081 );
server.setConnectors( new Connector[] { connector } );
WebAppContext bb = new WebAppContext();
bb.setServer( server );
bb.setContextPath( "/" );
bb.setWar( "src/webapp" );
server.addHandler( bb );
I think I should search setControlCache somewhere in the WebAppContext area of responsibility.
Any advices on this?

Answer 1

I normally use a ServletHolder, like this:
WebAppContext context = new WebAppContext();
ServletHolder servletHolder = new ServletHolder(MyServlet.class);
servletHolder.setInitParameter("cacheControl","max-age=0,public");
context.addServlet(servletHolder, "myservletpath");
While this does not exactly match your code you should be able to figure it out from there ?

Answer 2

Duh, how to do just the opposite How to configure cache for static resources in web.xml for Jetty??

Answer 3

And here's just a working code with no need to figure out, guess and try. It's provided with respect to code in question and jetty 6. For jetty 7 and higher need to change Context to ServletContextHandler.
BasicConfigurator.configure();
Server server = new Server();
SocketConnector connector = new SocketConnector();
// Set some timeout options to make debugging easier.
// 1 hour
connector.setMaxIdleTime( 1000 * 60 * 60 );
connector.setSoLingerTime( -1 );
connector.setPort( 8081 );
server.setConnectors( new Connector[] { connector } );
//--- The difference with code in question starts here
DefaultServlet defaultServlet = new DefaultServlet();
ServletHolder holder = new ServletHolder(defaultServlet);
holder.setInitParameter("useFileMappedBuffer", "false");
holder.setInitParameter("cacheControl", "max-age=0, public");
Context bb = new Context();
bb.setResourceBase("src/webapp");
bb.addServlet(holder, "/");
//--- Done. Caching is off!
server.addHandler( bb );
// Run server as usual with server.run();
My sample also sets useFileMappedBuffer to false which is needed for not blocking files on a disk if you are developing on Windows by any reason.

Answer 4

I use resourceHandler for static contents.
Here's a code working fine on Jetty 9.
ResourceHandler rh = new ResourceHandler();
rh.setResourceBase([your_resource_base_dir]);
rh.setCacheControl("no-store,no-cache,must-revalidate");