Add servlet filter for multiple paths in embedded Jetty

Question

I'm creating a servlet filter which should only handle requests to specific paths in my application.

I can add a filter to my ServletContextHandler easily, for example like this:

FilterHolder holder = new FilterHolder(new MyFilter());
holder.setInitParameter("param", "a");
contextHandler.addFilter(holder, "/x", EnumSet.allOf(DispatcherType.class));

But how can I add more paths to this filter? I want it to handle requests to /y as well.

I can't seem to find any easy and correct way to do this. Using a web.xml I would simply define multiple <url-pattern> tags under the filter mapping.

Using Jetty version 9.3.0.v20150612.

Answer 1

Just add the filter (via its holder) multiple times.

FilterHolder holder = new FilterHolder(new MyFilter());
holder.setName("my-filter");
holder.setInitParameter("param", "a");
contextHandler.addFilter(holder, "/x", EnumSet.allOf(DispatcherType.class));
contextHandler.addFilter(holder, "*.y", EnumSet.allOf(DispatcherType.class));
contextHandler.addFilter(holder, "/z/*", EnumSet.allOf(DispatcherType.class));

Alternative technique (reusing holder generated from addFilter)

Enum<DispatcherType> dispatchers = EnumSet.allOf(DispatcherType.class);
FilterHolder holder = contextHandler.addFilter(MyFilter.class, "/x", dispatchers);
holder.setInitParameter("param", "a");
contextHandler.addFilter(holder, "*.y", dispatchers);
contextHandler.addFilter(holder, "/z/*", dispatchers);