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copied!<p>Grails is a MVC framework. If you want to map an URL directly to a GSP (without redirection through a controller and action) you need to explain this to grails within your <code>UrlMappings.groovy</code>. There you can define your "shortcuts". E.g.:</p> <pre><code>static mappings = { "/$viewName"(view:"/index") { constraints { viewName([some constraints]) } } } </code></pre> <p>Which will render <code>views/index.gsp</code> without going through a controller. If you do NOT define a controller mapping (or at least a view mapping) for those URLs, you canNOT use grails filters:</p> <p>If you really want to intercept ALL requests, you can add a servlet filter to your grails application like this:</p> <pre><code>import javax.servlet.* import org.springframework.web.context.support.WebApplicationContextUtils; class TestFilter implements Filter { def applicationContext void init(FilterConfig config) throws ServletException { applicationContext = WebApplicationContextUtils.getWebApplicationContext(config.servletContext) } void destroy() { } void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { System.out.println("this filter has been called"); } } </code></pre> <p>In here you can do your redirections or renderings based on the <code>applicationcontext</code> and the current <code>request</code>.</p> <p>You need to add this filter to your <code>web.xml</code>. On how to do this, have a look at: <a href="https://stackoverflow.com/questions/9924616/how-do-i-use-a-servlet-in-my-grails-app/9928748#9928748">How do i use a servlet in my grails app?</a></p>

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