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Re: [jetty-users] Jetty 9 embedded Servlet 3.0 annotations without war file
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thank you very much Johannes, it works like a charme.
Christian
On 21.01.2015 15:21, Johannes Brodwall wrote:
> Hi Christian, Joakim
>
> The code was developed simply to get my application running with @WebServlet annotations, so
> it's not surprising that it has limitations. I explored Jetty's source code to find out how
> they handled these three annotations (listener, servlet and filter).
>
> The code for most of the other annotations seems to be in a separate part of Jetty. I suspect
> that you can deal with many of these by doing:
>
> webAppContext.addDecorator(new AnnotationDecorator(webAppContext));
>
> That should hopefully take care of multipart.
>
> As to @HandlesType, I have not discovered any usage of this in the Jetty code base, so I don't
> know how to get started.
>
>
> ~Johannes
>
>
>
> On Fri, Jan 16, 2015 at 5:16 PM, Christian Reuschling <reuschling@xxxxxxxxxxxxxx
> <mailto:reuschling@xxxxxxxxxxxxxx>> wrote:
>
> indeed, I tried to use Johannes code, and it seemed to work well, but @MultipartConfig was not
> recognized. I used WebAppContext instead of ServletContextHandler, but this didn't do the
> trick:
>
>
>
> WebAppContext contextHandler = new WebAppContext(); contextHandler.setContextPath("/");
> contextHandler.setResourceBase(".");
>
> server.setHandler(contextHandler);
>
> // unnecessary, servlet will be started during annotation scanning //
> contextHandler.addServlet(new ServletHolder(new ExampleDispatcherServlet()), "/*");
>
>
> Set<AnnotationParser.Handler> handlers = new HashSet<>(); handlers.add(new
> WebServletAnnotationHandler(contextHandler)); handlers.add(new
> WebFilterAnnotationHandler(contextHandler)); handlers.add(new
> WebListenerAnnotationHandler(contextHandler));
>
> AnnotationParser annotationParser = new AnnotationParser(); annotationParser.parse(handlers,
> ExampleDispatcherServlet.class.getName(), new ClassNameResolver() { @Override public boolean
> shouldOverride(String name) { return false; } @Override public boolean isExcluded(String name)
> { return false; } });
>
> server.start();
>
>
> The @WebInitParams were recognized, the servlet was loaded on startup. But no Multipart
> support. What will do the trick? I could manually add Multipart support with this hack:
>
>
> WebAppContext contextHandler = new WebAppContext() { @Override public void doHandle(String
> target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws
> IOException, ServletException { String contentType = request.getHeader("Content-Type");
> if(contentType != null && contentType.startsWith("multipart/form-data")) {
> baseRequest.setAttribute(Request.__MULTIPART_CONFIG_ELEMENT, new
> MultipartConfigElement(System.getProperty("java.io.tmpdir"))); }
>
> super.doHandle(target, baseRequest, request, response); } };
>
>
> but it doesn't feel like a final solution.
>
> by the way - is it planed to scan servlet 3.0 annotations by Jetty inside the addServlet(..)
> methods in the future? It's a gap, isn't it?
>
>
> Christian
>
>
> On 16.01.2015 16:50, Joakim Erdfelt wrote:
>> Traditionally annotation scanning is part of the WebApp layer. Embedded Jetty focuses on
>> direct declarations.
>
>> Johannes Brodwall's solution is creative, but only addresses a small subset of what, and
>> how, annotations can be wired up. (which might be sufficient in most cases) Examples: *
>> There's no good way to handle @HandlesType and ServletContainerInitializer his way. * There's
>> no support for @MultipartConfig without a WebAppContext.metadata to hold that information *
>> There's no support for @ServletSecurity without a WebAppContext.metadata to hold that
>> information
>
>> Your example, however, uses @MultipartConfig, which is something that belongs in the
>> WebAppContext's metadata. That information, found during annotation scanning, isn't retained
>> in a ServletContextHandler.
>
>
>> -- Joakim Erdfelt <joakim@xxxxxxxxxxx <mailto:joakim@xxxxxxxxxxx> <mailto:joakim@xxxxxxxxxxx
> <mailto:joakim@xxxxxxxxxxx>>> webtide.com <http://webtide.com>
>> <http://www.webtide.com/> - intalio.com/jetty <http://intalio.com/jetty>
> <http://intalio.com/jetty> Expert advice,
>> services and support from from the Jetty & CometD experts eclipse.org/jetty
>> <http://eclipse.org/jetty> <http://eclipse.org/jetty/> - cometd.org <http://cometd.org>
>> <http://cometd.org/>
>
>> On Fri, Jan 16, 2015 at 7:26 AM, Christian Reuschling <reuschling@xxxxxxxxxxxxxx
>> <mailto:reuschling@xxxxxxxxxxxxxx> <mailto:reuschling@xxxxxxxxxxxxxx
>> <mailto:reuschling@xxxxxxxxxxxxxx>>> wrote:
>
>> Hi,
>
>> we have no war file, nor some extra classpath, but simply want to add our servlet object
>> instance to the embedded server, by taking it's servlet 3.0 parameters into account.
>
>> All the documentation on Jetty, and all examples and snippets we found for embedded +
>> servlet 3.0 annotations deals with specifying a war file or a classpath, which will be
>> scanned by AnnotationConfiguration then.
>
>> We tried a lot, but we were not able to do the same by simply adding the servlet with
>> context.addServlet().
>
>> Here is our code:
>
>
>> Server server = new Server(iPort);
>
>> // tried: ServletHandler handler = new ServletHandler(); // tried: WebAppContext
>> contextHandler = new WebAppContext(); ServletContextHandler contextHandler = new
>> ServletContextHandler(); contextHandler.setContextPath("/");
>
>> // tried: contextHandler.setConfigurations(new Configuration[] { // new
>> AnnotationConfiguration() }); // tried: contextHandler.setConfigurationDiscovered(true);
>
>> contextHandler.addServlet(new ServletHolder(new ExampleServlet()), "/*");
>> server.setHandler(contextHandler);
>
>> server.start();
>
>
>> The Servlet is a simple HttpServlet with following annotations:
>
>> @WebServlet(urlPatterns = { "/example/*" }, loadOnStartup = 1, initParams = {
>> @WebInitParam(name = "name1", value = "val1"), @WebInitParam(name = "name2", value = "val2")
>> }) @MultipartConfig(fileSizeThreshold = 1024*1024*10) public class ExampleServlet extends
>> HttpServlet {....}
>
>
>
>> How is it possible that the embedded Jetty server simply takes the annotations of the
>> Servlet Object added to the server with context/handler.addServlet(..) into account, and
>> nothing else, as the most simple scenario.
>
>
>> Thanks for all answers!
>
>> Christian
>
>
>
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______________________________________________________________________________
Christian Reuschling, Dipl.-Ing.(BA)
Software Engineer
Knowledge Management Department
German Research Center for Artificial Intelligence DFKI GmbH
Trippstadter Straße 122, D-67663 Kaiserslautern, Germany
Phone: +49.631.20575-1250
mailto:reuschling@xxxxxxx http://www.dfki.uni-kl.de/~reuschling/
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