I'm trying a self-executable WAR package with Jetty. It configures with web.xml by default. If a run-time option is given, I wanted to override web.xml by Java code-level configuration with ServletContextHandler#addServlet, #addEventListener, and ...
Can I ignore web.xml while loading a WAR package?
% java -jar foobar.jar # Use web.xml
% java -jar foobar.jar --customize=something # Use Java code to configure
// Example
WebAppContext webapp = new WebAppContext();
webapp.setWar(warLocation.toExternalForm());
webapp.setContextPath("/");
if ( /* has run-time options */ ) {
webapp.setWar(warLocation.toExternalForm()); // But, no load web.xml!
// Emulates web.xml.
webapp.addEventListener(...);
webapp.setInitParameter("resteasy.role.based.security", "true");
webapp.addFilter(...);
} else {
webapp.setWar(warLocation.toExternalForm()); // Loading web.xml.
}
Additional Question:
Before server.start() is called, classes under WEB-INF/ are not loaded. Can I do some configuration webapp.something() with some classes under WEB-INF/? (E.g. extend WebInfConfiguration or do a similar class-loading that WebInfConfiguration does?)
For example, I'd like to do something like:
webapp.addEventListener(new SomeClassUnderWebInf()));
webapp.addEventListener(someInjector.inject(SomeClassUnderWebInf.class));
before server.start().
Handle the WebAppContext Configuration yourself.
Eg:
private static class SelfConfiguration extends AbstractConfiguration
{
#Override
public void configure(WebAppContext context) throws Exception
{
// Emulates web.xml.
webapp.addEventListener(...);
webapp.setInitParameter("resteasy.role.based.security", "true");
webapp.addFilter(...);
}
}
public static void main(String[] args) throws Exception
{
Server server = new Server(8080);
WebAppContext webapp = new WebAppContext();
webapp.setContextPath("/");
if (useWebXml)
{
webapp.setConfigurationClasses(WebAppContext.getDefaultConfigurationClasses());
}
else
{
webapp.setConfigurations(new Configuration[] {
new SelfConfiguration()
});
}
webapp.setWar("path/to/my/test.war");
webapp.setParentLoaderPriority(true);
server.setHandler(webapp);
server.start();
server.join();
}
I cloned servlet:
https://github.com/eHarmony/vw-webservice . I want to start this servlet from my jetty code. I am using guice to add classes to jetty. It looks like I need to move applicationContext so it works as a jar, not war . I don't have experience with jetty or spring. I would love to hear what you think about it.
GuiceConfig.java
public class GuiceConfig extends GuiceServletContextListener
{
#Override
protected Injector getInjector()
{
return Guice.createInjector(new JerseyServletModule() {
#Override
protected void configureServlets() {
bind(ClassThatProcessRequest.class);
bind(InjecteeInterface.class).to(Injectee.class);
serve("/*").with(GuiceContainer.class);
}
});
}
}
and main.java
public class Main {
public static void main(String[] args) throws Exception {
Server server = new Server(8080);
ServletContextHandler root = new ServletContextHandler(server, "/", ServletContextHandler.SESSIONS);
root.addEventListener(new GuiceConfig());
root.addFilter(GuiceFilter.class, "/*", EnumSet.of(DispatcherType.REQUEST));
root.addServlet(EmptyServlet.class, "/*");
server.start();
}
}
When I start server I get
com.google.inject.CreationException: Guice creation errors:
No implementation for com.eharmony.matching.vw.webservice.core.exampleprocessor.ExampleProcessorFactory was bound.
here is applicationContext.xml and web.xml
https://github.com/eHarmony/vw-webservice/blob/master/vw-webservice-jersey/src/main/webapp/WEB-INF/applicationContext.xml
https://github.com/eHarmony/vw-webservice/blob/master/vw-webservice-jersey/src/main/webapp/WEB-INF/web.xml
I dont understand how i can rewrite this code used with jetty 6 for jetty 9 :
import org.mortbay.jetty.*;
import org.mortbay.jetty.nio.SelectChannelConnector;
import org.mortbay.jetty.webapp.WebAppContext;
public class ApplLauncher {
public static void main(String[] args) {
Server server = new Server();
Connector connector = new SelectChannelConnector();
connector.setPort(8080);
server.addConnector(connector);
WebAppContext root = new WebAppContext("C:\\Users\\OZKA\\IdeaProjects\\projectname\\projectname\\web", "/");
root.setWelcomeFiles(new String[]{"index.html"});
//root.addServlet(new ServletHolder(new TestServlet()), "/test");
server.setHandlers(new Handler[]{root});
try {
server.start();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
The code above works fine and response the static content from the web folder and servlets, mapped in web.xml. Here is my attempts to use embeded jetty 9:
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.webapp.WebAppContext;
import org.eclipse.jetty.server.handler.ResourceHandler;
import org.eclipse.jetty.server.handler.HandlerList;
import org.eclipse.jetty.server.Handler;
public class ApplLauncher {
public static void main(String[] args) {
System.out.println("Hello from ScalaSbt Web Project");
Server server = new Server(8080);
WebAppContext webapp = new WebAppContext("D:\\Dev\\Scala\\ScalaTestProject\\web\\", "/");
ResourceHandler resource_handler = new ResourceHandler();
resource_handler.setWelcomeFiles(new String[]{ "index.html" });
HandlerList handlers = new HandlerList();
handlers.setHandlers(new Handler[] { resource_handler, webapp});
server.setHandler(handlers);
try {
server.start();
server.join();
}
catch(Exception ex) {
ex.printStackTrace();
}
}
}
The server is starting, but index.html request throws error:
"java.lang.NoSuchMethodError: javax.servlet.http.HttpServletRequest.isAsyncStarted()Z"
I tried to find a working example in Google, but found nothing useful. Official samples and documentation is very confusing and I do not understand how i can use embeded jetty version 9.
Error message clearly indicates that you have wrong version of Servlet API in your classpath.
Check your dependencies, you probably have pre-3.0 Servlet API somewhere, it should be removed.
If you are using Gradle the execute
gradle dependencies
analyze the dependency tree and exclude the 'servlet-api' dependencies with version less than 3.0. You can do the following to exclude
compile ('javax.servlet:jsp-api:2.0'){
exclude module : 'servlet-api'
}
There can be multiple dependencies which further include servlet-api-2.x. Exclude all those
Adding on what #axtavt said: if you are using maven add the following depedency:
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>3.0-alpha-1</version>
<scope>provided</scope>
</dependency>
Also do a mvn dependency:tree |grep servlet and double-check that you do not have servlet-api:2.x imported.
I'm trying to create a simple webapp without any XML configuration using Spring 3.1 and an embedded Jetty 8 server.
However, I'm struggling to get Jetty to recognise my implementaton of the Spring WebApplicationInitializer interface.
Project structure:
src
+- main
+- java
| +- JettyServer.java
| +- Initializer.java
|
+- webapp
+- web.xml (objective is to remove this - see below).
The Initializer class above is a simple implementation of WebApplicationInitializer:
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import org.springframework.web.WebApplicationInitializer;
public class Initializer implements WebApplicationInitializer {
#Override
public void onStartup(ServletContext servletContext) throws ServletException {
System.out.println("onStartup");
}
}
Likewise JettyServer is a simple implementation of an embedded Jetty server:
import org.eclipse.jetty.annotations.AnnotationConfiguration;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.webapp.Configuration;
import org.eclipse.jetty.webapp.WebAppContext;
public class JettyServer {
public static void main(String[] args) throws Exception {
Server server = new Server(8080);
WebAppContext webAppContext = new WebAppContext();
webAppContext.setResourceBase("src/main/webapp");
webAppContext.setContextPath("/");
webAppContext.setConfigurations(new Configuration[] { new AnnotationConfiguration() });
webAppContext.setParentLoaderPriority(true);
server.setHandler(webAppContext);
server.start();
server.join();
}
}
My understanding is that on startup Jetty will use AnnotationConfiguration to scan for
annotated implementations of ServletContainerInitializer; it should find Initializer and wire it in...
However, when I start the Jetty server (from within Eclipse) I see the following on the command-line:
2012-11-04 16:59:04.552:INFO:oejs.Server:jetty-8.1.7.v20120910
2012-11-04 16:59:05.046:INFO:/:No Spring WebApplicationInitializer types detected on classpath
2012-11-04 16:59:05.046:INFO:oejsh.ContextHandler:started o.e.j.w.WebAppContext{/,file:/Users/duncan/Coding/spring-mvc-embedded-jetty-test/src/main/webapp/}
2012-11-04 16:59:05.117:INFO:oejs.AbstractConnector:Started SelectChannelConnector#0.0.0.0:8080
The important bit is this:
No Spring WebApplicationInitializer types detected on classpath
Note that src/main/java is defined as a source folder in Eclipse, so should be on the classpath. Also note that the Dynamic Web Module Facet is set to 3.0.
I'm sure there's a simple explanation, but I'm struggling to see the wood for the trees! I suspect the key is with the following line:
...
webAppContext.setResourceBase("src/main/webapp");
...
This makes sense with a 2.5 servlet using web.xml (see below), but what should it be when using AnnotationConfiguration?
NB: Everything fires up correctly if I change the Configurations to the following:
...
webAppContext.setConfigurations(new Configuration[] { new WebXmlConfiguration() });
...
In this case it finds the web.xml under src/main/webapp and uses it to wire the servlet using DispatcherServlet and AnnotationConfigWebApplicationContext in the usual way (completely bypassing the WebApplicationInitializer implementation above).
This feels very much like a classpath problem, but I'm struggling to understand quite how Jetty associates itself with implementations of WebApplicationInitializer - any suggestions would be most appreciated!
For info, I'm using the following:
Spring 3.1.1
Jetty 8.1.7
STS 3.1.0
The problem is that Jetty's AnnotationConfiguration class does not scan non-jar resources on the classpath (except under WEB-INF/classes).
It finds my WebApplicationInitializer's if I register a subclass of AnnotationConfiguration which overrides configure(WebAppContext) to scan the host classpath in addition to the container and web-inf locations.
Most of the sub-class is (sadly) copy-paste from the parent. It includes:
an extra parse call (parseHostClassPath) at the end of the configure method;
the parseHostClassPath method which is largely copy-paste from
AnnotationConfiguration's parseWebInfClasses;
the getHostClassPathResource method which grabs the first non-jar URL
from the classloader (which, for me at least, is the file url to my
classpath in eclipse).
I am using slightly different versions of Jetty (8.1.7.v20120910) and Spring (3.1.2_RELEASE), but I imagine the same solution will work.
Edit: I created a working sample project in github with some modifications (the code below works fine from Eclipse but not when running in a shaded jar) - https://github.com/steveliles/jetty-embedded-spring-mvc-noxml
In the OP's JettyServer class the necessary change would replace line 15 with:
webAppContext.setConfigurations (new Configuration []
{
new AnnotationConfiguration()
{
#Override
public void configure(WebAppContext context) throws Exception
{
boolean metadataComplete = context.getMetaData().isMetaDataComplete();
context.addDecorator(new AnnotationDecorator(context));
AnnotationParser parser = null;
if (!metadataComplete)
{
if (context.getServletContext().getEffectiveMajorVersion() >= 3 || context.isConfigurationDiscovered())
{
parser = createAnnotationParser();
parser.registerAnnotationHandler("javax.servlet.annotation.WebServlet", new WebServletAnnotationHandler(context));
parser.registerAnnotationHandler("javax.servlet.annotation.WebFilter", new WebFilterAnnotationHandler(context));
parser.registerAnnotationHandler("javax.servlet.annotation.WebListener", new WebListenerAnnotationHandler(context));
}
}
List<ServletContainerInitializer> nonExcludedInitializers = getNonExcludedInitializers(context);
parser = registerServletContainerInitializerAnnotationHandlers(context, parser, nonExcludedInitializers);
if (parser != null)
{
parseContainerPath(context, parser);
parseWebInfClasses(context, parser);
parseWebInfLib (context, parser);
parseHostClassPath(context, parser);
}
}
private void parseHostClassPath(final WebAppContext context, AnnotationParser parser) throws Exception
{
clearAnnotationList(parser.getAnnotationHandlers());
Resource resource = getHostClassPathResource(getClass().getClassLoader());
if (resource == null)
return;
parser.parse(resource, new ClassNameResolver()
{
public boolean isExcluded (String name)
{
if (context.isSystemClass(name)) return true;
if (context.isServerClass(name)) return false;
return false;
}
public boolean shouldOverride (String name)
{
//looking at webapp classpath, found already-parsed class of same name - did it come from system or duplicate in webapp?
if (context.isParentLoaderPriority())
return false;
return true;
}
});
//TODO - where to set the annotations discovered from WEB-INF/classes?
List<DiscoveredAnnotation> annotations = new ArrayList<DiscoveredAnnotation>();
gatherAnnotations(annotations, parser.getAnnotationHandlers());
context.getMetaData().addDiscoveredAnnotations (annotations);
}
private Resource getHostClassPathResource(ClassLoader loader) throws IOException
{
if (loader instanceof URLClassLoader)
{
URL[] urls = ((URLClassLoader)loader).getURLs();
for (URL url : urls)
if (url.getProtocol().startsWith("file"))
return Resource.newResource(url);
}
return null;
}
},
});
Update: Jetty 8.1.8 introduces internal changes that are incompatible with the code above. For 8.1.8 the following seems to work:
webAppContext.setConfigurations (new Configuration []
{
// This is necessary because Jetty out-of-the-box does not scan
// the classpath of your project in Eclipse, so it doesn't find
// your WebAppInitializer.
new AnnotationConfiguration()
{
#Override
public void configure(WebAppContext context) throws Exception {
boolean metadataComplete = context.getMetaData().isMetaDataComplete();
context.addDecorator(new AnnotationDecorator(context));
//Even if metadata is complete, we still need to scan for ServletContainerInitializers - if there are any
AnnotationParser parser = null;
if (!metadataComplete)
{
//If metadata isn't complete, if this is a servlet 3 webapp or isConfigDiscovered is true, we need to search for annotations
if (context.getServletContext().getEffectiveMajorVersion() >= 3 || context.isConfigurationDiscovered())
{
_discoverableAnnotationHandlers.add(new WebServletAnnotationHandler(context));
_discoverableAnnotationHandlers.add(new WebFilterAnnotationHandler(context));
_discoverableAnnotationHandlers.add(new WebListenerAnnotationHandler(context));
}
}
//Regardless of metadata, if there are any ServletContainerInitializers with #HandlesTypes, then we need to scan all the
//classes so we can call their onStartup() methods correctly
createServletContainerInitializerAnnotationHandlers(context, getNonExcludedInitializers(context));
if (!_discoverableAnnotationHandlers.isEmpty() || _classInheritanceHandler != null || !_containerInitializerAnnotationHandlers.isEmpty())
{
parser = createAnnotationParser();
parse(context, parser);
for (DiscoverableAnnotationHandler h:_discoverableAnnotationHandlers)
context.getMetaData().addDiscoveredAnnotations(((AbstractDiscoverableAnnotationHandler)h).getAnnotationList());
}
}
private void parse(final WebAppContext context, AnnotationParser parser) throws Exception
{
List<Resource> _resources = getResources(getClass().getClassLoader());
for (Resource _resource : _resources)
{
if (_resource == null)
return;
parser.clearHandlers();
for (DiscoverableAnnotationHandler h:_discoverableAnnotationHandlers)
{
if (h instanceof AbstractDiscoverableAnnotationHandler)
((AbstractDiscoverableAnnotationHandler)h).setResource(null); //
}
parser.registerHandlers(_discoverableAnnotationHandlers);
parser.registerHandler(_classInheritanceHandler);
parser.registerHandlers(_containerInitializerAnnotationHandlers);
parser.parse(_resource,
new ClassNameResolver()
{
public boolean isExcluded (String name)
{
if (context.isSystemClass(name)) return true;
if (context.isServerClass(name)) return false;
return false;
}
public boolean shouldOverride (String name)
{
//looking at webapp classpath, found already-parsed class of same name - did it come from system or duplicate in webapp?
if (context.isParentLoaderPriority())
return false;
return true;
}
});
}
}
private List<Resource> getResources(ClassLoader aLoader) throws IOException
{
if (aLoader instanceof URLClassLoader)
{
List<Resource> _result = new ArrayList<Resource>();
URL[] _urls = ((URLClassLoader)aLoader).getURLs();
for (URL _url : _urls)
_result.add(Resource.newResource(_url));
return _result;
}
return Collections.emptyList();
}
}
});
I was able to resolve in an easier but more limited way by just providing explicitly to the AnnotationConfiguration the implementation class (MyWebApplicationInitializerImpl in this example) that I want to be loaded like this:
webAppContext.setConfigurations(new Configuration[] {
new WebXmlConfiguration(),
new AnnotationConfiguration() {
#Override
public void preConfigure(WebAppContext context) throws Exception {
MultiMap<String> map = new MultiMap<String>();
map.add(WebApplicationInitializer.class.getName(), MyWebApplicationInitializerImpl.class.getName());
context.setAttribute(CLASS_INHERITANCE_MAP, map);
_classInheritanceHandler = new ClassInheritanceHandler(map);
}
}
});
Jetty 9.0.1 contains an enhancement which allows for scanning of annotations of non-jar resources (ie classes) on the container classpath. See comment #5 on the following issue for how to use it:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=404176#c5
Jan
The code below did the trick in my maven project:
public static void main(String[] args) throws Exception {
Server server = new Server();
ServerConnector scc = new ServerConnector(server);
scc.setPort(Integer.parseInt(System.getProperty("jetty.port", "8080")));
server.setConnectors(new Connector[] { scc });
WebAppContext context = new WebAppContext();
context.setServer(server);
context.setContextPath("/");
context.setWar("src/main/webapp");
context.getMetaData().addContainerResource(new FileResource(new File("./target/classes").toURI()));
context.setConfigurations(new Configuration[]{
new WebXmlConfiguration(),
new AnnotationConfiguration()
});
server.setHandler(context);
try {
System.out.println(">>> STARTING EMBEDDED JETTY SERVER, PRESS ANY KEY TO STOP");
System.out.println(String.format(">>> open http://localhost:%s/", scc.getPort()));
server.start();
while (System.in.available() == 0) {
Thread.sleep(5000);
}
server.stop();
server.join();
} catch (Throwable t) {
t.printStackTrace();
System.exit(100);
}
}
Based on my testing and this thread http://forum.springsource.org/showthread.php?127152-WebApplicationInitializer-not-loaded-with-embedded-Jetty I don't think it works at the moment. If you look in AnnotationConfiguration.configure:
parseContainerPath(context, parser);
// snip comment
parseWebInfClasses(context, parser);
parseWebInfLib (context, parser);
it seems coupled to a war-like deployment rather than embedded.
Here is an example using Spring MVC and embedded Jetty that might be more useful:
http://www.jamesward.com/2012/08/13/containerless-spring-mvc
It creates the Spring servlet directly rather then relying on annotations.
To those experiencing this lately, it appears this gets around the issue:
#Component
public class Initializer implements WebApplicationInitializer {
private ServletContext servletContext;
#Autowired
public WebInitializer(ServletContext servletContext) {
this.servletContext = servletContext;
}
#PostConstruct
public void onStartup() throws ServletException {
onStartup(servletContext);
}
public void onStartup(ServletContext servletContext) throws ServletException {
System.out.println("onStartup");
}
}
To make it work on Jetty 9 set attribute AnnotationConfiguration.CLASS_INHERITANCE_MAP on WebAppContext
webAppContext.setAttribute(AnnotationConfiguration.CLASS_INHERITANCE_MAP, createClassMap());
And here is how to create this map:
private ClassInheritanceMap createClassMap() {
ClassInheritanceMap classMap = new ClassInheritanceMap();
ConcurrentHashSet<String> impl = new ConcurrentHashSet<>();
impl.add(MyWebAppInitializer.class.getName());
classMap.put(WebApplicationInitializer.class.getName(), impl);
return classMap;
}
I placed that solution on gitHub
What about just setting the context attribute that tells the scanner which things belong on the container classpath that need to be scanned?
context attribute:
org.eclipse.jetty.server.webapp.ContainerIncludeJarPattern
./servlet-api-[^/].jar$
It is designed to be used with jar names, but you could just match everything.
You'd need to use the WebInfConfiguration as well as the AnnotationConfiguration classes.
cheers
Jan
In our case these lines helped in Jetty startup code:
ClassList cl = Configuration.ClassList.setServerDefault(server);
cl.addBefore("org.eclipse.jetty.webapp.JettyWebXmlConfiguration", "org.eclipse.jetty.annotations.AnnotationConfiguration");
Jetty 9 version of "magomarcelo" answer:
context.setConfigurations(
new org.eclipse.jetty.webapp.Configuration[] { new WebXmlConfiguration(), new AnnotationConfiguration() {
#Override
public void preConfigure(WebAppContext context) throws Exception {
final ClassInheritanceMap map = new ClassInheritanceMap();
final ConcurrentHashSet<String> set = new ConcurrentHashSet<>();
set.add(MyWebAppInitializer.class.getName());
map.put(WebApplicationInitializer.class.getName(), set);
context.setAttribute(CLASS_INHERITANCE_MAP, map);
_classInheritanceHandler = new ClassInheritanceHandler(map);
}
} });
For Jetty 9, if you have webjars, the solution provided does not work straight away as those Jars need to be on the classpath and the JAR contents need to be available as resources for your webapp. So, for that to work together with webjars, the config would have to be:
context.setExtraClasspath(pathsToWebJarsCommaSeparated);
context.setAttribute(WebInfConfiguration.WEBINF_JAR_PATTERN, ".*\\.jar$");
context.setAttribute(WebInfConfiguration.CONTAINER_JAR_PATTERN, ".*\\.jar$");
context.setConfigurations(
new org.eclipse.jetty.webapp.Configuration[] {
new WebInfConfiguration(), new MetaInfConfiguration(),
new AnnotationConfiguration() {
#Override
public void preConfigure(WebAppContext context) throws Exception {
final ClassInheritanceMap map = new ClassInheritanceMap();
final ConcurrentHashSet<String> set = new ConcurrentHashSet<>();
set.add(MyWebAppInitializer.class.getName());
map.put(WebApplicationInitializer.class.getName(), set);
context.setAttribute(CLASS_INHERITANCE_MAP, map);
_classInheritanceHandler = new ClassInheritanceHandler(map);
}
} });
The order here is important (WebInfConfiguration has to come before MetaInf).
Solution that worked for me and does not involve scanning, but uses WebApplicationInitializer class that you provide. Jetty version: 9.2.20
public class Main {
public static void main(String... args) throws Exception {
Properties properties = new Properties();
InputStream stream = Main.class.getResourceAsStream("/WEB-INF/application.properties");
properties.load(stream);
stream.close();
PropertyConfigurator.configure(properties);
WebAppContext webAppContext = new WebAppContext();
webAppContext.setResourceBase("resource");
webAppContext.setContextPath(properties.getProperty("base.url"));
webAppContext.setConfigurations(new Configuration[] {
new WebXmlConfiguration(),
new AnnotationConfiguration() {
#Override
public void preConfigure(WebAppContext context) {
ClassInheritanceMap map = new ClassInheritanceMap();
map.put(WebApplicationInitializer.class.getName(), new ConcurrentHashSet<String>() {{
add(WebInitializer.class.getName());
add(SecurityWebInitializer.class.getName());
}});
context.setAttribute(CLASS_INHERITANCE_MAP, map);
_classInheritanceHandler = new ClassInheritanceHandler(map);
}
}
});
Server server = new Server(Integer.parseInt(properties.getProperty("base.port")));
server.setHandler(webAppContext);
server.start();
server.join();
}
}
The source (in russian) of this code snippet is here: https://habrahabr.ru/post/255773/
did a simple maven project to demonstrate how it can be done cleanly.
public class Console {
public static void main(String[] args) {
try {
Server server = new Server(8080);
//Set a handler to handle requests.
server.setHandler(getWebAppContext());
//starts to listen at 0.0.0.0:8080
server.start();
server.join();
} catch (Exception e) {
log.error("server exited with exception", e);
}
}
private static WebAppContext getWebAppContext() {
final WebAppContext webAppContext = new WebAppContext();
//route all requests via this web-app.
webAppContext.setContextPath("/");
/*
* point to location where the jar into which this class gets packaged into resides.
* this could very well be the target directory in a maven development build.
*/
webAppContext.setResourceBase("directory_where_the_application_jar_exists");
//no web inf for us - so let the scanning know about location of our libraries / classes.
webAppContext.getMetaData().setWebInfClassesDirs(Arrays.asList(webAppContext.getBaseResource()));
//Scan for annotations (servlet 3+)
final AnnotationConfiguration configuration = new AnnotationConfiguration();
webAppContext.setConfigurations(new Configuration[]{configuration});
return webAppContext;
}
}
and that's all - the spring WebApplicationInitializer that you use will get detected without explicitly letting jetty server know about the existence of such an app initializer.
I am new in Java EJB 3.0. It is possible to call a (session) bean—deployed on JBoss—from a desktop application client?
Thanks in advance.
Yes you can. Some specifics are here (references EJB2 but it the same for EJB3 when it comes to remote clients): http://www.theserverside.com/discussions/thread.tss?thread_id=9197
Paraphrased:
Hashtable env = new Hashtable();
env.put("java.naming.factory.initial", "org.jnp.interfaces.NamingContextFactory");
env.put("java.naming.provider.url", "jnp://localhost:1099");
env.put("java.naming.factory.url.pkgs", "org.jboss.naming:org.jnp.interfaces");
Context ctx = new InitialContext(env);
// name is whatever JNDI name you gave it
Object o = ctx.lookup("home name");
EJBHome ejbHome = (EJBHome) PortableRemoteObject.narrow(o,EJBHome.class);
// This is userID should be the one passed.
EJB ejb = ejbHome.create(..);
Yes.
public static void main(String args[]) throws Exception {
InitialContext ctx = new InitialContext();
YourService yourService = (YourService) ctx.lookup("com.example.session.YourService");
String time = yourService.getTime();
System.out.println("Time is: " + time);
}
For client configuration you must provide jndi.properties file with contents
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=localhost
If you are looking for working examples on JBoss try download source code of Enterprise JavaBeans 3.0, Fifth Edition
Let's assume you have the following remote interface:
#Remote
public interface HelloBeanRemote {
public String sayHello();
}
And a session bean implementing it:
#Stateless
public class HelloBean implements HelloBeanRemote {
...
}
And that this EJB is correctly packaged and deployed on JBoss.
On the client side, create a jndi.properties with the following content and put it on the classpath:
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=localhost:1099
Then use the following code to call your EJB:
Context context;
try {
context = new InitialContext();
HelloBeanRemote beanRemote = (HelloBeanRemote)context.lookup("HelloBean/remote");
beanRemote.test();
} catch (NamingException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
Alternatively, if you don't want to provide a jndi.properties file, you can explicitly setup the JNDI environment in the code and create the context like this:
Properties properties = new Properties();
properties.put("java.naming.factory.initial","org.jnp.interfaces.NamingContextFactory");
properties.put("java.naming.factory.url.pkgs","=org.jboss.naming:org.jnp.interfaces");
properties.put("java.naming.provider.url","localhost:1099");
Context context = new InitialContext(properties);
But I'd recommend using the jndi.properties for the sake of portability.
You can also expose the bean as a web service. I believe this is available as of EJB 3. It is quite nice considering you can do it with annotations. You may wish to consider using this option to decrease coupling. Here is a link to a tutorial.