Java Spring 3.1 WebApplicationInitializer&；嵌入式Jetty 8注释配置

我正在尝试使用Spring3.1和嵌入式Jetty8服务器创建一个没有任何XML配置的简单webapp

然而，我正努力让Jetty认可我的SpringWebApplicationInitializer接口的实现

项目结构：

src
 +- main
     +- java
     |   +- JettyServer.java
     |   +- Initializer.java
     | 
     +- webapp
         +- web.xml (objective is to remove this - see below).

上面的Initializer类是WebApplicationInitializer的一个简单实现：

同样，JettyServer是嵌入式Jetty服务器的简单实现：

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();
    }
}

我的理解是，Jetty在启动时将使用AnnotationConfiguration来扫描 ServletContainerInitializer的注释实现；它应该找到初始值设定项并将其连接到

但是，当我启动Jetty服务器（从Eclipse中）时，我会在命令行上看到以下内容：

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

重要的一点是：

No Spring WebApplicationInitializer types detected on classpath

请注意，src/main/java在Eclipse中定义为源文件夹，因此应该位于类路径上。还请注意，动态Web模块方面设置为3.0

我相信有一个简单的解释，但我正在努力看到树木的树木！我怀疑钥匙与以下行有关：

...
webAppContext.setResourceBase("src/main/webapp");
...

这对于使用web.xml的2.5servlet是有意义的（见下文），但是当使用AnnotationConfiguration时应该是什么呢

注意：如果我将配置更改为以下设置，则所有设置都会正确启动：

...
webAppContext.setConfigurations(new Configuration[] { new WebXmlConfiguration() });
...

在本例中，它在src/main/webapp下找到web.xml，并使用它以通常的方式使用DispatcherServlet和AnnotationConfigWebApplicationContext连接servlet（完全绕过上面的WebApplicationInitializer实现）

这感觉很像一个类路径问题，但我很难理解Jetty是如何将自己与WebApplicationInitializer的实现联系在一起的——任何建议都将不胜感激

关于信息，我使用以下内容：

...
webAppContext.setConfigurations(new Configuration[] { new WebXmlConfiguration() });
...

春季3.1.1 码头8.1.7

---

STS3.1.0

基于我的测试和这个线程，我认为它目前不起作用。如果在AnnotationConfiguration.configure中查找：

   parseContainerPath(context, parser);
   // snip comment
   parseWebInfClasses(context, parser);
   parseWebInfLib (context, parser);

它似乎与类似战争的部署相结合，而不是嵌入

下面是一个使用Spring MVC和嵌入式Jetty的示例，可能更有用：

---

它直接创建Spring servlet，而不是依赖于注释。

问题在于Jetty的

AnnotationConfiguration

类不扫描类路径上的非jar资源（WEB-INF/classes下除外）

如果我注册了

AnnotationConfiguration

的子类，它会找到我的

WebApplicationInitializer

，该子类会覆盖

configure（WebAppContext）

以扫描主机类路径以及容器和web inf位置

大多数子类（遗憾的是）都是从父类复制粘贴的。它包括：

• configure方法末尾的额外解析调用（

  parseHostClassPath

  ）

• parseHostClassPath

  方法，主要是从

  AnnotationConfiguration

  的

  parseWebInfClasses

• 获取第一个非jar URL的

  getHostClassPathResource

  方法 从类加载器（至少对我来说，它是我的 eclipse中的类路径）

我使用的Jetty（8.1.7.v20120910）和Spring（3.1.2_发行版）的版本略有不同，但我认为相同的解决方案也会起作用

编辑：我在github中创建了一个工作示例项目，并做了一些修改（下面的代码在Eclipse中可以正常工作，但在着色jar中运行时却不行）——

在OP的JettyServer类中，必要的更改将第15行替换为：

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;                    
            }
        },
    });

webAppContext.setConfigurations（新配置[]
{
新的AnnotationConfiguration（）
{
@凌驾
public void configure（WebAppContext上下文）引发异常
{
布尔metadataComplete=context.getMetaData（）.isMetaDataComplete（）；
addDecorator（新注释decorator（context））；
AnnotationParser=null；
如果（！metadataComplete）
{
if（context.getServletContext（）.getEffectiveMajorVersion（）>=3 | | context.isConfiguration发现（））
{
parser=createAnnotationParser（）；
registerNotationHandler（“javax.servlet.annotation.WebServlet”，新的WebServletAnnotationHandler（上下文））；
registerNotationHandler（“javax.servlet.annotation.WebFilter”，新的WebFilterNotationHandler（上下文））；
registerNotationHandler（“javax.servlet.annotation.WebListener”，新的WebListenerAnnotationHandler（上下文））；
}
}
List nonExcludedInitializers=getNonExcludedInitializers（上下文）；
parser=registerServletContainerInitializerAnnotationHandlers（上下文、解析器、非排除的初始化器）；
if（解析器！=null）
{
parseContainerPath（上下文，解析器）；
ParseWebInfClass（上下文、解析器）；
parseWebInfLib（上下文，解析器）；
parseHostClassPath（上下文，解析器）；
}                  
}
私有void parseHostClassPath（最终WebAppContext上下文，AnnotationParser）引发异常
{
clearAnnotationList（parser.getAnnotationHandlers（））；
Resource Resource=getHostClassPathResource（getClass（）.getClassLoader（））；
if（资源==null）
返回；
parser.parse（资源，新ClassNameResolver（）
{
公共布尔值IsExclude（字符串名称）
{           
if（context.isSystemClass（name））返回true；
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();                 
            }
        }
    });

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);
        }
    }
});

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);
    }

}

    ClassList cl = Configuration.ClassList.setServerDefault(server);
    cl.addBefore("org.eclipse.jetty.webapp.JettyWebXmlConfiguration", "org.eclipse.jetty.annotations.AnnotationConfiguration");

@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");
    }
}

        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);
                }
            } });

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);
            }
        } });

webAppContext.setAttribute(AnnotationConfiguration.CLASS_INHERITANCE_MAP, createClassMap());

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;
}

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();
}
}

    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;
    }
}