无法让Jetty扫描带注释的类

Question

我有一个嵌入式jetty服务器的应用程序,我就是这样开始的(放在main()中并使用eclipse启动):

Server server = new Server(port);

WebAppContext context = new WebAppContext();
context.setResourceBase("web/");
context.setDescriptor("web/WEB-INF/web.xml");
context.setConfigurations(new Configuration[]{
            new AnnotationConfiguration(), new WebXmlConfiguration(),
            new WebInfConfiguration(), new TagLibConfiguration(),
            new PlusConfiguration(), new MetaInfConfiguration(),
            new FragmentConfiguration(), new EnvConfiguration()});

context.setContextPath("/");
context.setParentLoaderPriority(true);
server.setHandler(context);
server.start();
server.join();

我的web.xml看起来像这样(现在是空的,我不确定我是否可以完全删除它):

<web-app 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    metadata-complete="false"
    version="3.0">
</web-app>

我有一个简单的类设置如下:

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(urlPatterns={"/test"})
public class TestServlet extends HttpServlet {

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException  {
        request.getRequestDispatcher("/WEB-INF/html/index.html").forward(request,response);
    }
}

当我在web.xml中使用传统的servlet映射时,我的应用程序工作正常.但是当我删除web.xml映射并使用注释时,我只能获得404.看起来它根本不是在扫描注释.控制台看起来像这样:

2012-08-01 17:40:37.021:INFO:oejs.Server:jetty-8.1.5.v20120716
2012-08-01 17:40:37.227:INFO:oejpw.PlusConfiguration:No Transaction manager found - if your webapp requires one, please configure one.
2012-08-01 17:40:37.294:INFO:oejsh.ContextHandler:started o.e.j.w.WebAppContext{/,file:/Users/me/project/web/}
2012-08-01 17:40:37.547:INFO:oejsh.ContextHandler:started o.e.j.w.WebAppContext{/,file:/Users/me/project/web/}
2012-08-01 17:40:37.547:INFO:oejsh.ContextHandler:started o.e.j.w.WebAppContext{/,file:/Users/me/project/web/}
2012-08-01 17:40:37.547:INFO:oejsh.ContextHandler:started o.e.j.w.WebAppContext{/,file:/Users/me/project/web/}
2012-08-01 17:40:37.641:INFO:oejs.AbstractConnector:Started SelectChannelConnector@0.0.0.0:8080

我已经从我的研究中检查了一些事情:

• servlet-3.0 jar在类路径中
• metadata-complete在web.xml中设置为false
• 我确保在Web应用程序上下文中包含AnnotationConfiguration

我已经没有想法了,我只想恢复到旧的web.xml,但这让我无法解决为什么我无法让它工作.

Answer 1

更新:2015年6月

Jetty 9和Servlet 3.1的示例项目已更新

请参阅:https://github.com/jetty-project/embedded-servlet-3.1

原答案:

根据您的描述和我使用您的代码掀起的示例项目,您正在正确地完成所有工作.

示例项目:https://github.com/jetty-project/embedded-servlet-3.0

为了实现这一点,您需要以下内容(仅提及此问题,因为您的问题未包含此详细信息)

• JDK 1.6+
• 来自Jetty 8.1.x(或更新版本)的jetty-webapps jar(+依赖项)
• 来自Jetty 8.1.x(或更新版本)的jetty-annotations jar(+依赖项)

仅从这些有限的要求,您将看到以下依赖列表.

$ mvn dependency:tree
[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building sample-webapp 1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-dependency-plugin:2.1:tree (default-cli) @ sample-webapp ---
[INFO] com.company.sample:sample-webapp:war:1-SNAPSHOT
[INFO] +- org.eclipse.jetty.orbit:javax.servlet:jar:3.0.0.v201112011016:provided
[INFO] +- org.eclipse.jetty:jetty-webapp:jar:8.1.5-SNAPSHOT:test
[INFO] |  +- org.eclipse.jetty:jetty-xml:jar:8.1.5-SNAPSHOT:test
[INFO] |  |  \- org.eclipse.jetty:jetty-util:jar:8.1.5-SNAPSHOT:test
[INFO] |  \- org.eclipse.jetty:jetty-servlet:jar:8.1.5-SNAPSHOT:test
[INFO] |     \- org.eclipse.jetty:jetty-security:jar:8.1.5-SNAPSHOT:test
[INFO] |        \- org.eclipse.jetty:jetty-server:jar:8.1.5-SNAPSHOT:test
[INFO] |           +- org.eclipse.jetty:jetty-continuation:jar:8.1.5-SNAPSHOT:test
[INFO] |           \- org.eclipse.jetty:jetty-http:jar:8.1.5-SNAPSHOT:test
[INFO] |              \- org.eclipse.jetty:jetty-io:jar:8.1.5-SNAPSHOT:test
[INFO] \- org.eclipse.jetty:jetty-annotations:jar:8.1.5-SNAPSHOT:test
[INFO]    +- org.eclipse.jetty:jetty-plus:jar:8.1.5-SNAPSHOT:test
[INFO]    |  +- org.eclipse.jetty.orbit:javax.transaction:jar:1.1.1.v201105210645:test
[INFO]    |  \- org.eclipse.jetty:jetty-jndi:jar:8.1.5-SNAPSHOT:test
[INFO]    |     \- org.eclipse.jetty.orbit:javax.mail.glassfish:jar:1.4.1.v201005082020:test
[INFO]    |        \- org.eclipse.jetty.orbit:javax.activation:jar:1.1.0.v201105071233:test
[INFO]    +- org.eclipse.jetty.orbit:javax.annotation:jar:1.1.0.v201108011116:test
[INFO]    \- org.eclipse.jetty.orbit:org.objectweb.asm:jar:3.1.0.v200803061910:test
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.771s
[INFO] Finished at: Fri Aug 10 18:17:46 MST 2012
[INFO] Final Memory: 6M/180M
[INFO] ------------------------------------------------------------------------

您很可能只是缺少依赖项或JDK要求.

Answer 2

AnntationConfiguration类通过其scanForAnnotations(WebAppContext)方法扫描注释.在方法AnnotationConfiguration类中扫描以下路径.

• 容器罐
• WEB-INF/classes目录
• WEB-INF /库

因此,如果您希望src/main/java扫描生产代码中的servlet类(即目录中的源代码),请将生产代码添加到WebAppContext元数据中WEB-INF/classes.

尝试下面的代码,将代码添加到WebAppContext元数据中.

URL classes = getClass()
        .getProtectionDomain()
        .getCodeSource()
        .getLocation();

WebAppContext context = new WebAppContext();
context.getMetaData()
    .setWebInfClassesDirs(
        Arrays.asList(Resource.newResource(classes)));

Answer 3

我有同样的问题，但经过多次阅读后，我得到了解决方案！重要提示：请记住在您的构建路径中包含以下 jars：

jetty-all-9.0.6.v20130930.jar

jetty-annotations-9.0.6.v20130930.jar

org.objectweb.asm-3.1.0.v200803061910.jar

javax.servlet-api-3.0.1.jar

jetty-plus-9.0.6.v20130930.jar

public class Main {

   public static void main(String[] args) throws Exception {

       //Create the server
       Server server = new Server(8080);

       ClassList clist = ClassList.setServerDefault(server);

       //clist.addAfter("org.eclipse.jetty.webapp.FragmentConfiguration", "org.eclipse.jetty.plus.webapp.EnvConfiguration",    "org.eclipse.jetty.plus.webapp.PlusConfiguration");
       clist.addBefore(JettyWebXmlConfiguration.class.getName(), AnnotationConfiguration.class.getName());

       //Here is the trick to scan current classpath!
       webapp.setAttribute("org.eclipse.jetty.server.webapp.ContainerIncludeJarPattern", 
            ".*/build/classes/");

       webapp.setContextPath("/");
       webapp.setResourceBase("./WebContent");


       server.setHandler(webapp);

       server.start();
       server.join();

   }

}