今天，我有了构建一个非常简单的 Web 应用程序的想法，该应用程序将由 REST 后端提供支持。因为我想要一个非常轻量级的服务器，所以我开始关注 Jetty。因为我想尝试另一种 JAX-RS 实现而不是 Jersey，所以我查看了 RestEasy。我认为这两个很容易实现。我错了...
我导入了基本的 Jetty 服务器和 servlet 依赖项，因为我认为这是基本（仅限 REST）Jetty 服务器的唯一服务器要求（我尝试使用 webapp 依赖项；这给出了相同的错误）。
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-server</artifactId>
<version>9.0.0.RC0</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-servlet</artifactId>
<version>9.0.0.RC0</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-servlets</artifactId>
<version>9.0.0.RC0</version>
<scope>compile</scope>
</dependency>
然后我导入了基本的 RestEasy 依赖项。
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxrs</artifactId>
<version>3.0.1.Final</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxb-provider</artifactId>
<version>3.0.1.Final</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>async-http-servlet-3.0</artifactId>
<version>3.0.1.Final</version>
<scope>compile</scope>
</dependency>
主要方法：
public class ExampleActivator {
public static void main(String args[]) throws Exception {
Server server = new Server(8080);
ServletContextHandler context = new ServletContextHandler(ServletContextHandler.NO_SESSIONS);
context.setContextPath("/");
ServletHolder h = new ServletHolder(new HttpServlet30Dispatcher());
h.setInitParameter("javax.ws.rs.Application", "packages.ExampleResources");
context.addServlet(h, "/*");
server.setHandler(context);
server.start();
server.join();
}
}
示例资源：
public class ExampleResources extends Application {
private static final ImmutableSet services = ImmutableSet.of(
ExampleResourceImpl.class
);
@Override
public Set<Class<?>> getClasses() {
return services;
}
}
ExampleResourceImpl：
@Path("activities")
public class ExampleResourceImpl {
@GET
@Produces(MediaType.TEXT_PLAIN)
public String getAll() {
return "Hello World";
}
}
当我转到 webapge 时，我得到以下跟踪：
250 [main] INFO org.eclipse.jetty.server.Server - jetty-9.0.0.RC0
911 [main] INFO org.jboss.resteasy.spi.ResteasyDeployment - Deploying javax.ws.rs.core.Application: class packages.ExampleResources
939 [main] INFO org.jboss.resteasy.spi.ResteasyDeployment - Adding class resource packages.ExampleResourceImpl from Application class packages.ExampleResources
1005 [main] INFO org.eclipse.jetty.server.handler.ContextHandler - started o.e.j.s.ServletContextHandler@702ab48{/,null,AVAILABLE}
1037 [main] INFO org.eclipse.jetty.server.ServerConnector - Started ServerConnector@465ed596{HTTP/1.1}{0.0.0.0:8080}
6315 [qtp84346444-13] WARN org.eclipse.jetty.servlet.ServletHandler - Error for /activities
java.lang.NoSuchMethodError: org.jboss.resteasy.specimpl.BuiltResponse.getHeaders()Ljavax/ws/rs/core/MultivaluedMap;
at org.jboss.resteasy.core.ServerResponseWriter.setDefaultContentType(ServerResponseWriter.java:195)
at org.jboss.resteasy.core.ServerResponseWriter.writeNomapResponse(ServerResponseWriter.java:46)
at org.jboss.resteasy.core.SynchronousDispatcher.writeResponse(SynchronousDispatcher.java:411)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:376)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:179)
at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:220)
at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:56)
at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:51)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:671)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:448)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1070)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:375)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1004)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:136)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:449)
at org.eclipse.jetty.server.HttpChannel.run(HttpChannel.java:246)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:265)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.run(AbstractConnection.java:240)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:589)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:520)
at java.lang.Thread.run(Thread.java:722)
通常这意味着我忘记了依赖，但是我真的不知道发生了什么。