java - 缺少方法 public void 的依赖关系

Question

我有这个代码:

@Path("/automation/devices")
@Singleton
public class DevicesWebService {
    private AppiumServerManager appiumServerManager;
    private AdbService adbService;
    private DevicesService deviceService;

    public DevicesWebService() {
        this(new AdbServiceLocal(), new AppiumServerManagerLocal());
    }

    @VisibleForTesting
    public DevicesWebService(AdbService adbService, AppiumServerManagerLocal AppiumServerManager) {
        this.adbService = adbService;
        this.appiumServerManager = AppiumServerManager;
    }


    @GET
    @Produces(MediaType.TEXT_PLAIN)
    public String getMessage() {
        return "welocme to devices web-service";
    }

    @POST
    @Consumes({MediaType.APPLICATION_JSON})
    @Produces({MediaType.TEXT_PLAIN})
    @Path("/acquireDevice/{device}/{port}")
    public Response acquireDevice(@PathParam("device") Device device, @PathParam("port") Integer port) throws
            Exception {
        try {
            deviceService.acquireDevice(device, port);
        } catch (RuntimeException e) {
            return Response.status(Response.Status.NOT_FOUND).build();
        }
        return Response.status(Response.Status.OK).build();

    }
//
    public static void main(String[] args) throws IOException {
        HttpServer server = HttpServerFactory.create("http://localhost:9998/");
        server.start();
        System.out.println("Server running");
        System.out.println("Visit: http://localhost:9998/automation/devices");
    }
}

我的代码在运行时失败，出现以下异常:

Mar 20, 2016 12:37:51 PM com.sun.jersey.api.core.ScanningResourceConfig logClasses
INFO: Root resource classes found:
  class com.m.mobileautomation.devices.webServices.DevicesWebService
  class com.m.mobileautomation.MobileAutomationWebService
Mar 20, 2016 12:37:51 PM com.sun.jersey.api.core.ScanningResourceConfig logClasses
INFO: Provider classes found:
  class org.codehaus.jackson.jaxrs.JacksonJaxbJsonProvider
  class org.codehaus.jackson.jaxrs.JacksonJsonProvider
  class org.codehaus.jackson.jaxrs.JsonMappingExceptionMapper
  class org.codehaus.jackson.jaxrs.JsonParseExceptionMapper
Mar 20, 2016 12:37:51 PM com.sun.jersey.server.impl.application.WebApplicationImpl _initiate
INFO: Initiating Jersey application, version 'Jersey: 1.19 02/11/2015 05:39 AM'
Mar 20, 2016 12:37:52 PM com.sun.jersey.spi.inject.Errors processErrorMessages
SEVERE: The following errors and warnings have been detected with resource and/or provider classes:
  SEVERE: Missing dependency for method public javax.ws.rs.core.Response com.m.mobileautomation.devices.webServices.DevicesWebService.acquireDevice(com.m.mobileautomation.devices.dataModel.Device,java.lang.Integer) throws java.lang.Exception at parameter at index 0
  SEVERE: Method, public javax.ws.rs.core.Response com.m.mobileautomation.devices.webServices.DevicesWebService.acquireDevice(com.m.mobileautomation.devices.dataModel.Device,java.lang.Integer) throws java.lang.Exception, annotated with POST of resource, class com.m.mobileautomation.devices.webServices.DevicesWebService, is not recognized as valid resource method.
Exception in thread "main" com.sun.jersey.spi.inject.Errors$ErrorMessagesException
    at com.sun.jersey.spi.inject.Errors.processErrorMessages(Errors.java:170)
    at com.sun.jersey.spi.inject.Errors.postProcess(Errors.java:136)
    at com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:199)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:795)
    at com.sun.jersey.api.container.ContainerFactory.createContainer(ContainerFactory.java:172)
    at com.sun.jersey.api.container.ContainerFactory.createContainer(ContainerFactory.java:264)
    at com.sun.jersey.api.container.ContainerFactory.createContainer(ContainerFactory.java:246)
    at com.sun.jersey.api.container.httpserver.HttpServerFactory.create(HttpServerFactory.java:117)
    at com.sun.jersey.api.container.httpserver.HttpServerFactory.create(HttpServerFactory.java:92)
    at com.m.mobileautomation.devices.webServices.DevicesWebService.main(DevicesWebService.java:86)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)

如果我注释掉 public Response acquireDevice 一切正常。

我也尝试删除 `` 但仍然出现错误:

SEVERE: The following errors and warnings have been detected with resource and/or provider classes:
  SEVERE: Missing dependency for method public void com.m.mobileautomation.devices.webServices.DevicesWebService.acquireDevice(com.m.mobileautomation.devices.dataModel.Device,java.lang.Integer) throws java.lang.Exception at parameter at index 0
  SEVERE: Method, public void com.m.mobileautomation.devices.webServices.DevicesWebService.acquireDevice(com.m.mobileautomation.devices.dataModel.Device,java.lang.Integer) throws java.lang.Exception, annotated with POST of resource, class com.m.mobileautomation.devices.webServices.DevicesWebService, is not recognized as valid resource method.
Exception in thread "main" com.sun.jersey.spi.inject.Errors$ErrorMessagesException
    at com.sun.jersey.spi.inject.Errors.processErrorMessages(Errors.java:170)
    at com.sun.jersey.spi.inject.Errors.postProcess(Errors.java:136)
    at com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:199)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:795)
    at com.sun.jersey.api.container.ContainerFactory.createContainer(ContainerFactory.java:172)
    at com.sun.jersey.api.container.ContainerFactory.createContainer(ContainerFactory.java:264)
    at com.sun.jersey.api.container.ContainerFactory.createContainer(ContainerFactory.java:246)
    at com.sun.jersey.api.container.httpserver.HttpServerFactory.create(HttpServerFactory.java:117)
    at com.sun.jersey.api.container.httpserver.HttpServerFactory.create(HttpServerFactory.java:92)
    at com.waze.mobileautomation.devices.webServices.DevicesWebService.main(DevicesWebService.java:87)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)

我该如何解决这个问题？

Answer 1

正如 @peeskillet 所说，@PathParam 不应该用于传递对象，因为它更常用于指定一个变量，您将使用该变量来标识您所操作的资源/对象(例如在你的情况我可能会使用 acquireDevice/{deviceId}/{port} 如果说，id 事先有任何意义)。

当您测试或需要查看日志中发生的情况时，像现在这样使用它也可能会真正混淆一些内容 - 想想中间带有 json 的条目在您的应用程序访问中会是什么样子日志。

如果你想传递对象，你绝对应该使用请求的主体 - 还要注意 jackson (我看到你标记了它，所以我假设这就是你在 Jersey 中使用的)也必须知道如何反序列化该对象否则你也会失败。