Question

尝试创建自定义@Context我可以通过Jersey注入我的资源。

这在this question中的Java中有所介绍。我已经阅读了同样使用Java的docs covering this。最后一些代码覆盖了相同的topic (doing this all through Dropwizard) in Github。

第一部分是创建工厂。

Scala的：

import org.glassfish.hk2.api.Factory
import javax.inject.Inject
import javax.ws.rs.container.ContainerRequestContext
import MyObj

class MyObjFactory @Inject()(ctr: ContainerRequestContext) extends Factory[MyObj] {
  private final val context: ContainerRequestContext = ctr

  override def provide(): MyObj = context.getProperty("myObj").asInstanceOf[MyObj]

  override def dispose(myObj: MyObj): Unit = { }
}

下一部分是注册工厂，我假设classOf[T]是与Java T.class

相当的Scala。

import org.glassfish.hk2.utilities.binding.AbstractBinder

environment.jersey.register(new AbstractBinder {
  override def configure(): Unit = {
    bindFactory(classOf[MyObjFactory])
        .to(classOf[MyObj])
        .proxy(true)
        .proxyForSameScope(false)
        .in(classOf[RequestScoped])
  }
})

最后应该是实际注射：

@Path("/")
class MyResource {
    @GET
    def get(@Context uriInfo: UriInfo, @Context myObjFactory: MyObjFactory) = {
        // do stuff
    }
}

这全部编译但在运行时失败并出现以下异常

ERROR [2017-04-05 00:26:14,605] io.dropwizard.jersey.errors.LoggingExceptionMapper: Error handling a request: 8e5877857c823fef
! java.lang.IllegalArgumentException: Invalid injectee with required type of null passed to getInjecteeDescriptor
! ... 87 common frames omitted
! Causing: org.glassfish.hk2.api.MultiException: A MultiException has 1 exceptions.  They are:
! 1. java.lang.IllegalArgumentException: Invalid injectee with required type of null passed to getInjecteeDescriptor
! 
! at org.jvnet.hk2.internal.ServiceLocatorImpl.internalGetInjecteeDescriptor(ServiceLocatorImpl.java:545)
! at org.jvnet.hk2.internal.ServiceLocatorImpl.getInjecteeDescriptor(ServiceLocatorImpl.java:584)
! at org.glassfish.jersey.internal.inject.ContextInjectionResolver$1.compute(ContextInjectionResolver.java:102)
! at org.glassfish.jersey.internal.inject.ContextInjectionResolver$1.compute(ContextInjectionResolver.java:98)
! at org.glassfish.hk2.utilities.cache.Cache$OriginThreadAwareFuture$1.call(Cache.java:97)

无法判断我是否在转换为Scala时犯了错误，或者我在注册Binder时遇到了错误。

Answer 1

get(@Context uriInfo: UriInfo, @Context myObjFactory: MyObjFactory) <===

您正在尝试注入Factory。 Factory用于创建服务。在这种情况下不打算注入。您要注入的是实际服务，工厂将用于在场景后面创建它

get(@Context uriInfo: UriInfo, @Context myOb: MyObj) <===

Dropwizard / Jersey / HK2依赖注射Scala

1 个答案: