我在lagom项目中创建了一个模块。我的模块只有卡夫卡消费者消费消息并将消息事件存储在卡桑德拉中。感谢为什么,在我的LagomApplicationLoader
我没有定义任何服务,并初始lagomServer
空与LagomServer.forServices()
。但每当,我开始了我的申请,我得到以下异常:Lagom服务器:java.lang.IllegalArgumentException
java.lang.IllegalArgumentException
at com.lightbend.lagom.scaladsl.server.LagomServer$$anon$2.<init>(LagomServer.scala:35)
at com.lightbend.lagom.scaladsl.server.LagomServer$.forServices(LagomServer.scala:31)
at com.knoldus.consumer.impl.TwitterConsumerApplication.lagomServer$lzycompute(TwitterConsumerLoader.scala:33)
at com.knoldus.consumer.impl.TwitterConsumerApplication.lagomServer(TwitterConsumerLoader.scala:33)
at com.lightbend.lagom.scaladsl.server.LagomApplication.<init>(LagomApplicationLoader.scala:187)
at com.knoldus.consumer.impl.TwitterConsumerApplication.<init>(TwitterConsumerLoader.scala:28)
at com.knoldus.consumer.impl.TwitterConsumerLoader$$anon$1.<init>(TwitterConsumerLoader.scala:25)
at com.knoldus.consumer.impl.TwitterConsumerLoader.loadDevMode(TwitterConsumerLoader.scala:25)
at com.lightbend.lagom.scaladsl.server.LagomApplicationLoader.load(LagomApplicationLoader.scala:54)
at play.core.server.LagomReloadableDevServerStart$$anonfun$mainDev$1$$anon$2$$anonfun$get$1$$anonfun$apply$1$$anonfun$2$$anonfun$3.apply(LagomReloadableDevServerStart.scala:151)
at play.core.server.LagomReloadableDevServerStart$$anonfun$mainDev$1$$anon$2$$anonfun$get$1$$anonfun$apply$1$$anonfun$2$$anonfun$3.apply(LagomReloadableDevServerStart.scala:148)
at play.utils.Threads$.withContextClassLoader(Threads.scala:21)
at play.core.server.LagomReloadableDevServerStart$$anonfun$mainDev$1$$anon$2$$anonfun$get$1$$anonfun$apply$1$$anonfun$2.apply(LagomReloadableDevServerStart.scala:148)
at play.core.server.LagomReloadableDevServerStart$$anonfun$mainDev$1$$anon$2$$anonfun$get$1$$anonfun$apply$1$$anonfun$2.apply(LagomReloadableDevServerStart.scala:124)
at scala.Option.map(Option.scala:146)
at play.core.server.LagomReloadableDevServerStart$$anonfun$mainDev$1$$anon$2$$anonfun$get$1$$anonfun$apply$1.apply(LagomReloadableDevServerStart.scala:124)
at play.core.server.LagomReloadableDevServerStart$$anonfun$mainDev$1$$anon$2$$anonfun$get$1$$anonfun$apply$1.apply(LagomReloadableDevServerStart.scala:122)
at scala.util.Success.flatMap(Try.scala:231)
at play.core.server.LagomReloadableDevServerStart$$anonfun$mainDev$1$$anon$2$$anonfun$get$1.apply(LagomReloadableDevServerStart.scala:122)
at play.core.server.LagomReloadableDevServerStart$$anonfun$mainDev$1$$anon$2$$anonfun$get$1.apply(LagomReloadableDevServerStart.scala:114)
at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)
at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)
at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1402)
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)
我的代码:
class TwitterConsumerLoader extends LagomApplicationLoader {
override def load(context: LagomApplicationContext): LagomApplication =
new TwitterConsumerApplication(context) {
override def serviceLocator = NoServiceLocator
}
override def loadDevMode(context: LagomApplicationContext): LagomApplication =
new TwitterConsumerApplication(context) with LagomDevModeComponents
}
abstract class TwitterConsumerApplication(context: LagomApplicationContext) extends LagomApplication(context)
with CassandraPersistenceComponents with AhcWSComponents with LagomKafkaComponents {
lazy val twitterService = serviceClient.implement[TwitterProducerService]
override lazy val lagomServer = LagomServer.forServices()
override lazy val jsonSerializerRegistry = TwitterSerializerRegistry
persistentEntityRegistry.register(wire[TweetEntity])
wire[TwitterProducerSubscriber]
}
我怎样才能在lagom声明空服务。如果这是不可能的,还有什么其他的选择?因为将来可能需要在本模块中创建一些服务。我该如何解决这个问题?