为什么返回 Transformer null 会抛出异常？

Question

Transformer 抛出返回 null 的异常。我正在获取消息有效负载并在转换器中执行我的业务逻辑。然后，将响应发送到文件输出通道。我也尝试过使用 .handle 方法而不是转换器，但得到一种方式的消息异常。编辑

 @Bean
 IntegrationFlow integrationFlow() {
return IntegrationFlows.from(this.sftpMessageSource()).channel(fileInputChannel()).
        handle(service, "callMethod").channel(fileOutputChannel()).
        handle(orderOutMessageHandler()).get();

}

编辑 2

[ERROR] 2020-06-14 14:49:48.053 [task-scheduler-9] LoggingHandler - java.lang.AbstractMethodError: Method org/springframework/integration/sftp/session/SftpSession.getHostPort()Ljava/lang/String; is abstract
at org.springframework.integration.sftp.session.SftpSession.getHostPort(SftpSession.java)
at org.springframework.integration.file.remote.session.CachingSessionFactory$CachedSession.getHostPort(CachingSessionFactory.java:295)
at org.springframework.integration.file.remote.synchronizer.AbstractInboundFileSynchronizer.copyFileToLocalDirectory(AbstractInboundFileSynchronizer.java:496)
at org.springframework.integration.file.remote.synchronizer.AbstractInboundFileSynchronizer.copyIfNotNull(AbstractInboundFileSynchronizer.java:400)
at org.springframework.integration.file.remote.synchronizer.AbstractInboundFileSynchronizer.transferFilesFromRemoteToLocal(AbstractInboundFileSynchronizer.java:386)
at org.springframework.integration.file.remote.synchronizer.AbstractInboundFileSynchronizer.lambda$synchronizeToLocalDirectory[=11=](AbstractInboundFileSynchronizer.java:349)
at org.springframework.integration.file.remote.RemoteFileTemplate.execute(RemoteFileTemplate.java:437)
at org.springframework.integration.file.remote.synchronizer.AbstractInboundFileSynchronizer.synchronizeToLocalDirectory(AbstractInboundFileSynchronizer.java:348)
at org.springframework.integration.file.remote.synchronizer.AbstractInboundFileSynchronizingMessageSource.doReceive(AbstractInboundFileSynchronizingMessageSource.java:265)
at org.springframework.integration.file.remote.synchronizer.AbstractInboundFileSynchronizingMessageSource.doReceive(AbstractInboundFileSynchronizingMessageSource.java:66)
at org.springframework.integration.endpoint.AbstractFetchLimitingMessageSource.doReceive(AbstractFetchLimitingMessageSource.java:45)
at org.springframework.integration.endpoint.AbstractMessageSource.receive(AbstractMessageSource.java:167)
at org.springframework.integration.endpoint.SourcePollingChannelAdapter.receiveMessage(SourcePollingChannelAdapter.java:250)
at org.springframework.integration.endpoint.AbstractPollingEndpoint.doPoll(AbstractPollingEndpoint.java:359)
at org.springframework.integration.endpoint.AbstractPollingEndpoint.pollForMessage(AbstractPollingEndpoint.java:328)
at org.springframework.integration.endpoint.AbstractPollingEndpoint.lambda$null(AbstractPollingEndpoint.java:275)
at org.springframework.integration.util.ErrorHandlingTaskExecutor.lambda$execute[=11=](ErrorHandlingTaskExecutor.java:57)
at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:50)
at org.springframework.integration.util.ErrorHandlingTaskExecutor.execute(ErrorHandlingTaskExecutor.java:55)
at org.springframework.integration.endpoint.AbstractPollingEndpoint.lambda$createPoller(AbstractPollingEndpoint.java:272)
at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:93)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)
at java.util.concurrent.FutureTask.run(FutureTask.java)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access1(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

Answer 1

转换器设计为始终return回复，因为它是一个转换操作。因此你不能从你的方法中 return null 。你得到单向错误可能是因为你的句柄方法是 void。

为什么返回 Transformer null 会抛出异常？

Why returning Transformer null throws exception?

spring-integration