Java Spring中的NPE集成日志处理程序

我面临着一些奇怪的NPE，没有任何由

org.springframework.integration.handler.LoggingHandler

抛出的细节。前一个日志条目是2分钟之前，这也很奇怪

有人知道这背后的原因吗

2017-07-25 18:33:38.561 DEBUG o.s.b.f.s.DefaultListableBeanFactory     : Returning cached instance of singleton bean 'markEodPositionsAsProcessedChannel'
2017-07-25 18:35:36.985 ERROR o.s.integration.handler.LoggingHandler   : org.springframework.messaging.MessageHandlingException: nested exception is java.lang.NullPointerException
            at org.springframework.integration.handler.MethodInvokingMessageProcessor.processMessage(MethodInvokingMessageProcessor.java:96)
            at org.springframework.integration.handler.ServiceActivatingHandler.handleRequestMessage(ServiceActivatingHandler.java:89)
            at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:109)
            at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:127)
            at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:116)
            at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:148)
            at org.springframework.integration.dispatcher.UnicastingDispatcher.access$000(UnicastingDispatcher.java:53)
            at org.springframework.integration.dispatcher.UnicastingDispatcher$3.run(UnicastingDispatcher.java:129)
            at org.springframework.integration.util.ErrorHandlingTaskExecutor$1.run(ErrorHandlingTaskExecutor.java:55)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
            at java.lang.Thread.run(Unknown Source)
    Caused by: java.lang.NullPointerException

---

您谈论的代码如下所示：

public T processMessage(Message<?> message) {
    try {
        return this.delegate.process(message);
    }
    catch (Exception e) {
        throw new MessageHandlingException(message, e);
    }
}

public T processMessage（消息消息消息）{
试一试{
返回此.delegate.process（消息）；
}
捕获（例外e）{
抛出新的MessageHandlingException（message，e）；
}
}

这显然意味着

delegate.process（）

以某种方式抛出

NPE

根据StackTrace，您有一些服务激活器来调用POJO服务方法。看起来你的方法已经抛出了

NPE

我还认为，在

之后的StackTrace中还有其他原因：java.lang.NullPointerException

您在日志中将其视为一个

错误

，因为您有一些从某个源入站通道适配器开始的轮询流。任何向下抛出的异常都被轮询器Ednpoint中的错误处理程序捕获，并以

LoggingHandler

作为默认订户发送到

errorChannel

有关更多信息，请参阅