Spring integration setOnFailureExpression不适用于#根和#异常

这是意料之中的事

逻辑是这样的：

payload: org.springframework.integration.handler.advice.ExpressionEvaluatingRequestHandlerAdvice$MessageHandlingExpressionEvaluatingAdviceException: Handler Failed; nested exception is org.springframework.messaging.MessageHandlingException: error occurred in message handler [rtwFtpOutboundHandler]; nested exception is org.springframework.messaging.MessagingException: Failed to execute on session; nested exception is org.springframework.integration.util.PoolItemNotAvailableException: Failed to obtain pooled item, failedMessage=GenericMessage [payload=sample.pdf, headers={file_name=sample.pdf, TRANSIT_PATHS=[\\localhost\atala-capture-upload, sample.tif], SOURCE=\\localhost\atala-capture-upload, file_originalFile=\\localhost\atala-capture-upload\sample.tif, id=746728a4-9b9e-847f-6c2c-29aa8a4a5fd6, file_relativePath=sample.tif, timestamp=1549922458296}], failedMessage=GenericMessage [payload=sample.pdf, headers={file_name=sample.pdf, TRANSIT_PATHS=[\\localhost\atala-capture-upload, sample.tif], SOURCE=\\localhost\atala-capture-upload, file_originalFile=\\localhost\atala-capture-upload\sample.tif, id=746728a4-9b9e-847f-6c2c-29aa8a4a5fd6, file_relativePath=sample.tif, timestamp=1549922458296}]

试试看{
evalResult=this.onFailureExpression.getValue（PrepareEvaluationContextouse（异常），消息）；
}
捕获（例外e）{
evalResult=e；
logger.error（“针对“+message+”：“+e.getMessage（）”）的失败表达式计算失败）；
}
DestinationResolver channelResolver=getChannelResolver（）；
if（this.failureChannel==null&&this.failureChannelName！=null&&channelResolver！=null）{
this.failureChannel=channelResolver.resolveDestination（this.failureChannelName）；
}
if（evalResult！=null&&this.failureChannel！=null）{
MessaginException MessaginException=
新MessageHandlingExpressionEvaluatingAdviceException（消息“处理程序失败”，
如有必要（例外情况），可取消包装（evalResult）；
ErrorMessage ErrorMessage=新的ErrorMessage（MessaginException）；
this.messagingTemplate.send（this.failureChannel，errorMessage）；
}

onFailureExpression

的计算结果将作为属性添加到

messagehandlingexpressionevaluationingadviceexception

中。此异常被包装到

错误消息

，发送到配置的

故障通道

因此，到目前为止，您的代码是正确的，除非您忽略了这样一个事实，即您在

rtwFtpFailureHandlerFlow

中处理的消息的

payload

正是所提到的

MessageHandlingExpressionEvaluatingAdviceException

。要访问表达式的结果，需要对此异常强制转换一个

有效负载

，并调用其

getEvaluationResult（）

。另一方面，您甚至不需要任何复杂的表达式，因为请求消息作为此异常的

failedMessage

可用。另外，真正的失败是这个异常的原因

有关更多信息，请参阅文档：

payload: org.springframework.integration.handler.advice.ExpressionEvaluatingRequestHandlerAdvice$MessageHandlingExpressionEvaluatingAdviceException: Handler Failed; nested exception is org.springframework.messaging.MessageHandlingException: error occurred in message handler [rtwFtpOutboundHandler]; nested exception is org.springframework.messaging.MessagingException: Failed to execute on session; nested exception is org.springframework.integration.util.PoolItemNotAvailableException: Failed to obtain pooled item, failedMessage=GenericMessage [payload=sample.pdf, headers={file_name=sample.pdf, TRANSIT_PATHS=[\\localhost\atala-capture-upload, sample.tif], SOURCE=\\localhost\atala-capture-upload, file_originalFile=\\localhost\atala-capture-upload\sample.tif, id=746728a4-9b9e-847f-6c2c-29aa8a4a5fd6, file_relativePath=sample.tif, timestamp=1549922458296}], failedMessage=GenericMessage [payload=sample.pdf, headers={file_name=sample.pdf, TRANSIT_PATHS=[\\localhost\atala-capture-upload, sample.tif], SOURCE=\\localhost\atala-capture-upload, file_originalFile=\\localhost\atala-capture-upload\sample.tif, id=746728a4-9b9e-847f-6c2c-29aa8a4a5fd6, file_relativePath=sample.tif, timestamp=1549922458296}]

try {
        evalResult = this.onFailureExpression.getValue(prepareEvaluationContextToUse(exception), message);
    }
    catch (Exception e) {
        evalResult = e;
        logger.error("Failure expression evaluation failed for " + message + ": " + e.getMessage());
    }
    DestinationResolver<MessageChannel> channelResolver = getChannelResolver();
    if (this.failureChannel == null && this.failureChannelName != null && channelResolver != null) {
        this.failureChannel = channelResolver.resolveDestination(this.failureChannelName);
    }
    if (evalResult != null && this.failureChannel != null) {
        MessagingException messagingException =
                new MessageHandlingExpressionEvaluatingAdviceException(message, "Handler Failed",
                        unwrapThrowableIfNecessary(exception), evalResult);
        ErrorMessage errorMessage = new ErrorMessage(messagingException);
        this.messagingTemplate.send(this.failureChannel, errorMessage);
    }