在Mule 3.8.5中涉及JSON Payload的Dataweave转换出错

问题描述 投票：1回答：2

我在JSON Payload上使用dataweave转换时遇到错误。 JSON Payload是

{
    "requestId": "13431#1638a2abfb8",
    "result": [
        {
            "batchId": 1028,
            "importId": "1028",
            "status": "Queued"
        }
    ],
    "success": true
}

上面的有效负载由RESTful服务返回，我在使用byteArray到Object转换器之前将其转换为对象，然后应用以下dataweave转换

%dw 1.0
%output application/json
---
batchexecution:
 {
    batchid:payload.result[0].batchid,
    status: payload.result[0].status,
    success:payload.success 
 }  when ((payload.result != null) and (sizeOf payload.result  > 0)) 
 otherwise
 {
    batchid: 0,
    status:"Not queued",
    success:false
 }

我期待结果对象只有一条记录，我检查数组是否为null或其大小是否> 0。执行转换代码时出现以下错误。不知道这里有什么问题。

我期待转换的以下输出，但我在执行转换代码时收到错误

{
    "batchexecution": {
        "batchId": 1028,
        "status": "Queued",
        "success": true
    }
}

但是我收到以下错误，因为您无法比较type :: array的值。

Message               : Exception while executing: 
{"requestId":"64b3#1638e55058c","result":[{"batchId":1037,"importId":"1037","status":"Queued"}],"success":true}
                                         ^
You cannot compare a value of type ::array.
Payload               : {"requestId":"64b3#1638e55058c","result":[{"batchId":1037,"importId":"1037","status":"Queued"}],"success":true}
Payload Type          : java.lang.String
Element               : /marketing-dbmkt-etl-marketoFlow/processors/8 @ marketing-dbmkt-etl-marketo:marketing-dbmkt-etl-marketo.xml:69 (Transform Message)
Element XML           : <dw:transform-message doc:name="Transform Message" metadata:id="90448cfd-5884-441a-a989-e32e4877ac24">
                        <dw:input-payload mimeType="application/json" doc:sample="sample_data\batchreturnObject.dwl"></dw:input-payload>
                        <dw:set-payload>%dw 1.0%output application/json---batchexecution:{batchid:payload.result[0].batchid,status: payload.result[0].status,success:payload.success}  when ((payload.result != null) and (sizeOf payload.result  > 0))otherwise{batchid: 0,status:"Not queued",success:false}</dw:set-payload>
                        </dw:transform-message>
--------------------------------------------------------------------------------
Root Exception stack trace:
com.mulesoft.weave.mule.exception.WeaveExecutionException: Exception while executing: 
{"requestId":"64b3#1638e55058c","result":[{"batchId":1037,"importId":"1037","status":"Queued"}],"success":true}
                                         ^
You cannot compare a value of type ::array.
    at com.mulesoft.weave.mule.exception.WeaveExecutionException$.apply(WeaveExecutionException.scala:10)
    at com.mulesoft.weave.mule.WeaveMessageProcessor.execute(WeaveMessageProcessor.scala:121)
    at com.mulesoft.weave.mule.WeaveMessageProcessor.process(WeaveMessageProcessor.scala:67)
    at org.mule.execution.ExceptionToMessagingExceptionExecutionInterceptor.execute(ExceptionToMessagingExceptionExecutionInterceptor.java:27)
    at org.mule.execution.MessageProcessorNotificationExecutionInterceptor.execute(MessageProcessorNotificationExecutionInterceptor.java:108)
    at org.mule.execution.MessageProcessorExecutionTemplate.execute(MessageProcessorExecutionTemplate.java:44)
    at org.mule.processor.BlockingProcessorExecutor.executeNext(BlockingProcessorExecutor.java:88)
    at org.mule.processor.BlockingProcessorExecutor.execute(BlockingProcessorExecutor.java:59)
    at org.mule.execution.ExceptionToMessagingExceptionExecutionInterceptor.execute(ExceptionToMessagingExceptionExecutionInterceptor.java:27)
    at org.mule.execution.MessageProcessorExecutionTemplate.execute(MessageProcessorExecutionTemplate.java:44)
    at org.mule.processor.BlockingProcessorExecutor.executeNext(BlockingProcessorExecutor.java:98)
    at org.mule.processor.BlockingProcessorExecutor.execute(BlockingProcessorExecutor.java:59)
    at org.mule.interceptor.AbstractEnvelopeInterceptor.processBlocking(AbstractEnvelopeInterceptor.java:58)
    at org.mule.processor.AbstractRequestResponseMessageProcessor.process(AbstractRequestResponseMessageProcessor.java:47)
    at org.mule.processor.AsyncInterceptingMessageProcessor.processNextTimed(AsyncInterceptingMessageProcessor.java:129)
    at org.mule.processor.AsyncInterceptingMessageProcessor$AsyncMessageProcessorWorker$1.process(AsyncInterceptingMessageProcessor.java:213)
    at org.mule.processor.AsyncInterceptingMessageProcessor$AsyncMessageProcessorWorker$1.process(AsyncInterceptingMessageProcessor.java:206)
    at org.mule.execution.ExecuteCallbackInterceptor.execute(ExecuteCallbackInterceptor.java:16)
    at org.mule.execution.CommitTransactionInterceptor.execute(CommitTransactionInterceptor.java:35)
    at org.mule.execution.CommitTransactionInterceptor.execute(CommitTransactionInterceptor.java:22)
    at org.mule.execution.HandleExceptionInterceptor.execute(HandleExceptionInterceptor.java:30)
    at org.mule.execution.HandleExceptionInterceptor.execute(HandleExceptionInterceptor.java:14)
    at org.mule.execution.BeginAndResolveTransactionInterceptor.execute(BeginAndResolveTransactionInterceptor.java:67)
    at org.mule.execution.ResolvePreviousTransactionInterceptor.execute(ResolvePreviousTransactionInterceptor.java:44)
    at org.mule.execution.SuspendXaTransactionInterceptor.execute(SuspendXaTransactionInterceptor.java:50)
    at org.mule.execution.ValidateTransactionalStateInterceptor.execute(ValidateTransactionalStateInterceptor.java:40)
    at org.mule.execution.IsolateCurrentTransactionInterceptor.execute(IsolateCurrentTransactionInterceptor.java:41)
    at org.mule.execution.ExternalTransactionInterceptor.execute(ExternalTransactionInterceptor.java:48)
    at org.mule.execution.RethrowExceptionInterceptor.execute(RethrowExceptionInterceptor.java:28)
    at org.mule.execution.RethrowExceptionInterceptor.execute(RethrowExceptionInterceptor.java:13)
    at org.mule.execution.TransactionalErrorHandlingExecutionTemplate.execute(TransactionalErrorHandlingExecutionTemplate.java:110)
    at org.mule.execution.TransactionalErrorHandlingExecutionTemplate.execute(TransactionalErrorHandlingExecutionTemplate.java:30)
    at org.mule.processor.AsyncInterceptingMessageProcessor$AsyncMessageProcessorWorker.doRun(AsyncInterceptingMessageProcessor.java:205)
    at org.mule.work.AbstractMuleEventWork.run(AbstractMuleEventWork.java:53)
    at org.mule.work.WorkerContext.run(WorkerContext.java:301)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:748)

********************************************************************************
json mule mule-component dataweave mule-esb
2个回答
1
投票

这里的问题并不明显，但我之前遇到过同样的问题 - 它与sizeOf函数有关，而且Mule应用优先于某些运算符的方式很差。当你说(sizeOf payload.result > 0)它首先尝试解决payload.result > 0表达式 - 因此你看到的错误（它试图将数组比较为0）。

请改用((sizeOf payload.result) > 0)（由于这个原因，我总是在括号中包含sizeOf）。

作为旁注，你有batchid:payload.result[0].batchid - 它应该是batchId:payload.result[0].batchId（在batchId的资本化）

0
投票

每当你在dataweave中使用像sizeOf这样的函数时，尝试用圆括号封装它以避免这些错误。

在你的情况下@ghoshyTech

   when ((payload.result != null) and ((sizeOf payload.result)  > 0))
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