dataweave强制字符串到数组错误

Question

I am having issue in transforming message in dataweave, in mule 3.7. input XML has structure as below: input XML

dataweave code: DAtaweave code

error as below: Exception stack is: 1. Cannot coerce a :string to a :array (com.mulesoft.weave.model.values.coercion.exception.UnsupportedTypeCoercionException) com.mulesoft.weave.model.values.formatting.ArrayFormatTypeCoercionValue:31 (null) 2. Exception while executing: header_key : payload.data.header.Key, ^ Cannot coerce a :string to a :array (com.mulesoft.weave.mule.exception.WeaveExecutionException) com.mulesoft.weave.mule.WeaveMessageProcessor$WeaveOutputHandler:162 (null)

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Root Exception stack trace: com.mulesoft.weave.model.values.coercion.exception.UnsupportedTypeCoercionException: Cannot coerce a :string to a :array at com.mulesoft.weave.model.values.formatting.ArrayFormatTypeCoercionValue.evaluate(ArrayFormatTypeCoercionValue.scala:31) at com.mulesoft.weave.model.values.formatting.ArrayFormatTypeCoercionValue.evaluate(ArrayFormatTypeCoercionValue.scala:13) at com.mulesoft.weave.reader.csv.CSVWriter.writeCSV(CSVWriter.scala:70) at com.mulesoft.weave.reader.csv.CSVWriter.writeValue(CSVWriter.scala:44) at com.mulesoft.weave.model.values.Value$class.write(Value.scala:31) at com.mulesoft.weave.engine.ast.structure.ObjectNode.write(ObjectNode.scala:11) at com.mulesoft.weave.engine.Engine.internalExecute(Engine.scala:89) at com.mulesoft.weave.engine.Engine.execute(Engine.scala:54) at com.mulesoft.weave.engine.Engine.execute(Engine.scala:169) at com.mulesoft.weave.mule.WeaveMessageProcessor$WeaveOutputHandler.write(WeaveMessageProcessor.scala:159) at org.mul e.transformer.simple.ObjectToByteArray.doTransform(ObjectToByteArray.java:63) at org.mule.transformer.AbstractTransformer.transform(AbstractTransformer.java:415) at org.mule.DefaultMuleMessage.getPayload(DefaultMuleMessage.java:425) at org.mule.DefaultMuleMessage.getPayload(DefaultMuleMessage.java:373) at org.mule.DefaultMuleMessage.getPayloadAsBytes(DefaultMuleMessage.java:714) at org.mule.module.http.internal.listener.HttpResponseBuilder.build(HttpResponseBuilder.java:177) at org.mule.module.http.internal.listener.HttpMessageProcessorTemplate.sendResponseToClient(HttpMessageProcessorTemplate.java:97) at org.mule.execution.AsyncResponseFlowProcessingPhase.runPhase(AsyncResponseFlowProcessingPhase.java:83) at org.mule.execution.AsyncResponseFlowProcessingPhase.runPhase(AsyncResponseFlowProcessingPhase.java:38) at org.mule.execution.PhaseExecutionEngine$InternalPhaseExecutionEngine.phaseSuccessfully(PhaseExecutionEngine.java:65) at org.mule.execution.PhaseExecutionEngine$InternalPhaseEx ecutionEngine.phaseSuccessfully(PhaseExecutionEngine.java:69) at com.mulesoft.mule.throttling.ThrottlingPhase.runPhase(ThrottlingPhase.java:185) at com.mulesoft.mule.throttling.ThrottlingPhase.runPhase(ThrottlingPhase.java:1) at org.mule.execution.PhaseExecutionEngine$InternalPhaseExecutionEngine.process(PhaseExecutionEngine.java:114) at org.mule.execution.PhaseExecutionEngine.process(PhaseExecutionEngine.java:41) at org.mule.execution.MuleMessageProcessingManager.processMessage(MuleMessageProcessingManager.java:32) at org.mule.module.http.internal.listener.DefaultHttpListener$1.handleRequest(DefaultHttpListener.java:126) at org.mule.module.http.internal.listener.grizzly.GrizzlyRequestDispatcherFilter.handleRead(GrizzlyRequestDispatcherFilter.java:83) at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119) at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:283) at org.glassfish.grizzly.filterchain.DefaultFilt erChain.executeChainPart(DefaultFilterChain.java:200) at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:132) at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:111) at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77) at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:536) at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112) at org.mule.module.http.internal.listener.grizzly.ExecutorPerServerAddressIOStrategy.run0(ExecutorPerServerAddressIOStrategy.java:102) at org.mule.module.http.internal.listener.grizzly.ExecutorPerServerAddressIOStrategy.access$100(ExecutorPerServerAddressIOStrategy.java:30) at org.mule.module.http.internal.listener.grizzly.ExecutorPerServerAddressIOStrategy$WorkerThreadRunnable.run(ExecutorPerServerAddressIOStrategy.java:125) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPool Executor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745)

Anyone has any idea what issue with the code? thanks a lot!

Answer 1

The only thing I can see is the map operator expects an array and payload.data.PO doesn't exist. I know you are not getting a NPE, but can you check if that is your error?