当json数组的表达式失败时，Mule4包含check

Question

使用Mule 3.9到Mule 4.x迁移工作，API接收json输入有效负载，如下所示，我试图检查我是否在此数组DFU中存在payload.sec_entities字符串值。观察到在日志语句中条件检查工作正常，请参阅下面的错误日志中显示debug-8，debug-9，debug-10的日志语句。问题是它在表达时不能使用相同的语句任何人都可以建议表达时的问题是什么？

试图表达失败时：

<when expression="#[payload.sec_entities != null and payload.sec_entities contains 'DFU']">

试过这个，即使这个表达式失败了：

<when expression="#[%dw 2.0 output application/java --- payload.sec_entities != null and payload.sec_entities contains 'DFU' as String]">

输入负载：

{
  "primary_entities": [
    "DMDUNIT",
    "LOC"
  ],
  "sec_entities": [
    "DFU",
    "STOCK"
  ]
}

码：

<flow name="Orchestrator-DFU-Flow">
        <logger message="debug-8 expression check: payload.sec_entities: #[payload.sec_entities]"/>
        <logger message="debug-9 expression check: payload.sec_entities not null check: #[payload.sec_entities != null]"/>
        <logger message="debug-10 expression check: payload.sec_entities contains: #[payload.sec_entities contains 'DFU']"/>
        <choice doc:name="Choice">
            <when expression="#[%dw 2.0 output application/java --- payload.sec_entities != null and payload.sec_entities contains 'DFU' as String]">
                <set-payload value="DFU" doc:name="Set Payload" />
                <set-variable variableName="filterJson" value="#[%dw 2.0 
import java!com::jda::cd::util::StringUtil
output application/json 
--- 
StringUtil::getFilterExpression(vars.modifiedJsonInPayload, payload)]" doc:name="Set dfuFilterJson Session Variable" doc:id="8f20824e-b4eb-431c-a2e3-bdaf155f3367"/>
                <set-variable variableName="entityMapForBatch" value='#[{"sec_entities":[payload]}]' doc:name="Variable - entityMapForBatch" doc:id="928fa7d9-b620-4e9f-9a30-caea11dd5d04"/>
                <logger message="#['Posting Filter $(payload)']" level="INFO" doc:name="Log_DFU_Filter" />
                <flow-ref name="Create_Batch" doc:name="Create_Batch" />
                <flow-ref name="post_masterdata_to_messaging_system" doc:name="post_masterdata_to_messaging_system" />
            </when>
            <otherwise>
                <logger level="INFO" doc:name="Logger" message="DFU flows will not be triggered." />
            </otherwise>
        </choice>

        <error-handler ref="Global_Errorflow_Choice_Exception_Strategy" doc:name="Reference Exception Strategy" />
    </flow>

错误日志：

INFO  2019-04-03 18:47:20,113 [[MuleRuntime].cpuLight.11: [jda-demand-adapter].Orchestrator-DFU-Flow.CPU_LITE @5011b8c6] [event: 0-cd4e4691-5612-11e9-ae40-0a0027000005] org.mule.runtime.core.internal.processor.LoggerMessageProcessor: debug-8 expression check: payload.sec_entities: ["DFU","STOCK"]
INFO  2019-04-03 18:53:30,181 [[MuleRuntime].cpuLight.09: [jda-demand-adapter].Orchestrator-DFU-Flow.CPU_LITE @36218376] [event: 0-aaaca7c1-5613-11e9-ae40-0a0027000005] org.mule.runtime.core.internal.processor.LoggerMessageProcessor: debug-9 expression check: payload.sec_entities not null check: true
INFO  2019-04-03 18:53:30,183 [[MuleRuntime].cpuLight.09: [jda-demand-adapter].Orchestrator-DFU-Flow.CPU_LITE @36218376] [event: 0-aaaca7c1-5613-11e9-ae40-0a0027000005] org.mule.runtime.core.internal.processor.LoggerMessageProcessor: debug-10 expression check: payload.sec_entities contains: true
ERROR 2019-04-03 18:53:30,187 [[MuleRuntime].cpuLight.09: [jda-demand-adapter].Orchestrator-DFU-Flow.CPU_LITE @36218376] [event: 0-aaaca7c1-5613-11e9-ae40-0a0027000005] org.mule.runtime.core.internal.exception.OnErrorContinueHandler: 
********************************************************************************
Message               : "Cannot coerce Array (["DFU", "STOCK"]) to Boolean
Trace:
  at main (line: 1, column: 91)" evaluating expression: "%dw 2.0 output application/java --- payload.sec_entities != null and payload.sec_entities contains 'DFU' as String".
Error type            : MULE:EXPRESSION
Element               : Orchestrator-DFU-Flow/processors/3 @ jda-demand-adapter:orchestrator-flow.xml:125 (Choice)
Element XML           : <choice doc:name="Choice">
<when expression="#[%dw 2.0 output application/java --- payload.sec_entities != null and payload.sec_entities contains 'DFU' as String]">

Answer 1

找到上述问题的解决方案：

<when expression="#[output application/json
--- 
((payload.sec_entities != null) and (payload.sec_entities contains 'DFU'))]">