如何使用石英在骡子中每 2 分钟运行一次查询

Question

我想每 2 分钟执行一次查询，但出现以下错误。

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Exception stack is:
1. No serializer found for class org.mule.transport.NullPayload and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS) ) (org.codehaus.jackson.map.JsonMappingException)
  org.codehaus.jackson.map.ser.impl.UnknownSerializer:52 (null)
2. No serializer found for class org.mule.transport.NullPayload and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS) ) (org.codehaus.jackson.map.JsonMappingException) (org.mule.api.transformer.TransformerException)
  org.mule.module.json.transformers.ObjectToJson:107 (http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/transformer/TransformerException.html)
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Root Exception stack trace:
org.codehaus.jackson.map.JsonMappingException: No serializer found for class org.mule.transport.NullPayload and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS) )
    at org.codehaus.jackson.map.ser.impl.UnknownSerializer.failForEmpty(UnknownSerializer.java:52)
    at org.codehaus.jackson.map.ser.impl.UnknownSerializer.serialize(UnknownSerializer.java:25)
    at org.codehaus.jackson.map.ser.StdSerializerProvider._serializeValue(StdSerializerProvider.java:610)
    + 3 more (set debug level logging or '-Dmule.verbose.exceptions=true' for everything)
********************************************************************************

我的流程如下。

 <flow name="testdbFlow1" doc:name="testdbFlow1">

        <quartz:inbound-endpoint responseTimeout="10000" doc:name="Quartz" jobName="CronJobSchedule" repeatInterval="0" cronExpression="0 0/2 * ? * MON-FRI" repeatCount="1">                   
        <quartz:event-generator-job/>
        </quartz:inbound-endpoint>
        <jdbc-ee:outbound-endpoint queryKey="select_qry" queryTimeout="-1"  connector-ref="Database" doc:name="Database"/>
        <json:object-to-json-transformer doc:name="Object to JSON"/>
        <echo-component doc:name="Echo"/> 

    </flow>

Answer 1

通过添加quartz:payload 尝试以下操作：-

<flow name="testdbFlow1" doc:name="testdbFlow1">
<quartz:inbound-endpoint responseTimeout="10000" doc:name="Quartz" jobName="CronJobSchedule" repeatInterval="0" cronExpression="0 0/2 * ? * MON-FRI" repeatCount="1">                   
        <quartz:event-generator-job>
<quartz:payload>quartzSchedular started</quartz:payload>
</quartz:event-generator-job>
        </quartz:inbound-endpoint>
        <jdbc-ee:outbound-endpoint queryKey="select_qry" queryTimeout="-1"  connector-ref="Database" doc:name="Database"/>
        <json:object-to-json-transformer doc:name="Object to JSON"/>
        <echo-component doc:name="Echo"/> 

    </flow>

更新：- 在 json:object-to-json-transformer 之后使用记录器，如下所示：-

<logger message="#[message.payload]" level="INFO" doc:name="Logger"/>

并移除回显组件...

并在 JDBC 组件中制作 exchange-pattern="request-response"，如下所示：-

<jdbc-ee:outbound-endpoint queryKey="select_qry" queryTimeout="-1"  connector-ref="Database" exchange-pattern="request-response" doc:name="Database"/>