I'm using a Mule 4 logger component in a flow to log two flow variables, var1 and var2. Both vars are strings.
<logger level="INFO" doc:name="Logger" message='#["var1 = $(vars.var1), var2 = $(vars.var2)"]'/>
At runtime, this is throwing an exception:
Message : "org.mule.weave.v2.el.exceptions.UnableToInferOutputTypeException: Unable to infer a output media type as more than one is being used: application/java,application/json please specify using: 'output <your mime-type> --- <expr>'
This is caused by the two vars having different MIME types – one is application/java and the other is application/json. The fix is to explicitly set the output type in the message:
<logger level="INFO" doc:name="Logger" message='#[output application/java --- "var1 = $(vars.var1), var2 = $(vars.var2)"]'/>
Related
I have defined a variable to keep application/json collection.
My original payload contain following json block;
"amendments": {
"amendmentId": ["8a9a84b76b5a5a59016b687bae35012e",
"8a9a84b76b5a5a59016b6888e90e0144"]
}
<set-variable value="#[payload..amendmentId[1]]" doc:name="AmendmentIds" doc:id="03b6c46a-fc7b-43d4-b23a-502146ef0b13" variableName="amendmentids"/>
<logger level="INFO" doc:name="Logger" doc:id="6a1ad892-65f9-4dd2-9891-bdf3ad64c908" message="#[vars.amendmentids]" />
It prints as;
[
"8a9a84b76b5a5a59016b687bae35012e",
"8a9a84b76b5a5a59016b6888e90e0144"
]
Then I use ForEach loop to define few process logic for each Id,
Within foreach loop how I can get, each above id?
I used,vars.amendmentids[vars.counter]], but getting following error[1]
<foreach doc:name="For Each" doc:id="7b741315-aa28-4704-82f0-629c21d93853" collection="#[vars.amendmentids]">
<logger level="INFO" doc:name="Logger" doc:id="049c3137-2f92-4077-8e3f-b26516cc5528" message="#[vars.amendmentids[vars.counter]]"/>
</foreach>
[1]
Message : "Internal execution exception while executing the script, this is most probably a bug, file an issue with the script and the input data.
Caused by:
java.lang.RuntimeException: Unable to infer a output media type as more than one is being used: application/json,application/java please specify using: output <your mime-type> --- <expr>
at org.mule.weave.v2.el.MuleDataWeaveHelper$.inferImplicitOutput(MuleDataWeaveHelper.scala:69)
.............
" evaluating expression: "vars.amendmentids[vars.counter]".
Error type : MULE:EXPRESSION
I fixed it by defining output mime type like;
<logger level="INFO" doc:name="Logger" doc:id="049c3137-2f92-4077-8e3f-b26516cc5528" message="#[output application/java --- vars.amendmentids[vars.counter - 1]]"/>
I have defined a variable to keep application/json collection.
<set-variable value="#[payload.'IntegrationEntities'.'amendmentId']" doc:name="AmendmentIds" doc:id="03b6c46a-fc7b-43d4-b23a-502146ef0b13" variableName="amendmentids"/>
<logger level="INFO" doc:name="Logger" doc:id="6a1ad892-65f9-4dd2-9891-bdf3ad64c908" message="#[vars.amendmentids]" />
It prints as;
[
"8a9a84b76b5a5a59016b687bae35012e",
"8a9a84b76b5a5a59016b6888e90e0144"
]
Then I use ForEach loop to define few process logic for each Id,
Within foreach loop how I can get, each above id?
I used,vars.amendmentids[vars.counter]], but getting following error[1]
<foreach doc:name="For Each" doc:id="7b741315-aa28-4704-82f0-629c21d93853" collection="#[vars.amendmentids]">
<logger level="INFO" doc:name="Logger" doc:id="049c3137-2f92-4077-8e3f-b26516cc5528" message="#[vars.amendmentids[vars.counter]]"/>
</foreach>
[1]
Message : "Internal execution exception while executing the script, this is most probably a bug, file an issue with the script and the input data.
Caused by:
java.lang.RuntimeException: Unable to infer a output media type as more than one is being used: application/json,application/java please specify using: output <your mime-type> --- <expr>
at org.mule.weave.v2.el.MuleDataWeaveHelper$.inferImplicitOutput(MuleDataWeaveHelper.scala:69)
.............
" evaluating expression: "vars.amendmentids[vars.counter]".
Error type : MULE:EXPRESSION
you need to access the payload only in foreach scope:
<foreach doc:name="For Each" collection="#[vars.amendmentids]">
<logger level="INFO" doc:name="Logger" message="#[payload]"/>
</foreach>
As in foreach each element of your collection will be the payload.
We want to process all of the exceptions we catch with the same process in our exception strategy. It is the one generated by apikit. We first send a lot with a custom component and then we generate json response. In the response with DataWeave we want to set the same statusCode. However, the statusCode do not seem to be a variable that is retrievable. Am I correct, or there is a good way to retrieve it?
<apikit:mapping-exception-strategy xmlns:apikit="http://www.mulesoft.org/schema/mule/apikit" name="svc0031_hotel-apiKitGlobalExceptionMapping">
<apikit:mapping statusCode="504">
<apikit:exception value="org.mule.api.transformer.TransformerMessagingException"/>
<flow-ref name="svc0031_manageErrors" doc:name="Manage Error"/>
</apikit:mapping>
<apikit:mapping statusCode="404">
<apikit:exception value="org.mule.api.transformer.TransformerMessagingException"/>
<flow-ref name="svc0031_manageErrors" doc:name="Manage Error"/>
</apikit:mapping>
</apikit:mapping-exception-strategy>
<sub-flow name="svc0031_manageErrors">
<set-payload value="#[groovy:message.exceptionPayload.rootException.message]" doc:name="Set BIP Payload"/>
<custom-transformer class="se.zystems.baseline.BaselineLogging" doc:name="Log BIP Outgoing">
<spring:property name="Level" value="ERROR"/>
<spring:property name="ObjectId" value="CatchErrors"/>
<spring:property name="TransactionStatus" value="failed"/>
</custom-transformer>
<dw:transform-message doc:name="Transform Message">
<dw:set-payload><![CDATA[%dw 1.0
%output application/json
---
{
status : 400,
message : payload,
code : 42,
more_info :"https://anypoint.mulesoft.com/apiplatform/nordic-choice-hotels"
}]]></dw:set-payload>
</dw:transform-message>
<logger level="INFO" doc:name="Logger"/>
</sub-flow>
Good,
If you create a variable with the http.status then you can use it in the mapper:
<flow name="test">
<set-variable variableName="httpStatus" value="#[message.inboundProperties['http.status']" doc:name="Variable"/>
<dw:transform-message doc:name="Transform Message">
<dw:set-payload><![CDATA[%dw 1.0
%output application/json
---
{
status : flowVars.httpStatus,
message : payload,
code : 42,
more_info :"https://anypoint.mulesoft.com/apiplatform/nordic-choice-hotels"
}]]></dw:set-payload>
</dw:transform-message>
</flow>
I found out where the statusCode value is stored thanks to the answer by Jesús Pablo Fernández
He was almost right in his answer, however, the statusCode is stored not in message.inboundProperties['http.status'], but in message.outboundProperties['http.status']. No need to even extract a variable, one can just access it in data transformer directly like this:
<dw:transform-message doc:name="Transform Message">
<dw:set-payload><![CDATA[%dw 1.0
%output application/json
---
{
status : outboundProperties['http.status'],
message : payload,
code : 42,
more_info :"https://anypoint.mulesoft.com/apiplatform/nordic-choice-hotels"
}]]></dw:set-payload>
</dw:transform-message>
Status codes defined in the APIKitExceptionStrategy will be those sent back in the response header as http.status given the corresponding exception to be raised.
For instance,
<apikit:mapping statusCode="504">
<apikit:exception value="org.mule.api.transformer.TransformerMessagingException"/>
<flow-ref name="svc0031_manageErrors" doc:name="Manage Error"/>
</apikit:mapping>
means that when a org.mule.api.transformer.TransformerMessagingException exception is thrown and caught by this exception block, then a 504 status code is sent back as a response header.
If you want to bypass the statusCode attribute in the APIKit exception block, you should have another exceptionStrategy block to catch your desired exception, and then you could set your status code like that
<set-property name="http.status" value="<the_desired_status, e.g. 401>" />
Hope it helps.
/Tony
Good Stanislav Ivanov,
I have a flow implemented with the APIKit, which is the code that I attach and whether there is property in the inboundProperties http.status, review it because if it should contain the value, if you do not have your flow may modify the value in a previous step.
I pointed him to directly access the outboundProperties in the mapper, I was not aware, thank you very much.
I am trying to generate and set a map (with 2 key value pairs) on the fly as the payload for the following HTTP call. However, the MEL expression for creating the Map is not working.
<sub-flow name="call-myservice" doc:name="call-myservice">
<set-payload value="#[username :${my.username}, password : ${my.password}]" doc:name="Set Payload"/>
<https:outbound-endpoint exchange-pattern="request-response" host="${myservice.Host}" method="POST" mimeType="application/json" doc:name="My Service call" path="mypath" port="443"/>
</sub-flow>
I followed the instructions at http://www.mulesoft.org/documentation/display/current/Mule+Expression+Language+MEL
which suggests --
MEL provides a streamlined way to access map data.
Rather than constructing a map with a new statement, and then using its put method to populate it, you can simply write the following:
[key1 : value1, key2 : value2, . . .]
However, it is giving me the following exception --
ERROR 2014-02-28 15:27:51,424 [[services-proxy].connector.http.mule.default.receiver.02] org.mule.exception.DefaultMessagingExceptionStrategy:
********************************************************************************
Message : Execution of the expression "username :abc, password : pwd" failed. (org.mule.api.expression.ExpressionRuntimeException). Message payload is of type: String
Code : MULE_ERROR--2
--------------------------------------------------------------------------------
Exception stack is:
1. [Error: unresolvable property or identifier: username]
[Near : {... username :abc, pa ....}]
^
[Line: 1, Column: 1] (org.mvel2.PropertyAccessException)
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer:687 (null)
You are missing square brackets to delimit the map (the only ones you have delimit the Mule expression). Change it to:
<set-payload value="#[['username' :${my.username}, 'password' : ${my.password}]]" doc:name="Set Payload"/>
I have a mule flow within which I am logging the entire payload in String format by following code snippet
<logger level="ERROR" message="#[payload:java.lang.String]"/>
Now if the error occurs there really is no need to print the entire payload. The payload object in the message is null and the exception payload is populated with the relevant exception in it.
If I can print just the exception payload in String format, that would suffice. Does any one know how to log the exception payload from the message ?
<logger level="ERROR" message="
#[groovy:message.getExceptionPayload().getRootException().getMessage()]" />
The above code extracts the message related to the cause of exception.
Quite simply:
<logger level="ERROR" message="#[exception]"/>
small correction in the expression use:
[groovy:message.getExceptionPayload().getRootException().getMessage()]
If you want to save error into payload you need to transform it:
%dw 2.0
output application/json
---
{
error: error.detailedDescription,
errorType: (error.errorType.namespace default '') ++ ":" ++ (error.errorType.identifier default '') ,
recoverable: false
}
So, into payload you have your error