Error sending HTTP request. Message payload is of type: LinkedHashMap [MULE ESB]

Question

I'm new in MULE ESB, I have this code and i'm trying sending a http request using http:request with the following format:

"http: //www.host.com/api/commentThreads?key=val&part=val2&..."

    <file:inbound-endpoint  connector-ref="fileConnector" path="C:/tmp/input" 
                            doc:name="Reader File Configuration" responseTimeout="10000" 
                            encoding="UTF-8" mimeType="text/plain"
                            pollingFrequency="20000">
        <file:filename-wildcard-filter pattern="*.json"/>
    </file:inbound-endpoint>

    <json:json-to-object-transformer returnClass="java.util.Map" doc:name="JSON to Object"/>

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

    <http:request config-ref="HTTP_Request_Configuration" path="/commentThreads" method="GET" port="443" doc:name="HTTP Request">
        <http:request-builder>
            <http:query-param paramName="key" value="#[message.payload.key]"/>
            <http:query-param paramName="allThreadsRelatedToChannelId" value="#[message.payload.allThreadsRelatedToChannelId]"/>
            <http:query-param paramName="part" value="#[message.payload.part]"/>
        </http:request-builder>
    </http:request>

But I'm having this error:

Message : Error sendinbut g HTTP request. Message payload is of type: LinkedHashMap

Code : MULE_ERROR--2

Exception stack is:

null (java.util.concurrent.TimeoutException) org.glassfish.grizzly.impl.SafeFutureImpl$Sync:357 (null)

Error sending HTTP request. Message payload is of type: LinkedHashMap (org.mule.api.MessagingException)
org.mule.module.http.internal.request.DefaultHttpRequester:190 (http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/MessagingException.html)

The question is how can I do to make a http request with that format using the map?

According to documents

https://www.mulesoft.org/documentation/display/current/HTTP+Request+Connector#HTTPRequestConnector-HTTPRequestBody

The Mule Message payload is converted into a byte array and sent as the HTTP Request's body. This behavior is carried out always, except in the following scenarios:

The Mule Message's Payload is a Map of keys and values

Generate the Request Body with Content-Type:application/x-form-urlencoded

Whenever the message payload is a Map, the connector automatically generates an HTTP request with the header Content-Type:application/x-www-form-urlencoded. The keys and values of the map in the payload are converted into form parameter keys and values in the body of the HTTP request.

I suppose the map is converter automatically for the request. Correct me if I'm wrong

Carlos Laspina Carlos Laspina · Accepted Answer · 2015-05-15T18:52:37

It was necessary to make a transformation before the

<json: json-to-object-transformer returnClass = "java.util.Map" doc: name = "JSON to Object" />

It is corrected by putting

<byte-array-to-string-transformer doc: name = "Byte Array to String" />

Error sending HTTP request. Message payload is of type: LinkedHashMap [MULE ESB]

2 Answers