带有过滤的JSONPath在WSO2 ESB 5中无法正常工作

Question

I have a below mentioned like JSONPayload and I want to select the JSON object having hotelcode "ALE1_LON" from the "content" array.

For this I have used "$.content[?(@.hotelcode='ALE1_LON')]" JSONPath expression as mentioned below in the property mediator.

    <property expression="json-eval($.content[?(@.hotelcode='ALE1_LON')])" name="hotelContet" scope="default" type="STRING"/>
    <payloadFactory media-type="json">
        <format>$1</format>
        <args>
            <arg evaluator="xml" expression="get-property('hotelContet')"/>
        </args>
    </payloadFactory>
    <respond/>

Problem is, this returns an empty array.

But when I try same payload and same JSONPath with an online JSONPath Tester it says my JSONPath is correct (sending below like JSON Object).

[  
   {  
      "hotelcode":"ALE1_LON",
      "hotelname":"Alexandra"
   }
]

• Why this is not working in WSO2 ESB Propery Mediator?
• Is this because of the JSONPath version?
• WSO2 is not supported this way?
• Do I need to iterate each element and filter?

JSON Payload :

{
    "_id":"INV27_1112",
    "_rev":"5-876038bf65752ce4505e50baea6d5581",
    "content":[
        {
            "hotelcode":"AMB3_LON",
            "hotelname":"Ambassadors Bloomsbury"
        },
        {
            "hotelcode":"ALE1_LON",
            "hotelname":"Alexandra"
        },
        {
            "hotelcode":"ALO_LON",
            "hotelname":"Aloft London Excel"
        }
    ]
}

• WSO2 ESB version : 5.0.0

Note : "json-eval($.content[0])" like exprssions return results correctly

References :

• WSO2 ESB refferred JSONPath article
• WSO2 ESB Doc on JSON Support

Answer 1

Error is with the json-eval expression. == must be used for equality not =. eg : json-eval($.content[?(@.hotelcode=='ALE1_LON')]) works fine. Thank you for the support. Reference : https://odieweblog.wordpress.com/2015/09/20/new-json-path-expression-predicates/ , http://madhukaudantha.blogspot.com/2017/02/wso2-esb-with-javascript-object-notation.html