[CAMEL-20100] Camel-jsonpath can't fetch missing field in some cases when body is returned from a http/https call

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 4.1.0
• Fix Version/s: 4.0.3, 4.3.0
• Component/s: camel-jsonpath
• Estimated Complexity: Unknown
• Assignee: Claus Ibsen
• Reporter: Damir Palinic
• Created: 10/Nov/23 12:53
• Updated: 12/Nov/23 17:50
• Resolved: 12/Nov/23 17:50

Description

When json response is received from the external REST endpoint using camel-http component, it fails to read missing json value, although DEFAULT_PATH_LEAF_TO_NULL option is set.

This can be reproduced using mockable.io service, but we noticed this behavior when calling many other REST endpoints (from real implementations). 

How to reproduce:

1. Create mocked POST REST endpoint using mockable.io
2. For example, our looks like following:
   `POST http://demo0405481.mockable.io/camel`
   Response: {"errorcode":0,"errormessage":""}
3. Create integration where REST endpoint from step 2. is called using camel-http
4. Read missing summary field using Set Property and Jsonpath with DEFAULT_PATH_LEAF_TO_NULL enabled
5. Observe the error "Cannot read message body as supported JSON value. "

Actual result:

org.apache.camel.ExpressionEvaluationException: org.apache.camel.CamelExchangeException: Cannot read message body as supported JSON value. 

Expected result:

${exchangeProperty.summary} to be null

YAML DSL to reproduce:

- route:
    nodePrefixId: route-7e2
    id: route-dafc
    from:
      uri: scheduler
      id: from-64dc
      parameters:
        name: scheduler
        repeatCount: 2
      steps:
        - setHeader:
            name: Content-Type
            expression:
              simple:
                expression: application/json
                id: simple-dc79
            id: setHeader-2f26
        - setBody:
            expression:
              simple:
                expression: |-
                  {
                    "some": "value"
                  }
                id: simple-bfca
            id: setBody-243c
        - to:
            uri: http
            id: to-2cfa
            parameters:
              httpUri: demo0405481.mockable.io/camel
              httpMethod: POST
        - setProperty:
            name: summary
            expression:
              jsonpath:
                expression: $.summary
                option: DEFAULT_PATH_LEAF_TO_NULL
                id: jsonpath-54df
            id: setProperty-0d81
        - log:
            message: 'Value: ${exchangeProperty.summary}'
            id: log-6839
 

Additional notes:

• Please create your own mock using mockable.io and create some POST REST endpoint and return any json you want
• In case summary field exists, it reads it normally
• In case body is set using Set Body component, instead of reading it from from REST endpoint, everything works fine

 

 

 

Issue Links

• links to: GitHub Pull Request #11976