Karate Json Object - JsonPaths for nested array objects

Question

I am using the karate java-api to work with Json objects. I have the below json to be created:

{
    "a": [
        {
            "b": [
                {
                    "c": "hello"
                }
            ]
        }
    ]
}

When I try to json.set("$.a[0].b[0].c", "hello"), I get the below error :

Exception in thread "main" java.lang.ClassCastException: class java.util.LinkedHashMap cannot be cast to class java.util.List (java.util.LinkedHashMap and java.util.List are in module java.base of loader 'bootstrap')
    at com.intuit.karate.Json.createPath(Json.java:232)
    at com.intuit.karate.Json.createPath(Json.java:246)
    at com.intuit.karate.Json.setInternal(Json.java:199)
    at com.intuit.karate.Json.set(Json.java:148)

The json path syntax is correct as cross checked, any other point(s) which I might be missing?

Edit: I'm using v1.1.0 of karate-core

Peter Thomas · Accepted Answer · 2021-10-12 07:10:47Z

1

Looks like a bug in Karate where so much array nesting is not supported. To replicate:

* def foo = {}
* set foo.a[0].b[0].c = 'hello'
* print foo

Since you were keen to contribute to Karate, maybe you can fix this :) Feel free to open an issue.

Here's the workaround:

* def foo = {}
* set foo.a[0].b = [{ c: 'hello' }]
* print foo

answered Oct 12, 2021 at 7:10

Peter Thomas

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2 Comments

Peter Thomas Over a year ago

never mind I opened an issue: github.com/karatelabs/karate/issues/1799

Yash Patil Over a year ago

Thank you Peter :D The workaround which I am currently using is foo.a[0].b = []

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