Fixed flaky test

[wang3820]

Issue

The root issue is that JSONObject.toJSONString() use HashMap to convert json data into strings. In this case, toJSONString() was called on jvalue and then the output string is compared to a fixed string. Because HashMap does not guarantee the order of elements returned, the two strings could have the same content but in different order, thus the flakiness.

Fix

This flaky test has been fixed through leveraging the Jackson library, which incorporates the JsonNode and ObjectMapper classes. These components are employed for parsing two JSON strings into tree models, which are subsequently compared node by node when assertion is called.

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