Fix: Stabilize JsonUtilsTest.consistentTest to prevent Non-Dex nondeterminism

[Anshul-creator]

What is the purpose of the change?

This PR stabilizes JsonUtilsTest.consistentTest, which previously exhibited nondeterministic failures under random execution orders

Root Cause

The issue stemmed from comparing raw JSON strings produced by different JSON frameworks (fastjson2, fastjson, gson, jackson). These frameworks may serialize map fields in different key orders, leading to order-dependent failures.

Changes Made

• Updated assertions to compare JSON structures instead of raw strings using:

  new ObjectMapper().readTree(json)

  This ensures comparisons are semantically equivalent and order-insensitive.

• Added throws Exception to the test method to handle Jackson’s checked exceptions.

Verification

You can try running the following snippet of code from the dubbo repo root, on both pre-fix and post-fix code

./mvnw -pl dubbo-common edu.illinois:nondex-maven-plugin:2.2.1:nondex \
  -DnondexRuns=10 \
  -Dtest=org.apache.dubbo.common.utils.JsonUtilsTest#consistentTest

The test should fail intermittently on the pre-fix version, but pass consistently across all seeds on the post-fix version.
NonDex run logs will be available under the dubbo-common/.nondex directory.

Checklist

• Make sure there is a GitHub_issue field for the change.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit-test to verify your logic correction. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Make sure gitHub actions can pass. Why the workflow is failing and how to fix it?

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.74%. Comparing base (aed93d5) to head (f55224c).

Additional details and impacted files

@@             Coverage Diff              @@
##                3.3   #15746      +/-   ##
============================================
- Coverage     60.77%   60.74%   -0.03%     
- Complexity       15    11724   +11709     
============================================
  Files          1938     1938              
  Lines         88627    88627              
  Branches      13381    13380       -1     
============================================
- Hits          53863    53840      -23     
- Misses        29238    29253      +15     
- Partials       5526     5534       +8     

Flag	Coverage Δ
integration-tests-java21	32.31% <ø> (-0.06%)	⬇️
integration-tests-java8	32.53% <ø> (-0.01%)	⬇️
samples-tests-java21	32.11% <ø> (+<0.01%)	⬆️
samples-tests-java8	29.82% <ø> (-0.03%)	⬇️
unit-tests-java11	59.02% <ø> (-0.04%)	⬇️
unit-tests-java17	58.50% <ø> (-0.05%)	⬇️
unit-tests-java21	58.50% <ø> (-0.05%)	⬇️
unit-tests-java8	59.01% <ø> (+<0.01%)	⬆️

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