[ISSUE #10927] Upgrade fastjson2 to 2.0.64 for JDK 8 compatibility

[RongtongJin]

Which Issue(s) This PR Fixes

• Fixes [Bug] fastjson2 2.0.63 fails on JDK 8 cold start with LambdaConversionException #10927

Brief Description

RocketMQ upgraded the Maven fastjson2 dependency to 2.0.63 in #10715. That version contains a JDK 8 cold-start regression which may throw:

LambdaConversionException: Invalid caller

The regression is fixed upstream in fastjson2 2.0.64:

• [BUG] Jdk1.8 JSON.toJSONString(obj) 抛出异常 LambdaConversionException: Invalid caller alibaba/fastjson2#7691
• fix: initialize MethodHandles.Lookup before reading IMPL_LOOKUP (#7691) alibaba/fastjson2#7718
• https://github.com/alibaba/fastjson2/releases/tag/2.0.64

This change:

• upgrades the Maven fastjson2 version from 2.0.63 to 2.0.64;
• aligns the Bazel fastjson2 pin from 2.0.59 to 2.0.64;
• does not add a RocketMQ-specific initialization-order workaround.

How Did You Test This Change?

Using Amazon Corretto 1.8.0_502-b07 in a fresh JVM, I ran:

mvn -B -ntp -nsu -pl remoting -am \
  -Djacoco.skip=true \
  -Dtest=RemotingSerializableCompatTest \
  -Dsurefire.failIfNoSpecifiedTests=false \
  clean test

Results under the same environment and test command:

fastjson2	Result
2.0.63	FAILED — 2 tests, 1 error, LambdaConversionException
2.0.64	PASSED — 2 tests, 0 failures/errors

Additional verification:

• mvn -pl remoting -am -DskipTests package: passed;
• Maven dependency tree for common and remoting: resolves fastjson2 2.0.64 only;
• Maven and Bazel dependency pins are aligned at 2.0.64;
• git diff --check: passed.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.32%. Comparing base (7eee0fc) to head (051381a).

Additional details and impacted files

@@              Coverage Diff              @@
##             develop   #10928      +/-   ##
=============================================
- Coverage      48.45%   48.32%   -0.14%     
+ Complexity     13588    13546      -42     
=============================================
  Files           1380     1380              
  Lines         101196   101196              
  Branches       13130    13130              
=============================================
- Hits           49038    48902     -136     
- Misses         46190    46297     +107     
- Partials        5968     5997      +29     

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[RockteMQ-AI]

Summary

Upgrades fastjson2 from 2.0.63 → 2.0.64 (Maven) and aligns the Bazel pin from 2.0.59 → 2.0.64. This fixes a known JDK 8 cold-start regression (LambdaConversionException: Invalid caller) documented in fastjson2#7691.

Changes reviewed:

• pom.xml: fastjson2.version 2.0.63 → 2.0.64 ✓
• WORKSPACE: Bazel fastjson2 pin 2.0.59 → 2.0.64 ✓

Assessment:

• Both build systems (Maven + Bazel) are now aligned at 2.0.64
• All 10 CI checks pass (CodeQL, Bazel compile, Maven compile on JDK-8 × 3 platforms, coverage, license, misspell)
• PR description includes reproduction evidence and upstream fix references
• No API changes, no behavioral changes beyond the bugfix

LGTM — clean, minimal dependency upgrade with clear justification.

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Automated review by RockteMQ-AI

[fuyou001]

LGTM