refactor: support jdk8

[CennyMo]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 52.73%. Comparing base (c9fb5ae) to head (7d7ab18).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...a/io/github/protocol/pulsar/admin/jdk/Brokers.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #37   +/-   ##
=========================================
  Coverage     52.73%   52.73%           
  Complexity       94       94           
=========================================
  Files            21       21           
  Lines           603      603           
  Branches         56       56           
=========================================
  Hits            318      318           
  Misses          237      237           
  Partials         48       48           

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