add class not found cache

[OrezzerO]

No description provided.

[codecov]

Codecov Report

Merging #73 (1ca0308) into 3.x (e4c4795) will increase coverage by 0.09%.
The diff coverage is 96.55%.

@@            Coverage Diff             @@
##              3.x      #73      +/-   ##
==========================================
+ Coverage   25.97%   26.07%   +0.09%     
==========================================
  Files         158      158              
  Lines       11109    11129      +20     
  Branches     1974     1980       +6     
==========================================
+ Hits         2886     2902      +16     
- Misses       7928     7930       +2     
- Partials      295      297       +2     

Impacted Files	Coverage Δ
.../java/com/caucho/hessian/io/SerializerFactory.java	83.85% <96.55%> (+0.84%)	⬆️
.../com/alipay/hessian/generic/util/GenericUtils.java	80.87% <0.00%> (-1.30%)	⬇️
...ain/java/com/caucho/hessian/io/Hessian2Output.java	46.78% <0.00%> (-0.33%)	⬇️
...main/java/com/caucho/hessian/io/Hessian2Input.java	32.49% <0.00%> (+0.12%)	⬆️
...ay/hessian/generic/io/GenericObjectSerializer.java	89.70% <0.00%> (+2.20%)	⬆️

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[JervyShi]

LGTM