fix for spring package

[leizhiyuan]

fix for spring package
use default file when inputstream is null

[codecov]

Codecov Report

Merging #31 into 3.x will decrease coverage by <.01%.
The diff coverage is 60%.

@@            Coverage Diff             @@
##              3.x      #31      +/-   ##
==========================================
- Coverage   25.58%   25.58%   -0.01%     
==========================================
  Files         157      157              
  Lines       11041    11042       +1     
  Branches     1959     1959              
==========================================
  Hits         2825     2825              
- Misses       7925     7926       +1     
  Partials      291      291

Impacted Files	Coverage Δ
.../hessian/internal/InternalNameBlackListFilter.java	75% <60%> (-2.42%)	⬇️

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