[Fix] args struct javaclassname

[cityiron]

What this PR does:

the code same as apache/dubbo-go#903

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov-io]

Codecov Report

Merging #247 (ee6b4cc) into master (07e9397) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #247      +/-   ##
==========================================
+ Coverage   66.10%   66.14%   +0.03%     
==========================================
  Files          25       25              
  Lines        2785     2788       +3     
==========================================
+ Hits         1841     1844       +3     
  Misses        716      716              
  Partials      228      228              

Impacted Files	Coverage Δ
request.go	59.40% <100.00%> (+0.61%)	⬆️

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