fix hessian2 反序列化bug #3640

[CrazyHZM]

修复apache/dubbo#3640 问题

[codecov-io]

Codecov Report

Merging #8 into master will increase coverage by 0.21%.
The diff coverage is 88.23%.

@@             Coverage Diff              @@
##             master       #8      +/-   ##
============================================
+ Coverage     24.24%   24.46%   +0.21%     
- Complexity      455      460       +5     
============================================
  Files            89       89              
  Lines          6289     6302      +13     
  Branches       1048     1048              
============================================
+ Hits           1525     1542      +17     
+ Misses         4547     4545       -2     
+ Partials        217      215       -2

Impacted Files	Coverage Δ	Complexity Δ
.../com/caucho/hessian/io/CollectionDeserializer.java	73.07% <100%> (+5.68%)	14 <3> (+2)	⬆️
...m/alibaba/com/caucho/hessian/io/Hessian2Input.java	19.69% <71.42%> (+0.65%)	64 <8> (+2)	⬆️
.../alibaba/com/caucho/hessian/io/Hessian2Output.java	24.43% <0%> (+0.51%)	33% <0%> (+1%)	⬆️

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[lovepoem]

Please see the java7 error https://travis-ci.org/dubbo/hessian-lite/jobs/506137514

[CrazyHZM]

Please see the java7 error https://travis-ci.org/dubbo/hessian-lite/jobs/506137514

I will look later, because I don't have a java7 environment yet, would you give me some advice?

[lovepoem]

I will look later, because I don't have a java7 environment yet, would you give me some advice?

I think you can setup a java7 in your pc

Additional, please add some test case to verify your change for the issue: apache/dubbo#3640

[CrazyHZM]

I will look later, because I don't have a java7 environment yet, would you give me some advice?

I think you can setup a java7 in your pc

Additional, please add some test case to verify your change for the issue: apache/incubator-dubbo#3640

Yes,I will add test case later.

[CrazyHZM]

I will look later, because I don't have a java7 environment yet, would you give me some advice?

I think you can setup a java7 in your pc

Additional, please add some test case to verify your change for the issue: apache/incubator-dubbo#3640

I tested it in java7 in my local environment and found that it was passed. I don’t have any ideas for now. Let’s take another look.

[lovepoem]

LGTM

[zxiang179]

使用静态全局变量，在多线程场景中是否会存在线程安全问题？

[fingthinking]

这逻辑根本不对，多线程的时候，直接报错。