Pr4645 alternative

[beiwei30]

What is the purpose of the change

protostuff : heartbeat data is null causes connect close

alternative solution for pull request #4645

Brief changelog

XXXXX

Verifying this change

XXXXX

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[codecov-io]

Codecov Report

Merging #4673 into master will decrease coverage by <.01%.
The diff coverage is 80%.

@@             Coverage Diff              @@
##             master    #4673      +/-   ##
============================================
- Coverage     63.98%   63.98%   -0.01%     
+ Complexity      453      451       -2     
============================================
  Files           769      769              
  Lines         33143    33123      -20     
  Branches       5224     5220       -4     
============================================
- Hits          21207    21193      -14     
+ Misses         9511     9504       -7     
- Partials       2425     2426       +1

Impacted Files	Coverage Δ	Complexity Δ
...e/dubbo/remoting/exchange/codec/ExchangeCodec.java	80.39% <100%> (+3.32%)	0 <0> (ø)	⬇️
...rg/apache/dubbo/rpc/protocol/dubbo/DubboCodec.java	61.85% <50%> (+4.57%)	0 <0> (ø)	⬇️
...ache/dubbo/remoting/transport/AbstractChannel.java	75% <0%> (-12.5%)	0% <0%> (ø)
.../remoting/transport/netty4/NettyServerHandler.java	61.9% <0%> (-9.53%)	0% <0%> (ø)
...ng/transport/dispatcher/all/AllChannelHandler.java	51.42% <0%> (-5.72%)	0% <0%> (ø)
.../org/apache/dubbo/remoting/ExecutionException.java	15.78% <0%> (-5.27%)	0% <0%> (ø)
...onfig/spring/extension/SpringExtensionFactory.java	80.48% <0%> (-4.88%)	0% <0%> (ø)
...e/dubbo/remoting/transport/netty/NettyChannel.java	57.64% <0%> (-4.71%)	20% <0%> (-1%)
.../apache/dubbo/remoting/transport/AbstractPeer.java	58.69% <0%> (-4.35%)	0% <0%> (ø)
...c/main/java/org/apache/dubbo/rpc/RpcException.java	80% <0%> (-3.34%)	0% <0%> (ø)
... and 6 more

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