[Dubbo-6837] fix dubbo @Service annotation bug

[leayer]

fix #6837

[codecov-io]

Codecov Report

Merging #6838 into master will decrease coverage by 0.08%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##             master    #6838      +/-   ##
============================================
- Coverage     59.15%   59.06%   -0.09%     
+ Complexity      510      506       -4     
============================================
  Files          1028     1028              
  Lines         41534    41536       +2     
  Branches       6041     6042       +1     
============================================
- Hits          24570    24535      -35     
- Misses        14194    14222      +28     
- Partials       2770     2779       +9     

Impacted Files	Coverage Δ	Complexity Δ
.../factory/annotation/ServiceClassPostProcessor.java	83.55% <50.00%> (-0.45%)	0.00 <0.00> (ø)
...ng/transport/dispatcher/all/AllChannelHandler.java	62.06% <0.00%> (-13.80%)	0.00% <0.00%> (ø%)
...che/dubbo/remoting/transport/mina/MinaChannel.java	39.47% <0.00%> (-10.53%)	15.00% <0.00%> (-1.00%)
.../org/apache/dubbo/remoting/ExecutionException.java	15.78% <0.00%> (-5.27%)	0.00% <0.00%> (ø%)
...e/dubbo/remoting/transport/netty/NettyChannel.java	55.68% <0.00%> (-4.55%)	20.00% <0.00%> (-1.00%)
...pache/dubbo/remoting/transport/AbstractServer.java	53.75% <0.00%> (-3.75%)	0.00% <0.00%> (ø%)
...he/dubbo/remoting/transport/netty/NettyServer.java	70.17% <0.00%> (-3.51%)	8.00% <0.00%> (-1.00%)
...exchange/support/header/HeaderExchangeHandler.java	61.06% <0.00%> (-2.66%)	0.00% <0.00%> (ø%)
...pache/dubbo/registry/support/AbstractRegistry.java	79.25% <0.00%> (-1.86%)	0.00% <0.00%> (ø%)
...a/org/apache/dubbo/monitor/dubbo/DubboMonitor.java	88.57% <0.00%> (-0.96%)	16.00% <0.00%> (-1.00%)
... and 5 more

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