Objects.isNull is only available from jdk 1.8 but apollo-client is targeted to jdk 1.7+, so we need to use a compatible one

[nobodyiam]

No description provided.

[codecov-io]

Codecov Report

Merging #2677 into master will increase coverage by 0.03%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master    #2677      +/-   ##
============================================
+ Coverage     50.18%   50.21%   +0.03%     
- Complexity     2060     2061       +1     
============================================
  Files           413      413              
  Lines         12644    12644              
  Branches       1292     1292              
============================================
+ Hits           6345     6349       +4     
+ Misses         5851     5846       -5     
- Partials        448      449       +1

Impacted Files	Coverage Δ	Complexity Δ
...work/apollo/spring/property/PlaceholderHelper.java	80% <0%> (ø)	24 <0> (ø)	⬇️
...ervice/service/ReleaseMessageServiceWithCache.java	85.88% <0%> (-1.18%)	24% <0%> (-1%)
...work/apollo/biz/message/DatabaseMessageSender.java	66.66% <0%> (+10.41%)	8% <0%> (+2%)	⬆️

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[coveralls]

Coverage increased (+0.04%) to 53.765% when pulling 9dbc39b on nobodyiam:fix-2646-jdk7 into 7072917 on ctripcorp:master.