fix telnet not work in some scene (#4007)

[fibbery]

What is the purpose of the change

fix #4007

Brief changelog

XXXXX

Verifying this change

org.apache.dubbo.common.utils.PojoUtilsTest#test_has_no_nullary_constructor_pojo()

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[ralf0131]

Hi, thanks for the pull request, could write a unit test to cover this change?

[ralf0131]

Hey, it looks like the UT is failing, could you please take a look?

[codecov-io]

Codecov Report

Merging #4026 into master will decrease coverage by 0.67%.
The diff coverage is 42.85%.

@@             Coverage Diff              @@
##             master    #4026      +/-   ##
============================================
- Coverage     63.11%   62.44%   -0.68%     
  Complexity      564      564              
============================================
  Files           753      774      +21     
  Lines         32411    34260    +1849     
  Branches       5143     5386     +243     
============================================
+ Hits          20455    21392     +937     
- Misses         9604    10404     +800     
- Partials       2352     2464     +112

Impacted Files	Coverage Δ	Complexity Δ
.../java/org/apache/dubbo/common/utils/PojoUtils.java	71.5% <42.85%> (+1.07%)	0 <0> (ø)	⬇️
...che/dubbo/remoting/transport/mina/MinaChannel.java	43.42% <0%> (-10.53%)	16% <0%> (-1%)
.../remoting/transport/netty4/NettyServerHandler.java	61.9% <0%> (-9.53%)	0% <0%> (ø)
...onfig/spring/extension/SpringExtensionFactory.java	78.04% <0%> (-7.32%)	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)
...bo/rpc/cluster/support/FailbackClusterInvoker.java	67.21% <0%> (-3.28%)	0% <0%> (ø)
...exchange/support/header/HeaderExchangeHandler.java	59.84% <0%> (-2.37%)	0% <0%> (ø)
...pache/dubbo/registry/support/AbstractRegistry.java	80.07% <0%> (-1.54%)	0% <0%> (ø)
.../exchange/support/header/HeaderExchangeServer.java	66.98% <0%> (-0.95%)	0% <0%> (ø)
... and 29 more

---

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[ralf0131]

It failed because the license check. I think it is due to that you added a new java file but no have ASF license header.

Rat check: Summary over all files. Unapproved: 1, unknown: 1, generated: 0, approved: 302 licenses.

[fibbery]

@ralf0131
can you help me?
I can't fix this build error

[fibbery]

[ERROR] Tests run: 2, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 11.672 s <<< FAILURE! - in org.apache.dubbo.metadata.store.etcd.EtcdMetadataReportTest
[ERROR] testStoreProvider  Time elapsed: 2.895 s  <<< ERROR!
java.lang.IndexOutOfBoundsException: Index 0 out of bounds for length 0
        at org.apache.dubbo.metadata.store.etcd.EtcdMetadataReportTest.testStoreProvider(EtcdMetadataReportTest.java:85)

why occur only in openjdk11 @ralf0131

[ralf0131]

LGTM, will merge if CI pass. I triggered it manually.