fix issue: [2218] When using telnet "invoke" method, if there is a [n…

[elvis9xu163]

…ull] param, the response always be [null] #2218

What is the purpose of the change

issue fix

Brief changelog

fix issue: [2218] When using telnet "invoke" method, if there is a [null] param, the response always be [null] #2218

Verifying this change

XXXXX

Follow this checklist to help us incorporate your contribution quickly and easily:

• Make sure there is a GITHUB_issue filed for the change (usually before you start working on it). Trivial changes like typos do not require a GITHUB issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
• Format the pull request title like [Dubbo-XXX] Fix UnknownException when host config not exist #XXX. Each commit in the pull request should have a meaningful subject line and body.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add integration-test in test module.
• Run mvn clean install -DskipTests & mvn clean test-compile failsafe:integration-test to make sure unit-test and integration-test pass.
• If this contribution is large, please follow the Software Donation Guide.

[elvis9xu163]

I fix the issue based on last release version, so there are many conflicts and hard to resolve. now i fix again based on master.

[diecui1202]

@elvis9xu163 Maybe you need to consider the primary type.

[diecui1202]

#2273

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@8beeb64). Click here to learn what that means.
The diff coverage is 0%.

@@            Coverage Diff            @@
##             master    #2231   +/-   ##
=========================================
  Coverage          ?   54.83%           
  Complexity        ?     5192           
=========================================
  Files             ?      569           
  Lines             ?    25093           
  Branches          ?     4459           
=========================================
  Hits              ?    13759           
  Misses            ?     9290           
  Partials          ?     2044

Impacted Files	Coverage Δ	Complexity Δ
...rpc/protocol/dubbo/telnet/InvokeTelnetHandler.java	54.32% <0%> (ø)	13 <0> (?)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8beeb64...bb58889. Read the comment docs.

[diecui1202]

@elvis9xu163 I'll close this PR, we can take more discussion on #2273