[ISSUE #3269]Fix load plugin failure

[mxsm]

Fixes #3269

Motivation

Explain the content here.
Explain why you want to make the changes and what problem you're trying to solve.

Modifications

Fix load plugin failure

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)
• If a feature is not applicable for documentation, explain why?
• If a feature is not documented yet in this PR, please create a followup issue for adding the documentation

[codecov]

Codecov Report

Merging #3270 (931d631) into master (987378d) will not change coverage.
The diff coverage is 0.00%.

❗ Current head 931d631 differs from pull request most recent head e4f66c5. Consider uploading reports for the commit e4f66c5 to get more accurate results

@@            Coverage Diff            @@
##             master    #3270   +/-   ##
=========================================
  Coverage     13.07%   13.07%           
  Complexity     1159     1159           
=========================================
  Files           550      550           
  Lines         28763    28763           
  Branches       2857     2857           
=========================================
  Hits           3761     3761           
  Misses        24677    24677           
  Partials        325      325           

Impacted Files	Coverage Δ
.../eventmesh/spi/loader/JarExtensionClassLoader.java	13.55% <0.00%> (ø)

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