[API-DRAFT] [MERGE] Fix obvious bugs that don't work properly before merge

[Hisoka-X]

Purpose of this pull request

Fix obvious bugs that don't work properly before merge.
like can't run old example in release package,
can't find new api jar in release package.

Check list

• Code changed are covered with tests, or it does not need tests for reason:
• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/incubator-seatunnel/tree/dev/docs