## What is the purpose of the change

Fix invalid java example (which uses a non-existing API) in doc

## Brief change log

  - Fix the invalid java example to use correct SQL API
  - Add a runnable Flink SQL example for Java. The example's logic is the same 
as the corresponding example in scala

## Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

The example can be run manually to verify it.

## Does this pull request potentially affect one of the following parts:

none

## Documentation

  - Does this pull request introduce a new feature? (no)



[ Full content available at: https://github.com/apache/flink/pull/6790 ]
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