Fix issue 2698: resolve errors in generating javadocs by mvn install #2781
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Describe what this PR does / why we need it
Fix errors that are reported when generating javadocs by mvn install in branch 2021.x.
Does this pull request fix one issue?
Fixes #2698 in branch 2021.x
Describe how you did it
Describe how to verify it
run
mvn install
,mvn javadoc:javadoc
(build faster) ormvn javadoc:javadoc-no-fork
(build faster)Special notes for reviews