fix checkstyle and pmd errors, to clean up all modules

Description

These components are already clean:
mycore-acl-editor2, mycore-classeditor, mycore-coma, mycore-iiif, mycore-impex, mycore-indexing, mycore-wcms2, mycore-webcli

Please check all other missing components.

Environment

None

Assignee

Michel Büchner

Reporter

Thomas Scheffler

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URL

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External issue ID

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Fix versions

Priority

Medium
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