Fix incorrect (de-) serialization of tools

[mr-zepol]

Fixes #562 and #492

[codacy-production]

Coverage summary from Codacy

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Coverage variation	Diff coverage
✅ +0.08%	✅ 91.30%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (2e3b7af)	6358	4745	74.63%
Head commit (f4cc7f4)	6369 (+11)	4758 (+13)	74.71% (+0.08%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#568)	23	21	91.30%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[VinodAnandan]

@mr-zepol Thank you very much for the fix PR! @andrew-m-leonard @jgraglia @sschuberth
Could you please help with this PR validation if you’re available? Thank you in advance!

[jgraglia]

Hi, I can confirm that this PR fix my pb with tools duplication. My tests are now ok with this PR.
Thank you !

[andrew-m-leonard]

Is there a "build" of this PR please? as we use the pre-built jars from Maven