[Java] fix jackson-databind-nullable version variable due to Gradle Incompatibility (Template Update)#4148

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wing328 merged 4 commits intoOpenAPITools:masterfrom

jburgess:issue3592template

Oct 14, 2019

Commits on Oct 9, 2019

Replaced dashes with underscores in build.gradle files.

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Commits on Oct 10, 2019

Merge remote-tracking branch 'upstream/master' into issue3592

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Commits on Oct 14, 2019

Merge remote-tracking branch 'upstream/master' into issue3592template
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Updated mustache template files

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