[tor-bugs] #19620 [Metrics/Metrics website]: all metrics-web java projects should use java 8

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#19620: all metrics-web java projects should use java 8
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     Reporter:  iwakeh                   |      Owner:
         Type:  enhancement              |     Status:  new
     Priority:  Medium                   |  Milestone:
    Component:  Metrics/Metrics website  |    Version:
     Severity:  Normal                   |   Keywords:
Actual Points:                           |  Parent ID:  #19617
       Points:                           |   Reviewer:
      Sponsor:                           |
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 use java8 in all java modules.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19620>
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