[MacPorts] #56000: Install Java on the buildbot workers

[MacPorts]

#56000: Install Java on the buildbot workers
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  Reporter:  ryandesign      |      Owner:  admin@…
      Type:  enhancement     |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  server/hosting  |    Version:
Resolution:                  |   Keywords:
      Port:                  |
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Comment (by mattbishop):

 Is the env var $JAVA_HOME being set? I am failing to read it in tomcat-
 native port. Here is that PR: ​https://github.com/macports/macports-
 ports/pull/3680

 It could be being set but not read correctly. Here is my portfile's code
 to read this var:

 if {[info exists env(JAVA_HOME)]} {
     configure.args-append   --with-java-home="$env(JAVA_HOME)"
 }

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Ticket URL: <https://trac.macports.org/ticket/56000#comment:5>
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