[metrics-bugs] #31233 [Metrics]: Investigate UnsupportedClassVersionError issue when running `ant coverage`

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#31233: Investigate UnsupportedClassVersionError issue when running `ant coverage`
-------------------------+--------------------------
     Reporter:  karsten  |      Owner:  metrics-team
         Type:  defect   |     Status:  new
     Priority:  Medium   |  Milestone:
    Component:  Metrics  |    Version:
     Severity:  Normal   |   Keywords:
Actual Points:           |  Parent ID:
       Points:           |   Reviewer:
      Sponsor:           |
-------------------------+--------------------------
 We started discussing an issue with Cobertura on #31194 which wasn't
 really related to that ticket. Moving that issue here:

 irl wrote:

 > You're right, it is `/usr/share/java/cobertura-2.1.1.jar` but for some
 reason I didn't have that file in my system. An apt remove and apt install
 later and it was back, and now `ant coverage` does something that looks
 more like expected.

 {{{
 [cobertura-report] Cobertura 2.1.1 - GNU GPL License (NO WARRANTY) - See
 COPYRIGHT file
 [cobertura-report] Exception in thread "main"
 java.lang.UnsupportedClassVersionError:
 org/apache/oro/text/regex/MalformedPatternException has been compiled by a
 more recent version of the Java Runtime (class file version 54.0), this
 version of the Java Runtime only recognizes class file versions up to 52.0
 [cobertura-report]      at java.lang.ClassLoader.defineClass1(Native
 Method)
 [cobertura-report]      at
 java.lang.ClassLoader.defineClass(ClassLoader.java:763)
 [cobertura-report]      at
 java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
 [cobertura-report]      at
 java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
 [cobertura-report]      at
 java.net.URLClassLoader.access$100(URLClassLoader.java:74)
 [cobertura-report]      at
 java.net.URLClassLoader$1.run(URLClassLoader.java:369)
 [cobertura-report]      at
 java.net.URLClassLoader$1.run(URLClassLoader.java:363)
 [cobertura-report]      at
 java.security.AccessController.doPrivileged(Native Method)
 [cobertura-report]      at
 java.net.URLClassLoader.findClass(URLClassLoader.java:362)
 [cobertura-report]      at
 java.lang.ClassLoader.loadClass(ClassLoader.java:424)
 [cobertura-report]      at
 sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
 [cobertura-report]      at
 java.lang.ClassLoader.loadClass(ClassLoader.java:357)
 [cobertura-report]      at
 net.sourceforge.cobertura.dsl.Cobertura.<init>(Cobertura.java:61)
 [cobertura-report]      at
 net.sourceforge.cobertura.reporting.ReportMain.parseArgumentsAndReport(ReportMain.java:91)
 [cobertura-report]      at
 net.sourceforge.cobertura.reporting.ReportMain.generateReport(ReportMain.java:141)
 [cobertura-report]      at
 net.sourceforge.cobertura.reporting.ReportMain.main(ReportMain.java:151)
 }}}

 > ...but it fails

 karsten wrote:

 > Hmm, random thought: can you try installing a newer Java version (as in:
 JRE, `java` command, not necessarily JDK/`javac`)? In theory, it shouldn't
 hurt to use a newer Java version, because we're still building for 1.8
 compatibility in `src/build/java/base.xml`. Maybe you could do the upgrade
 in a way that allows a downgrade again, just in case this wasn't it.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31233>
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