[Bug 1766998] Update Released

[Brian Murray]

The verification of the Stable Release Update for ceph has completed
successfully and the package has now been released to -updates.
Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1766998

Title:
  [SRU] ceph: replace -source/-target 1.8 with --release 7

Status in ceph package in Ubuntu:
  Fix Released
Status in ceph source package in Bionic:
  Fix Released

Bug description:
  [Impact]
  The fix for bug #1756854 updated the -source and -target from 1.5 to 1.8 to allow the build to succeed with openjdk-9 as well as to keep compatibility with openjdk-11.

  That change missed the fact that the right way to set the target jdk
  level in openjdk-9 is to actually use the --release flag, introduced
  by JEP-247 [1]. By using the --release flag the right bootclasspath is
  also set, which prevents API compatibility problems when running the
  compiled jar/classes with older jdks (including the targeted one)
  [2,3].

  Also, while JEP-182 [4] indicated that OpenJDK-11 would only allow a
  minimum source/target of 1.8, that later changed due to introduction
  of a 6-month release cycle, which moved the minimum source/target to
  1.6 for openjdk-10 [5] and to 1.7 for openjdk-11 [6].

  Thus the proposal is to move from "-source 1.8 -target 1.8" to "--
  release 7" in order to accommodate both changes.

  Currently ceph does not seem to make use any of the known APIs that
  can cause such failure when run with openjdk-8, but there is a risk of
  openjdk-11 introducing additional changes that could change that.

  [Test Case]
   * There is no known use case for it yet: of the known API incompatibilities none seems to be used by cephs-java, but that only goes as far as openjdk-9 and openjdk-10.

  In order to check the binary compatibility of the generated jar and
  jni:

  $ apt-get install libcephfs-java ceph-test \
      openjdk-11-jre-headless # or openjdk-8-jre-headless

  # replace with java-8-openjdk-amd64 for openjdk-8
  $ /usr/lib/jvm/java-11-openjdk-amd64/bin/java \
      -DCEPH_CONF_FILE=/etc/ceph/ceph.conf \
      -Djava.library.path=/usr/lib/jni/ \
      -cp /usr/share/java/junit4.jar:/usr/share/java/libcephfs.jar:/usr/share/java/libcephfs-test.jar \
      org.junit.runner.JUnitCore \
      com.ceph.fs.CephAllTests

  It should report back:
  FAILURES!!!
  Tests run: 27,  Failures: 4

  The 4 failures are:

  1) test_double_mount(com.ceph.fs.CephDoubleMountTest)
  java.lang.Exception: Unexpected exception, expected<com.ceph.fs.CephAlreadyMountedException> but was<java.io.FileNotFoundException>
  2) test_CephMountCreate(com.ceph.fs.CephMountCreateTest)
  java.io.FileNotFoundException:
  3) com.ceph.fs.CephMountTest
  java.io.FileNotFoundException:
  4) com.ceph.fs.CephMountTest
  java.lang.NullPointerException: @path is null

  which is caused by the fact that ceph itself is not running nor
  mounted.

  The test case results should be the exact same with and without the
  patch applied, for both openjdk-8 and openjdk-11. This should indicate
  that the running tests are not being affected by the flag change.

  [Regression Potential]
   * There is no known regression; these changes should actually improve ceph compatibility with openjdk-8 code by using --release to set the right bootclasspath.

  [Other Info]
   * openjdk-8 is being kept in the universe pocket for bionic and will be supported until xenial EOL (as it is in xenial's release pocket), thus it is important to guarantee that our packages can also be run and build with openjdk-8.

  [References]
  [1] http://openjdk.java.net/jeps/247
  [2] https://github.com/plasma-umass/doppio/issues/497#issuecomment-353394008
  [3] https://bugs.debian.org/895616
  [4] http://openjdk.java.net/jeps/182
  [5] https://bugs.openjdk.java.net/browse/JDK-8028563
  [6] https://bugs.openjdk.java.net/browse/JDK-8173605

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