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[cowwoc <1223623@xxxxxxxxxxxxxxxxxx>]

Nevermind, this is not a bug. It was caused by my misunderstanding of
how update-alternatives works. If anyone else runs into this problem,
please see http://askubuntu.com/a/344334/23678 for a solution.

(You can close this bug, sorry for the false alarm)

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https://bugs.launchpad.net/bugs/1223623

Title:
  Skip "update-alternatives" if a JDK is already installed

Status in “openjdk-6” package in Ubuntu:
  New

Bug description:
  I have a headless automated-build server. The server executes a script
  which depends on Apache Ant. The "ant" package depends on "openjdk-6
  -jre-headless" which invokes "update-alternatives" as part of the
  installation process clobbering my existing Oracle JDK installation.

  This is an automated build server. I cannot be expected to manually
  restore "update-alternatives" every time someone needs a new
  dependency. As such, I expect the build script not to clobber the
  symbolic links in the first place.

  Please avoid invoking "update-alternatives" if /usr/bin/java or
  /etc/alternatives/java are already set. When a user installs
  "openjdk-6-jre-headless" it does not necessarily mean they want it to
  replace the default JDK. It's one thing to set yourself as the default
  if no JDK exists, it's another thing to clobber existing values. If
  the user wants to change the default, they can always do so after the
  installation concludes. The contrary (restoring the default JDK) is
  not necessarily true.

  In my case, the build machine has sudo access to "apt-get" but not to
  "update-alternatives" because it is not meant to touch system
  defaults. As such, it has no way of restoring the default JDK if it
  gets clobbered.

  Alternatively, please provide a mechanism for installing "openjdk-6
  -jre-headless" without running "update-alternatives" in a way that
  will allow me to run "apt-get install ant" at a later time without it
  asking to install "openjdk-6-jre-headless" a second time.

  Final point: if you disagree, please do not close this issue
  immediately. Present your points and give me an opportunity to
  respond.

  Thank you.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: openjdk-6-jre-headless 6b27-1.12.6-1ubuntu0.12.04.2
  ProcVersionSignature: Ubuntu 3.8.0-29.42~precise1-generic 3.8.13.5
  Uname: Linux 3.8.0-29-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.4
  Architecture: amd64
  Date: Tue Sep 10 18:08:48 2013
  InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.1)
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: openjdk-6
  UpgradeStatus: No upgrade log present (probably fresh install)

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