title: Why does sbt report "No java installations was detected" with $JAVA_HOME set?
body: <p>I have 2 sbt-android-scala projects. The first one is a single one:</p>
  
  <pre><code>$ ls -al
  drwxr-xr-x  13 alex  staff   442 Dec 24 20:44 .
  drwxr-xr-x   4 alex  staff   136 Dec 24 21:08 ..
  drwxr-xr-x  12 alex  staff   408 Dec 24 20:38 .git
  -rw-r--r--   1 alex  staff   141 Dec 24 20:38 .gitignore
  -rw-r--r--   1 alex  staff   115 Dec 24 20:38 .travis.yml
  -rw-r--r--   1 alex  staff   664 Dec 24 20:38 CHANGES
  -rw-r--r--   1 alex  staff  1418 Dec 24 20:38 LICENSE
  -rw-r--r--   1 alex  staff  2491 Dec 24 20:38 README.md
  -rw-r--r--   1 alex  staff   874 Dec 24 20:38 build.sbt
  drwxr-xr-x  10 alex  staff   340 Dec 24 20:38 notes
  drwxr-xr-x   5 alex  staff   170 Dec 24 20:43 project
  drwxr-xr-x   3 alex  staff   102 Dec 24 20:38 src
  drwxr-xr-x   5 alex  staff   170 Dec 25 01:17 target
  </code></pre>
  
  <p>The second one has sub-projects in it:</p>
  
  <pre><code>    $ ls -al
  drwxr-xr-x  23 alex  staff    782 Dec 24 21:57 .
  drwxr-xr-x   4 alex  staff    136 Dec 24 21:08 ..
  drwxr-xr-x  13 alex  staff    442 Dec 24 21:57 .git
  -rw-r--r--   1 alex  staff     44 Dec 24 21:57 .gitignore
  -rw-r--r--   1 alex  staff    203 Dec 24 21:57 .gitmodules
  -rw-r--r--   1 alex  staff     46 Dec 24 21:57 .sbtopts
  -rw-r--r--   1 alex  staff     55 Dec 24 21:57 .sbtrc
  -rw-r--r--   1 alex  staff  35119 Dec 24 21:57 LICENSE.md
  -rw-r--r--   1 alex  staff   6964 Dec 24 21:57 README.md
  -rw-r--r--   1 alex  staff  30626 Dec 24 21:57 RELEASE-NOTES.md
  drwxr-xr-x  18 alex  staff    612 Dec 24 21:57 my_prj1
  -rw-r--r--   1 alex  staff    892 Dec 24 21:57 build.sbt
  drwxr-xr-x  11 alex  staff    374 Dec 24 21:57 common
  drwxr-xr-x  11 alex  staff    374 Dec 24 21:57 my_prj2
  drwxr-xr-x   3 alex  staff    102 Dec 24 21:57 my_prj3
  drwxr-xr-x   7 alex  staff    238 Dec 24 22:01 project
  </code></pre>
  
  <p>When I run <code>sbt</code> in the 1st project, it compiles well, unlike in the 2nd one:</p>
  
  <pre><code>$ sbt
  
  No java installations was detected.
  Please go to http://www.java.com/getjava/ and download
  </code></pre>
  
  <p>But</p>
  
  <pre><code>$ echo $JAVA_HOME
  /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
  </code></pre>