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Tuesday, August 5, 2008

Installing IBM JDK 6.0 on Ubuntu

The IBM JDK offers performance benefits over Sun's JDK, which is especially useful when playing around with, say, the Scala interpreter. Installing it on Ubuntu can be a little tricky, but here's how you do it:

  1. Download the IBM JDK version 6 here.
  2. Install fakeroot and java-package with sudo apt-get install fakeroot java-package.
  3. Edit /usr/share/java-package/ibm-j2sdk.sh and add this on line 28:
    "ibm-java-sdk-6.0-1.0-linux-i386.tgz" ) # SUPPORTED
        j2se_version=1.6.0${revision}
        j2se_expected_min_size=82 # 85983232 bytes
        found=true
        ;;
    
  4. Navigate to the directory where the JDK was downloaded and execute fakeroot make-jpkg ibm-java-sdk-6.0-1.0-linux-i386.tgz.
  5. Install the debian package that was created.
  6. Type sudo update-alternatives --config java to choose to use the IBM JDK.

Note: Previously, I had always installed JDKs manually, but if you want to use the JDKs that come in the repositories, make sure to pick up libreadline-java and libjline-java to make it easier to work with the scala interative shell.
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