Installing WTK2.5.2 on a 64-bit machine

One of the classes I’m currently teaching involves group programming of a game for (old) mobile phones – this is based on J2ME, and the standard setup for the class uses Sun’s (now Oracle’s) wireless toolkit WTK v2.5.2. This is Java-based technology so in principle should work cross-platform. However, the WTK is only available for 32-bit builds. This means that to use this, you’ll need the 32-bit Java Development Kit (JDK) installed. Now since most modern machines are 64-bit, and since the standard lab setup is 64-bit Ubuntu, one needs to jump through a few hoops to get this to work.

I’m writing this to document the process. This is based on the work of a current BSc student who wrote a blog post about this. The only major change to his process is the installation of the 32-bit JDK rather than the JRE as a 32-bit JDK is actually needed on our current setup. So here goes:

  1. Download the Linux x86 (32-bit) JDK (get the bin, not the rpm).
  2. Install this to a local folder; I’d recommend installing as root into /opt/jdk1.6.0_31 (this is the default folder if you run this in /opt)
  3. Download the Linux WTK 2.5.2 (get the, not the windows exe).
  4. Install this to a local folder; I’d recommend installing as root into /opt/wtk. While this is installing you need to specify the location of the JDK environment; if you followed the above, this is in /opt/jdk1.6.0_31/bin. This will set the necessary javapathtowtk path for the emulator and ktoolbar shell scripts in /opt/wtk/bin; you can verify that this is so with a text editor.
  5. That’s it, you should be done with the install. To make this work under Eclipse, after installing EclipseME (from directly in Eclipse) you need to set the WTK root path to /opt/wtk.


  1. What is the point of this blog post if you are installing a 32 bit jdk? I assumed that you would do that using a 64 bit jdk.

    • One has to use a 32 bit JDK because the WTK is (or at least was, I haven’t touched this topic in many years) only available for 32 bit systems.

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