Repairing Sun’s WTK After a JDK Upgrade

I have managed to get behind on the state of the Eclipse Mobile Tools for Java code. In an effort to catch up, I downloaded the latest code to my Ubuntu box and started up a runtime workbench. At that point, I needed to import my devices into the workspace and pointed to my Sun 2.5.2 Wireless Toolkit installation. To my surprise, it failed to be recognized. Given that I had fixed a similar problem prior to the MTJ 0.9.0 release, I was surprised to see a return of the problem.
Before digging too far into the MTJ code, I decided to see that the emulator was actually working correctly. I changed into the WTK emulator directory and attempted to run the emulator directly.

setera@ubuntu-laptop:~/software/wtk252/bin$ ./emulator
./emulator: 26: /usr/lib/jvm/java-1.5.0-sun/bin/java: not found

Ah Ha! My emulator installation is broken. What’s going on?

setera@ubuntu-laptop:~/software/wtk252/bin$ java -version
java version "1.6.0_10"
Java(TM) SE Runtime Environment (build 1.6.0_10-b33)
Java HotSpot(TM) Server VM (build 11.0-b15, mixed mode)

Sure enough, I remember recently updating my Java installation on this machine and deleting the older Java 5 installation. Of course, I had forgotten that the Sun WTK writes these files during installation . Edit the emulator file with a text editor and sure enough you can see that the installation path is hardcoded within the shell script file.

#!/bin/sh
javapathtowtk=/usr/lib/jvm/java-1.5.0-sun/bin/

In fact, all of the shell scripts in the WTK bin folder have the incorrect Java installation folder.

setera@ubuntu-laptop:~/software/wtk252/bin$ grep "/usr/lib/jvm/java-1.5.0-sun/bin/" *
defaultdevice:javapathtowtk=/usr/lib/jvm/java-1.5.0-sun/bin/
emulator:javapathtowtk=/usr/lib/jvm/java-1.5.0-sun/bin/
i18ntool:javapathtowtk=/usr/lib/jvm/java-1.5.0-sun/bin/
ktoolbar:javapathtowtk=/usr/lib/jvm/java-1.5.0-sun/bin/
mekeytool:javapathtowtk=/usr/lib/jvm/java-1.5.0-sun/bin/
prefs:javapathtowtk=/usr/lib/jvm/java-1.5.0-sun/bin/
siptool:javapathtowtk=/usr/lib/jvm/java-1.5.0-sun/bin/
utils:javapathtowtk=/usr/lib/jvm/java-1.5.0-sun/bin/
wscompile:javapathtowtk=/usr/lib/jvm/java-1.5.0-sun/bin/

A bit of searching on my machine tells me that Java is linked into /usr/bin.

setera@ubuntu-laptop:~/software/wtk252/bin$ which java
/usr/bin/java

The safest configuration is to point to the actual installation folder. Following a few links yields the installation path of /usr/lib/jvm/java-6-sun/jre/bin

setera@ubuntu-laptop:~/software/wtk252/bin$ ls -l /usr/bin/java
lrwxrwxrwx 1 root root 22 2008-11-02 07:18 /usr/bin/java -> /etc/alternatives/java
setera@ubuntu-laptop:~/software/wtk252/bin$ ls -l /etc/alternatives/java
lrwxrwxrwx 1 root root 36 2008-11-02 07:18 /etc/alternatives/java -> /usr/lib/jvm/java-6-sun/jre/bin/java

Editing the shell scripts and replacing the incorrect Java installation path with the correct path corrects the WTK installation and allows it to be used within MTJ again.

setera@ubuntu-laptop:~/software/wtk252/bin$ ./emulator
Syntax:

emulator [arguments] <Application>

If you end up having trouble importing or otherwise running a Sun WTK emulator on Linux, you may want to try looking at your installation to see if you have a similar problem.