Colin P. Fahey

CORE DEVELOPMENT TOOLS

This section describes how to download development tools that can be used
to compile J2ME source code in to class files suitable for mobile devices.
Note that Sun's "J2ME Wireless Toolkit", discussed in a later section of this
article, requires downloading the Java SDK described in this section.


JDK 1.4 (or later)

This means you need the conventional Java 2 SDK from Sun.  I downloaded and
used version 1.4 via the following link:


http://java.sun.com/j2se/1.4/download.html


Here's what the download web page looks like:




Run the installation program.  Install to the default location
(c:\j2sdk1.4.0_03) unless you are able to solve path problems that may arise.






Connected Limited Device Configuration (CLDC)
 
I won't pretend to know what this is, but I simply downloaded it from the Sun
web site.      


http://wwws.sun.com/software/communitysource/j2me/cldc/download.html


Here's what the CLDC main download web page looks like:




Only 1.0.3 was available at the time I visited.

In order to download this, I needed to register with Sun web site.  I created
the following profile:


USERNAME:        anon***anon
PASSWORD:        nospamplease
FAVORITE COLOR:  blue
FULL NAME:       Prof. Anon Nospamplease


I downloaded the following file:


j2me_cldc-1_0_3-fcs-src-b17-winunix-14_sep_2001.zip


I unzipped to the following directory:


C:\j2me


I renamed the "cldc-1_0_3-fcs" directory to simply:


cldc

(i.e., full path is c:\j2me\cldc)         






Mobile Information Device Profile (MIDP)

I won't pretend to know what this is either, but I simply downloaded it from
the Sun web site.


http://java.sun.com/products/midp/


Here's what the MIDP main download web page looks like:




I downloaded the following file:


j2me_midp-1_0_3-fcs-src-b26-win-19_sep_2001.zip


I unzipped to the following directory:


C:\j2me


I renamed the "midp-1_0_3-fcs" directory to simply:


midp

(i.e., full path is c:\j2me\midp)

CONFIGURING TOOLS

ESTABLISH PATHS

Add the following lines to you AUTOEXEC.BAT file:


REM ---- Java Support ----
SET MIDP_HOME=C:\j2me\midp
SET PATH=%PATH%;c:\j2sdk1.4.0_03\BIN;
PATH=C:\WINDOWS;C:\WINDOWS\COMMAND;C:\j2sdk1.4.0_03\BIN;C:\j2me\midp\bin;%PATH%


Then force these variables to be reloaded by running the batch file:




[CURRENT DIRECTORY: "C:\"]

autoexec.bat


You can also set up these same variables using the Windows environment variable
control panel.

Notice that I just hard-coded the path to my Java 2 SDK version.  If I upgrade,
I have to modify the AUTOEXEC.BAT file.




CHECK THE JAVA 2 SDK BINARIES

Once the settings above take effect, you should be able to run the Java
utilities from the command line without specifying the complete path to the
executables.

Try running the phone emulator:




[CURRENT DIRECTORY: "C:\"]

midp


Here is what I saw:

CONTACT INFORMATION
Colin P. Fahey
cpfahey@earthlink.net
http://www.colinfahey.com