• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 1486
  • Last Modified:

MIDP preverification snag: "java/lang/NoClassDefFoundError: javax/microedition/lcdui/CommandListener"

Java MIDP applications must be preverified before they can be executed on target devices.  (See http://developers.sun.com/techtopics/mobility/midp/articles/setup/#compile.)

While attempting to preverify \\midp2.0fcs\src\example\HelloMIDlet.java (which compiles just fine), I get the following error:

"Error preverifying class HelloMIDlet
    java/lang/NoClassDefFoundError: javax/microedition/lcdui/CommandListener"

This is odd, considering javax/microedition/lcdui/ (which does indeed contain CommandListener.class) is a subfolder of my classpath.  (If it wasn't, then the HelloMIDlet.java source obviously wouldn't have compiled in the first place.)

I did a search and found that the problem dates back to the year 2000.  (Nice.)  The only solution I found -- unpacking a midp.jar file and directing the classpath to a folder with its contents -- is no good, since there is no midp.jar file.

Has anyone successfully compiled HelloMIDlet.java?  What is the solution to the java/lang/NoClassDefFoundError: javax/microedition/lcdui/CommandListener problem?
0
MiloDC
Asked:
MiloDC
  • 5
  • 3
1 Solution
 
girionisCommented:
How do you compile it? Do you specify the classpath on the command line? If yes then you will also need to specify the classpath upon verification.
0
 
MiloDCAuthor Commented:
> girionis wrote:

> How do you compile it? Do you specify the classpath on the command line? If yes then you will also need to specify the classpath upon verification.

I do indeed specify the classpath during compilation and preverification.  Specifically:

Compile:
javac -bootclasspath C:\midp2.0fcs\classes -deprecation -g -d "TmpClasses" -classpath C:\j2sdk1.4.2_05\lib\tools.jar;C:\j2sdk1.4.2_05\lib\;C:\midp2.0fcs\classes\;. HelloMIDlet.java

Preverify:
preverify -cldc -classpath C:\j2sdk1.4.2_05\lib\tools.jar;C:\j2sdk1.4.2_05\lib\;C:\midp2.0fcs\classes\;. TmpClasses -d "Classes"

Nevertheless, I get the error upon preverification.

Very odd.

0
 
girionisCommented:
> Nevertheless, I get the error upon preverification.

Hmm.. You might not be able to use the -classpath switch with preverification. Can you do a preverify -help (or preverify --help)? YOu will probably get all the available switches that you can use with preverify.
0
The new generation of project management tools

With monday.com’s project management tool, you can see what everyone on your team is working in a single glance. Its intuitive dashboards are customizable, so you can create systems that work for you.

 
MiloDCAuthor Commented:
> girionis wrote:

> You might not be able to use the -classpath switch with preverification.

-classpath is a valid option.  This is confirmed in the documentation from Sun Microsystems.
0
 
girionisCommented:
Weird, can you try that one:

preverify -cldc -classpath C:\j2sdk1.4.2_05\lib\tools.jar;C:\j2sdk1.4.2_05\lib\;C:\midp2.0fcs\classes;. TmpClasses -d "Classes"

(note that classes folder does not have a \ at the end). Not sure if this will help though.
0
 
girionisCommented:
Can you also tell me if this class:

javax/microedition/lcdui/CommandListener is in a jar file or not? What happens if you put that jar file in the classpath?
0
 
armoghanCommented:
I use IDE JBuilderX. You can also download the trial version from JBuilder Site. It has 5-6 sample projects including HelloMIDlet.java. Just run them using the IDE. I just changed the classpath a littlebit and they run fine in the emulator. .Jad files are also automatically made. I just sink them and they are running fine on my PocketPC
0
 
MiloDCAuthor Commented:
Thanks for the answer, girionis.  :)

The slash after "C:\midp2.0fcs\classes" was the culprit.  How lame.
0
 
girionisCommented:
Well, computing is a bizarre field, even a little dot counts :)

Thank you for accepting, glad I was of help :)
0

Featured Post

Upgrade your Question Security!

Your question, your audience. Choose who sees your identity—and your question—with question security.

  • 5
  • 3
Tackle projects and never again get stuck behind a technical roadblock.
Join Now