hi folks, I just downloaded j2me wireless toolkit 2.1 and I compiled a sample app, this is its code:

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
/**
* A simple Hello World midlet
*
* @see MIDlet
*/
public class Test extends MIDlet {
/**
* Main application screen
*/
private Form mainScreen;
private Display myDisplay;
/**
* Creates a screen for our midlet
*/
public Test() {
	myDisplay = Display.getDisplay(this);
	mainScreen = new Form("Hello World");
/*
* Create a string item
*/
	StringItem strItem = new StringItem("Hello",
	"This is a J2ME MIDlet.");
	mainScreen.append(strItem);
}
/**
* Start the MIDlet
*/
public void startApp() throws
	MIDletStateChangeException {
	myDisplay.setCurrent(mainScreen);
}
/**
* Pause the MIDlet
*/
public void pauseApp() {
}
/**
* Called by the framework before
* the application is unloaded
*/
public void destroyApp(boolean unconditional) {
}
}

I clicked on build then run, an generic emulator showed up, when I clicked on launch to run the application, the emnulator exited with the following message on the console. What is wrong? thanks!


Creating project "Test"
Place Java source files in "E:\WTK21\apps\Test\src"
Place application resource files in "E:\WTK21\apps\Test\res"
Place application library files in "E:\WTK21\apps\Test\lib"
Settings updated
Project settings saved
Project settings saved
Building "Test"
Build complete
Running with storage root DefaultColorPhone
Method............: 100d2980 'com/sun/midp/midlet/MIDletState.createMIDlet (static)'
Stack Chunk.......: d17eb0
Frame Pointer.....: d17f0c
Current IP........: 10126161 = 10126153 offset 14
Previous Frame....: d17ed0
Previous IP.......: 1011e41f (offset 22)
Frame size........: 8 (1 arguments, 7 local variables)
Argument[0].......: d19944
Local[1]..........: 0
Local[2]..........: d17ed0
Local[3]..........: d28818
Local[4]..........: d17ee4
Local[5]..........: 100dca28
Local[6]..........: d17eb0
Local[7]..........: 1015c1d8
Operand[1]........: d19944

Method............: 100cd17c 'com/sun/midp/midlet/Selector.run (virtual)'
Stack Chunk.......: d17eb0
Frame Pointer.....: d17ed0
Current IP........: 1011e41f = 1011e409 offset 22
Previous Frame....: 0
Previous IP.......: 1
Frame size........: 6 (1 arguments, 5 local variables)
Argument[0].......: d19be8
Local[1]..........: d28a28
Local[2]..........: d19944
Local[3]..........: 0
Local[4]..........: 0
Local[5]..........: 0
Operand[1]........: d28a28

VM status:
Instruction pointer.: 10126161 (offset within invoking method: 14)
Next instruction....: 0x4c
Frame pointer.......: d17f0c
Local pointer.......: d17eec
Stack size..........: 128; sp: d17f24; ranges: d17eb8-d180b8;
Contents of the current stack frame:
d17eec: d19944 (lp)
d17ef0: 0
d17ef4: d17ed0
d17ef8: d28818
d17efc: d17ee4
d17f00: 100dca28
d17f04: d17eb0
d17f08: 1015c1d8
d17f0c: d17ed0 (fp)
d17f10: 1011e41f
d17f14: d17ee8
d17f18: 100d2980
d17f1c: d17eb0
d17f20: 0 (end of frame)
d17f24: d19944 (sp)
Execution stack contains 112 items:
d19be8
d28a28
d19944
0
0
0
0
1
d17eb4
100cd17c
d17eb0
0
d28a28
d19944
0
d17ed0
d28818
d17ee4
100dca28
d17eb0
1015c1d8
d17ed0
1011e41f
d17ee8
100d2980
d17eb0
0
d19944

Execution completed.
434391 bytecodes executed
8 thread switches
486 classes in the system (including system classes)
2449 dynamic objects allocated (72616 bytes)
1 garbage collections (0 bytes collected)
ALERT: java/lang/ClassFormatError: Bad version information.
Execution completed.
434391 bytecodes executed
8 thread switches
486 classes in the system (including system classes)
2449 dynamic objects allocated (72616 bytes)
1 garbage collections (0 bytes collected)

 

 

According to the specification attributes MIDlet-Name, MIDlet-Vendor and MIDlet-Version must be the same in JAD file and manifest. I think, you wrote bad MIDlet-Version attribute.

 

 

Hi People
I too have the same problem. the first MIDlet ran sucessfully but after trying the second one with server connection.......both of them are failing in the same way.

I checked the MIDlet name, MIDlet Vendor and MIDlet Version in both JAD file and Manifest File they are same.............any idea how to go about this.........

 

 

Hi I was having the same problem in my case

jdk1.5 generates different bytecode number
try switches -target1.4 -source1.4 for javac.

Karel.

 

 

i have the same quetion

 

 

Thanks Karel.
Im using JDK1.5 and I tried a hunderd times to get it to work. Your answer -target 1.4 -source 1.4 defintely worked !
So much for the much awaited ver 1.5 ? What wrong with this ? Does the update 1.5.1 fix it ?
Thanks

 

 

Hi, sorry my stupidity, but how can I switch -target 1.4 -source 1.4. I have the same problem as you with the "java/lang/ClassFormatError: Bad version information." Thax, I'm trying hard!

 

 

set CLDCAPI=C:\WTK21\lib\cldcapi10.jar
set MIDPAPI=C:\WTK21\lib\midpapi20.jar
javac -target 1.4 -source 1.4 -bootclasspath %CLDCAPI%;%MIDPAPI% -d tmpclasses -classpath tmpclasses C:\mypath\myprj\src\Hello.java

works absolutely fine !

 

 

i have tried javac -target 1.4 source 1.4 .... yes it worked at first time, but when i run 2nd time, the midlet pop up and nothing happen.. many time i try to javac -target 1.4 and sometime it will work ok, but the second time the midlet just pop up and nothing happen..

izzit JDk1.5 doesnt support J2ME ? what so i do to overcome this problem..

thank you..

 

 

sorry, i answer my own question, actually it was because my antivirus and firewall block the emulator..after i disable my antivirus and firewall, the emulator works ok..

 

 

hey, how do i include specific library files? im making an app for a motorola phone and i have to use these special files or something for midlets.

 

 

sorry for double post, but it has to include:
import javax.microedition.lcdui.;
import javax.microedition.midlet.;

just like the first post. the problem is, i dont know how to get them included

 

 

dont worry, i figured it out

 

 

I have the same problem too.
Running with storage root DefaultColorPhone
ALERT: java/lang/ClassFormatError: Bad version information.
Method............: 1016db58 'com/sun/midp/midlet/MIDletState.createMIDlet (static)'
Stack Chunk.......: e623f0
Frame Pointer.....: e62448
Current IP........: 101f1715 = 101f1707 + offset 14
Previous Frame....: e62410
Previous IP.......: 10214d75 (offset 22)
Frame size........: 7 (1 arguments, 6 local variables)
Argument[0].......: e632ac
Local[1]..........: 0
Local[2]..........: e62410
Local[3]..........: e785e0
Local[4]..........: e62424
Local[5]..........: 1015a478
Local[6]..........: e623f0
Operand[1]........: e632ac

....

have you found any solution?

 

 

Nothing wrong with the code mentioned in the first post.

Could be that you are not building the class file defined.

Rgds,

seetesh