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ClassFormatError compiling and running a Java (Mobile) prog? [message #739768]

Mon, 17 October 2011 20:52

Alex Kerr

Messages: 18
Registered: October 2009

Junior Member

When I run a Java Mobile program (CLDC 1.0, MIDP 2.0) I've been writing I get the following output (see below) from the JavaME Platform SDK 3.0 JavaME phone emulator, in the Eclipse Console. However, when I run exactly the same code in Netbeans 7.0, also using the exact same Java Platform SDK emulator, everything just runs as it should. Weird!

Anyone got any clues please? Thank you.

Output in Eclipse console:

Installing suite from: http://127.0.0.1:64391/AlphaMobile.jad

****warning****
****Untrusted user classes must never be put
****on the system class path
****warning****

TRACE: <at java.lang.Error: ClassFormatError: 154>, startApp threw an Exception
java.lang.Error: ClassFormatError: 154
- java.lang.Class.invoke_verify(), bci=0
- java.lang.Class.initialize(), bci=117
- AlphaMain.startApp(), bci=0
- javax.microedition.midlet.MIDletTunnelImpl.callStartApp(), bci=1
- com.sun.midp.midlet.MIDletPeer.startApp(), bci=7
- com.sun.midp.midlet.MIDletStateHandler.startSuite(), bci=269
- com.sun.midp.main.AbstractMIDletSuiteLoader.startSuite(), bci=52
- com.sun.midp.main.CldcMIDletSuiteLoader.startSuite(), bci=8
- com.sun.midp.main.AbstractMIDletSuiteLoader.runMIDletSuite(), bci=161
- com.sun.midp.main.AppIsolateMIDletSuiteLoader.main(), bci=26
java.lang.Error: ClassFormatError: 154
- java.lang.Class.invoke_verify(), bci=0
- java.lang.Class.initialize(), bci=117
- AlphaMain.startApp(), bci=0
- javax.microedition.midlet.MIDletTunnelImpl.callStartApp(), bci=1
- com.sun.midp.midlet.MIDletPeer.startApp(), bci=7
- com.sun.midp.midlet.MIDletStateHandler.startSuite(), bci=269
- com.sun.midp.main.AbstractMIDletSuiteLoader.startSuite(), bci=52
- com.sun.midp.main.CldcMIDletSuiteLoader.startSuite(), bci=8
- com.sun.midp.main.AbstractMIDletSuiteLoader.runMIDletSuite(), bci=161
- com.sun.midp.main.AppIsolateMIDletSuiteLoader.main(), bci=26

[Updated on: Mon, 17 October 2011 20:57]

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Re: ClassFormatError compiling and running a Java (Mobile) prog? [message #740060 is a reply to message #739768]

Tue, 18 October 2011 05:32

Satyam Kandula

Messages: 444
Registered: July 2009

Senior Member

MTJ could be the right forum for this question. I don't know about that properly but my question would be - did you configure your project to generate class files compatible with CLDC 1.1?

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Re: ClassFormatError compiling and running a Java (Mobile) prog? [message #740294 is a reply to message #740060]

Tue, 18 October 2011 10:58

Alex Kerr

Messages: 18
Registered: October 2009

Junior Member

> MTJ could be the right forum for this question

Only MTJ forum I can see is about the development of MTJ itself, so assumed this forum was the best fit!?

> did you configure your project to generate class files compatible with CLDC?

Well, I'm not sure. I set Project->Properties->Java Compiler settings to be Compiler Compliance Level as 1.3 and Source Compatibility to be 1.3 also, and then "Generated .class files compatibility" to be CLDC 1.1. Same result. And I've also tried all those as 1.4 and 1.6 and 1.5 too. Nothing makes a difference!

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