JBuilder9下运行J2ME3D总是出错。

按着网上教程做的总出错！请J2ME大师给点指导！
我的环境变量配置：
JAVA_HOME=F:\JBuilder9\jdk1.6.0_10
PATH=%JAVA_HOME%\bin;%path%
classpath=.;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar

运行结果：

F:\JBuilder9\WTK2.5.2\bin\emulator.exe -classpath "F:\M3GCube\classes;"  -Xdevice:DefaultColorPhone  -Xdescriptor:"F:\M3GCube\jad-temp\M3GMIDlet.jad"
Running with storage root C:\Documents and Settings\Administrator\j2mewtk\2.5.2\appdb\temp.DefaultColorPhone56

Running with locale: Chinese_People's Republic of China.936

Running in the identified_third_party security domain

Unable to create MIDlet M3GMIDlet

java.lang.ClassNotFoundException: M3GMIDlet

    at com.sun.midp.midlet.MIDletState.createMIDlet(+29)

    at com.sun.midp.midlet.Selector.run(+22)
----------------解决方案--------------------------------------------------------
不用jbuilder，用eclipse就行了
----------------解决方案--------------------------------------------------------