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What reason cause this exception messages when i debug MIDlet on phoneME?

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dimensioll
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Joined: 2008-07-03

Hi, all!

Here list the message:

Initializing jdb ...
>
VM Started: No frames on the current call stack

Thread1[1] run
>
Exception occurred: java.lang.NullPointerException (to be caught at: com.sun.midp.lcdui.DisplayEventHandlerFactory.getDisplayEventHandler(), line=84 bci=23)No frames on the current call stack

Thread1[1] run
>
Exception occurred: java.lang.ClassNotFoundException (to be caught at: com.sun.midp.content.CHManager.getManager(), line=113 bci=56)No frames on the current call stack

Thread1[1] stop at HelloWorld:13
Deferring breakpoint HelloWorld:13.
It will be set after the class is loaded.
Thread1[1] run
> Set deferred breakpoint HelloWorld:13

Breakpoint hit: "thread=Thread277", HelloWorld.commandAction(), line=13 bci=0
13 if(displayable == form0){

Thread277[1]

Question one: VM Started: No frames on the current call stack
Question two:Exception occurred: java.lang.NullPointerException
Question three:Exception occurred: java.lang.ClassNotFoundException

And then all thing is OK. What reason cause above exception messages when i debug MIDlet on phoneME?