Re: [platform-debug-dev] A j2me debug problem

[Darin Wright <Darin_Wright@xxxxxxxxxx>]

The Java debugger's evaluation support is performed by interpretting an 
expression and sending JDI commands over the socket to the target VM. We 
basically parse the expression in to an AST, and then visit the AST to 
interpret the expression. At various times we need to resolve class 
objects - for example when referencing a static field, sending a static 
message, etc. To do this, we look up the class by name. We use the method:

        public static Class forName(String name, boolean initialize, 
ClassLoader loader)

If this method is not in the J2ME libraries, the evaluation will fail 
(currently). Is there an equivalent method we could use for J2ME?

Darin Wright




"Zhuohui Qiu" <zqiu@xxxxxxx> 
Sent by: platform-debug-dev-bounces@xxxxxxxxxxx
10/16/2007 05:33 PM
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Subject
[platform-debug-dev] A j2me debug problem






Hey, 
 
Our plug-in is supposed to work with our simulator which is running in
j2me. For some reason, Eclipse can not execute expression evaluation 
properly
on the project running on our simulator (we have a debugger running on the 

simulator and it talks to the eclipse debugger). It seems the reason is 
eclipse is 
running in J2SDK environment and our simulator is running in J2ME 
environment, 
there is some problem in the communication. 
 
I did some debug to find out the reason and have found that eclipse 
debugger
has some problem when it tries to get the IJAvaType of an object, e.g. 
java.lang.Class. 
In the Eclipse's implementation of com.sun.jdi.ReferenceType class, 
eclipse tries
to use the methodsByName() method to find the object type; the passed in 
selector 
is “forName”, and the signature is 
“(Ljava/lang/String;ZLjava/lang/ClassLoader;)Ljava/lang/Class;”.
The problem is that the signature of “forName” item in the visible methods 
list of 
ReferenceTypeImpl of eclipse is “()Ljava/lang/Class;”, thus, eclipse 
throws an 
exception that it can not find the class type.
 
It seems that J2ME does not support reflection but exlipse expression 
evaluator is 
asking for that information. So, the question could be how does eclipse do 
expression
evaluation with J2ME?

I tried to install the DSF-SDK and mtj-sdk, but the problem is still
there. Can anyone tell me what I should do? 
 
Thanks.

Raymond
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