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

[Darin Wright <Darin_Wright@xxxxxxxxxx>]

_expression_ evaluation is supported on
all Java VMs that support message sending via JDI and have a class library
with the method java.lang.Class.classForName(String, boolean, String).

Darin Wright

"Zhuohui Qiu" <zqiu@xxxxxxx>
Sent by: platform-debug-dev-bounces@xxxxxxxxxxx

10/25/2007 03:48 PM

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Subject	RE: [platform-debug-dev] A j2me debug problem

Hey Darin,

Do you mean the _expression_ evaluation is not tested with J2ME? Or it is
not supposed to support J2ME? :-)

Thanks.

- Raymond

-----Original Message-----
From: platform-debug-dev-bounces@xxxxxxxxxxx
[mailto:platform-debug-dev-bounces@xxxxxxxxxxx] On Behalf Of Darin
Wright
Sent: Thursday, October 25, 2007 4:18 PM
To: Eclipse Platform Debug component developers list.
Subject: RE: [platform-debug-dev] A j2me debug problem

Sorry, we have not had a chance to dig into the problem.

Our implementation of _expression_ evaluation relies on retrieving classes

via Class.classForName(...). If you have time to discover an alternate
way 
to do this with J2ME libraries, that would be helpful.

Darin Wright




"Zhuohui Qiu" <zqiu@xxxxxxx> 
Sent by: platform-debug-dev-bounces@xxxxxxxxxxx
10/25/2007 09:08 AM
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<platform-debug-dev@xxxxxxxxxxx>


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Subject
RE: [platform-debug-dev] A j2me debug problem






Does anyone know how to do _expression_ evaluation with J2ME?
I really need help on this problem. 
 
Thanks.
 
- Raymond

From: platform-debug-dev-bounces@xxxxxxxxxxx 
[mailto:platform-debug-dev-bounces@xxxxxxxxxxx] On Behalf Of Zhuohui Qiu
Sent: Wednesday, October 17, 2007 10:36 AM
To: Eclipse Platform Debug component developers list.
Subject: RE: [platform-debug-dev] A j2me debug problem
 
Hey,
 
Thanks for your answers. 
 
I talked to our VM architects about this issues and they said 
there is nothing in JDWP that says you have to support ClassLoader.
Here, I am giving a really test case to show the error I got:
I input _expression_:
 
System.out.println("Hello World");
 
When I executed this line, I got:
 
Evaluation failed. Reason(s):
            Type does not implement selector
forName and signature 
(Ljava/lang/String;ZLjava/lang/ClassLoader;)Ljava/lang/Class; 
 
When eclipse _expression_ evaluator is asking for
com.sun.jdi.ReferenceType
of a class, it is looking for 
(Ljava/lang/String;ZLjava/lang/ClassLoader;)Ljava/lang/Class;
but what we have is ()Ljava/lang/Class. The search actually occurs in 
org.eclipse.jdi.internal.PrferenceTypeImpl#methoByName(String, String);
 
I think eclipse can also be used to develop J2ME programs, have any one
tried _expression_ evaluation function in any J2ME program?
 
Thanks.
 
- Raymond
 
-----Original Message-----
From: platform-debug-dev-bounces@xxxxxxxxxxx 
[mailto:platform-debug-dev-bounces@xxxxxxxxxxx] On Behalf Of Craig
Setera
Sent: Wednesday, October 17, 2007 9:08 AM
To: Eclipse Platform Debug component developers list.
Subject: Re: [platform-debug-dev] A j2me debug problem
 
I don't think this is an issue with Java ME, but with the JDWP bridging
that most of the toolkits provide.  Those bridges do not provide full
specification support.  I have not seen any type of evaluation in
the 
remote VM work.  I guess the question is whether the Netbeans tools
are 
able to coax more information out of the ME VM's.
 
Darin Wright wrote:
> 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
> Please respond to
> "Eclipse Platform Debug component developers list." 
> <platform-debug-dev@xxxxxxxxxxx>
> 
> 
> To
> <platform-debug-dev@xxxxxxxxxxx>
> cc
> 
> 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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