How do Standard class based exceptions understand an exception?

Dear All,
Can any one explain how does the standard class based exceptions understand and identify the specific exception. For example CX_SY_ZERODIVIDE is an exception class we use to catch the divide by zero exception. How does the class understand it. To clear my point please refer the code below
data: v1 type i,
v2 type i.
try.
v2 = v1 / 0.
catch CX_SY_ZERODIVIDE.
The above code will work and an exception will be handled properly. But how??
suppose if i write..
try.
v1 = Apple
catch CX_SY_ZERODIVIDE.
it obviously doesnt work.
so my point is how does an exception class understand the exception?
I have very poor knowledge about it, i have checked the class CX_SY_ZERODIVIDE and its methods. There is no code in it. .
Any help would be greatly appreciated.
Thanks and Regards,
Abdullah.

1) You can write your own log class. Call the log method from your catch
2) Upgrade to JDK1.4.0 and you can use the Logger function
3) Check jakarta for log4j

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      RAISE EXCEPTION TYPE zcx_my_exception.
ENDCASE.
But what I really want for WHEN 2 is the class based exception of
MESSAGE sy-msgid TYPE sy-msgty NUMBER sy-msgno WITH sy-msgv1...
I.e., in my calling code, I want to catch the exception, and display whatever the original error message was as generated by the ENQUEUE function module.
I suppose I could do this
DATA: ls_error TYPE scx_t100key.
WHEN 2.
ls_error-msgid = sy-msgid.
ls_error-msgty = sy-msgty.
ls_error-msgno = sy-msgno.
RAISE EXCEPTION TYPE zcx_my_exception EXPORTING textid = ls_error
but I can't help feel I'm missing something staggeringly obvious...
matt

Hi Matt,
this may sound too simple:
For me the real advantage of class-based-exception is that they can be raised in an inner block and caught in an outer block at any level.
I never use the exception attributes to communicate any details, but use
IF SY-SUBRC NE 0.
MESSAGE sy-msgid TYPE sy-msgty NUMBER sy-msgno WITH sy-msgv1... INTO lv_string.
Raise Exception type zcx_my_exception.
ENDIF.
Catching the exception I may (roughly) know where it comes from. As the message variables are present, I can check their values or repeat the MESSAGE without INTO. The main function of MESSAGE INTO is for transparency, the ability to see the whole message in debugger in lv_string and the where-used-list if message is created by programmer..
If I really need different reaction for different SY-SUBRC ( = different untyped exception), I'd rather create different class-based exceptions. This helps transparency.
In other oo language you do not have an ABAP message concept with everywhere-present message variables. Why use this crutch of putting the message variable filled by functions exception into exception object attributes only to convert them back to message output?
I prefer [KISS|http://en.wikipedia.org/wiki/KISS_principle].
Regards,
Clemens

How to construct a standard rowKeyStr based on a value passed to a method ?

Hi to all im on a proyect and i really appreciate some people can help with this
looking ADF joins all use rowKey values and i need to know how to generate a standard rowKeyStr based on a value passed to an event, so it let me access any page on my Jsp ADF application and pass some values to a method and get the rowKeyStr.
i have this method actually getting the current row, how i can generate a standard rowKeyStr value.
public String myrowKeyStr(String id) {
if (id != null) {
PbeVisitasViewImpl vo = (PbeVisitasViewImpl)getPbeVisitasView1();
Key k = new Key(new Object[]{id});
Row[] found = vo.findByKey(k,1);
vo.setCurrentRow(vo.findByKey(k,1)[0]);
return someRowKeyStr;
}

once you do the
Key k = new Key ( new Object[] { p1 } );
The rowkeystring comes from:
String strRowKeyStr = k.toStringFormat();
Just type k. and press ctrl-space to see the list of methods.

How to use standard classes to create custom modulepool program like ME21N

I am at the Starting Point of doing a classical dynpro program via Abap Objects which address all controls with MVC Architecture .So i debugged the standard ME21n transaction to find out how i can start with. I came across this interface which has no Attributes and Methods.I wondered y .Thats y i posted a Question .I also seen a lot of Standard classes
CL_TABLE_VIEW_MM
CL_BASIC_MODEL_VIEW_MM
CL_COMPOSITE_SCREEN_VIEW_MM
CL_SCREEN_VIEW_MM
CL_TABLE_VIEW_MM
CL_TABSTRIP_VIEW_MM
CL_TC_BUTTON_VIEW_MM
CL_TC_ITEM_VIEW_MM
CL_TOGGLE_VIEW_MM
CL_VALUE_MODEL_VIEW_MM
and much more for Model and Controllers ..Can u plz guide me how i can make use of this classes effictively in my custom module pool programming

I think all these classes serve the purpose of embracing the basic ones and are used specificalty in MM module.
If you want to create similar module pool program with nice expand/collapse buttons in relation to subscreens please refer the some tips [here|expand/collapse button functionality on module pool screen;
Also there are transactions like BIBS, DWDM which you can follow the examples from. I think SAP has covered all GUI controlls there so you can create really complex programs with various GUI controlls independently of module used for.
Of course you can still stick to classes you mentioned but I think the better is to learn some standard approach of creating such screens, then if you feel more advanced go for using module specific ones if you really need that.
Regards
Marcin

How to change standard class private section code

Dear experts,
I need to add new attributes in a standard class as per one OSS note. I took access key to add new attributes. I have a question.
class name: CL_J_1BEFD
Attribute: MT_GROUP_C350
Level: Instance
Visibility: Private
Type STANDARD TABLE OF mty_result
How do i add the instance attribute because i do not want to give the typing and associated type. instead i have to declare data: MT_GROUP_C350 type standard table of mty_result in class builder private section code.
if you look at the pushbutton between Associated type and Description, for all instance attributes there's a green color lining below the arrow. I want my attribute also to be exactly same.
Though i have access key, in private section the display<->Change button is disabled.
Please suggest me how do i add code in private section of a standard class. i have required access key to change the class.
Thanks,
Rajesh.

Hi ,
Please follow the OSS note 1828074 - Syntax error in LSEPA_MANDATE_UI_LISTF01 / visibility of the method "GET_SELECTED_MANDATES" to change visibility section of a standard class.
Regards,
Chetan

Where-used list for class-based exception texts

G'Day,
With traditional exceptions, one can look at a message, go to SE91 and do a where-used for that particular message. This is not possible with ZCX classes, a where-used can be done for the entire class but there doesn't seem to be a way to find where individual exception texts are raised.
Now whilst exception classes do offer the possiblity of a far better structuerd approach that reduces the need for a where-used in first place, this is still a shortcoming of exception classes... or is it? (or am I missing some other way to search for it?)
Cheers,
Mike

D'Oh! That one was so obvious that I was blinded by it
(Believe it or not I've been using ex. classes for some time!)
However it still leaves another issue (which was actually the one that sparked this debate here in the office): In the old message concept it was far easier to navigate from an error to find the offending code. One could click on a message, see the message class/ID, drop into SE91 and (provided the where used is small enough) go straight to the offending code via a where-used.
Unless class-based exceptions are caught and re-raised as an old MESSAGE statement with a message number, this is not so simple anymore. Or is it?
Thanks,
Mike

How to pass parameter to the custom class based on CL_RSR_WWW_MODIFY_TABLE

Hello
I created custom class based on CL_RSR_WWW_MODIFY_TABLE in order to modify web template.
I would like to pass parameter to this class. How is it possible?
HUGE thanks!

Hello ,
Various methods will be given for the class like CAPTION_CELL CHARACTERISTIC_CELL:
Position the cursor on the name of the method and click on 'Redefine' , where you will get the parameters used in the method such as I_X, I_COLSPAN, where you can define your logic.
hope it helps
assign points if useful

How do I assign a css class based on spry data?

I need to assign a css class based on the value of spry data. IOW - I need to do a calculation on two values and assign a class to that <tr> if the resulting value if > 0. Is it possible to plug spry data into php? Is there a better way to go about doing this? Spry may have a function that will hide or style data based on the value of that data, but I can't find it.

I think I need to provide better information. I currently have:
<tbody spry:repeatchildren="JSCC_Courses" spry:choose="choose" >
 <tr spry:when="'{method}' == 'WEB'" style="background-color: #fffdc7;">
 <td>{callno}</td>
 <td>{rubric}</td>
 <td>{session}</td>
 <td>{hours}</td>
 <td>{title}</td>
 <td>{days}</td>
 <td>{time}</td>
 <td>{room}</td>
 <td>{instructor}</td>
 <td>{seats}</td>
 <td>{location}</td>
 </tr>
 <tr spry:when="'{method}' == 'VDC'" style="background-color: #cbffc7;" >
 <td>{callno}</td>
 <td>{rubric}</td>
 <td>{session}</td>
 <td>{hours}</td>
 <td>{title}</td>
 <td>{days}</td>
 <td>{time}</td>
 <td>{room}</td>
 <td>{instructor}</td>
 <td>{seats}</td>
 <td>{location}</td>
 </tr>
 <tr spry:default="default">
 <td>{callno}</td>
 <td>{rubric}</td>
 <td>{session}</td>
 <td>{hours}</td>
 <td>{title}</td>
 <td>{days}</td>
 <td>{time}</td>
 <td>{room}</td>
 <td>{instructor}</td>
 <td>{seats}</td>
 <td>{location}</td>
 </tr>
</tbody>
I now need to add a class to the <tr> if the {seats} > 0. I'm having trouble conceptualizing how this works in conjunction with my current spry:whens.

How to use method of Standard Class

Hi all,
I want to call a pop up in pcui screen in some standard application with some text. I have made Zclass of standard SAP class which i am using (cl_bsp_accmod_contact in CRM system).
I think i have to call 'PRINT_STRING' method of standard class CL_BSP_ELEMENT.
I am trying to use this code: 

data: lr_data type ref to cl_bsp_element.
concatenate html 'rohit' into html. (html is a string)
lr_data->print_string( html ).
but it gives a dump:
You attempted to use a 'NULL' object reference (points to 'noth
access a component (variable: "lr_data").
An object reference must point to an object (an instance of a class)
before it can be used to access components.
I dont know how to assign object reference to an object???
Plz help me in this regard,
Thanks in advance,
Rohit

Hi ,
try and use :
data: lr_data type ref to cl_bsp_element.
concatenate html 'rohit' into html. (html is a string)
lr_data->print_string( html = html ).
You are creating a variable...but not passing the value to the parameter...it is exactly like callin get_data or get_cell_value...!!
Hope this helps.
Do reward each useful answer.
Thanks,
Tatvagna.

How do Standard class based exceptions understand an exception?

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