ABAP Objects Casting error

Hi,
I have declared two classes with names, ZCL_ONE, ZCL_TWO.
ZCL_TWO is inhering ZCL_ONE.
Now i am using them in the se38 program.
While i use it, Narrow casting is working fine, But widening casting is not working.
It is throwing an exception or a dump if i do not catch an exception.
Code:
DATA: OBJ1 TYPE REF TO ZCL_ONE,
OBJ2 TYPE REF TO ZCL_TWO.
CREATE OBJECT OBJ1.
OBJ2 ?= OBJ1.
The above code is giving me dump. Any guesses about how to solve it.
I am able to work with the Narrow casting.. which is below code.. It is working fine.
DATA: OBJ1 TYPE REF TO ZCL_ONE,
OBJ2 TYPE REF TO ZCL_TWO.
CREATE OBJECT OBJ2.
OBJ1 = OBJ2.
How to resolve the error.
Thanks in Advance.

obj1 should be the super(inherited) class of obj2....while using widening cast....
example:
INTERFACE i1.
DATA a1 TYPE ...
ENDINTERFACE.
INTERFACE i2.
INTERFACES i1.
ALIASES a1 FOR i1~a1.
DATA a2 TYPE ...
ENDINTERFACE.
CLASS c1 DEFINITION.
PUBLIC SECTION.
    INTERFACES i2.
ENDCLASS.
CLASS c2 DEFINITION INHERITING FROM c1.
PUBLIC SECTION.
    METHODS m1.
ENDCLASS.
DATA: iref TYPE REF TO i2,
      cref TYPE REF TO c1.
CREATE OBJECT iref TYPE c2.
... iref->a1 ...
... iref->a2 ...
TRY.
cref ?= iref.
CALL METHOD cref->('M1').
CATCH cx_sy_move_cast_error
        cx_sy_dyn_call_illegal_method.
ENDTRY.
Message was edited by:
        Muthurajan Ramkumar

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BPS Flat file load ABAP objects migration error.

Hello
We are trying to load a flat file via the SAP-GUI and BPS and everything works well in DEV based on the HOw-TO guide. When trying to move the ABAP objects to QA, we get a migration error on the type /1sem/_yth_data_260ZBYAPEPL. Of course the 260ZBYAPEP is relevant to our configuration and in QA we do have the equivalent structure /1sem/_yth_data_614ZBYAPEPL.
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YB.

Dear YB,
the element /1sem/_yth_data_260ZBYAPEPL has to be changed according to the QA manually only. Sytem can't change the clent no. automaticaaly when u transport to the QA.
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Object casting: confusion in ABAP Objects: Complete Reference book

Hi,
During Object Assignments using casting, is a Type Test carried out during the syntax check or at runtime?
A.5.2.2 (page 1008) of 'ABAP Objects: The Complete Reference' says about Widening Cast: "...you must check at runtime...". However on the next page under A.5.3.2 it says of Widening Cast in Data References: "The syntax check precludes...".
A.5.4 (page 1010) concerns Assignments between Object Reference Variables, but makes no mention of whether checks are carried out by a syntax check or at runtime.
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William,
Your questions can be answered by the following rule for object references, which I found in the book "ABAP Objects" by Horst Keller and Sascha Krüger:
"... that the static type of the target variable must be equal to or more general than the dynamic type of the source variable."
Here "static type" means the type with which an object reference variable is declared. "Dynamic type" is the type that the object reference variable has at runtime. The dynamic type of an object reference is always more special than its static type, otherwise a runtime error occurs.
With this rule all your questions can be answered:
1. The Narrowing Cast is always checked during the syntax check. Example:
DATA o_ref1 TYPE REF TO object.
DATA o_ref2 TYPE REF TO class_1.
o_ref1 = o_ref2.
Here the reference o_ref2 has a dynamic type "class_1" or a subclass of it, which is narrower than its static type "class_1", which is narrower than the static type "object" of the reference o_ref1. Therefore, the syntax check says that the assignment is OK.
2. The Widening Cast is always checked at runtime and requires an assignment using the operator ?=. If you use the operator = in the assignment, a syntax error occurs. Therefore the following example produces a syntax error (try it yourself):
DATA o_ref1 TYPE REF TO object.
DATA o_ref2 TYPE REF TO class_1.
o_ref2 = o_ref1.
The correction for this syntax error is:
DATA o_ref1 TYPE REF TO object.
DATA o_ref2 TYPE REF TO class_1.
o_ref2 ?= o_ref1.
Now the syntax check is satified, and the correctness of the widening cast is checked at runtime.
Kind regards,
Michael Kraemer
Message was edited by: Michael Kraemer

Casting in ABAP Objects

Why the cast error generates only in Widening cast?

Hi Shyam,
WELCOME TO SDN!!!
Please check this link
http://abapprogramming.blogspot.com/2007/10/oops-abap-8.html
The widening cast in this case does not cause an error because the reference airplane actually points to an instance in the subclass lcl_cargo_airplane. The dynamic type is therefore u2018REF TO lcl_cargo_airplaneu2019.
Here the widening cast produces the MOVE_CAST_ERROR runtime error that can be caught with u201CCATCH ... ENDCATCHu201D, because the airplane reference does not point to an instance in the subclass lcl_cargo_airplane, but to a u201Cgeneral airplane objectu201D. Its dynamic type is therefore u2018REF TO lcl_airplaneu2019 and does not correspond to the reference type cargo_airplane.
The widening cast logically represents the opposite of the narrowing cast. The widening cast cannot be checked statically, only at runtime. The Cast Operator u201C?=u201D (or the equivalent u201CMOVE ... ?TO u2026u201D) must be used to make this visible.
With this kind of cast, a check is carried out at runtime to ensure that the current content of the source variable corresponds to the type requirements of the target variables. In this case therefore, it checks that the dynamic type of the source reference airplane is compatible with the static type of the target reference cargo_airplane. If it is, the assignment is carried out. Otherwise the catchable runtime error u201CMOVE_CAST_ERRORu201D occurs, and the original value of the target variable remains the same.
Best regards,
raam

Error : while converting a WD ABAP object into SAP Transaction

Hi,
I am trying to converting a WD ABAP object into SAP Transaction but i am getting the following error while executing the transaction :
Network Access Message: The page cannot be displayed
Technical Information (for Support personnel)
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> ISA Server is not configured to allow SSL requests from this port. Most Web browsers use port 443 for SSL requests. (12204)
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Error in TP Abap Objects Programs to MiniWAS 6.20

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I have install the MiniWAS 6.20 to my pc and I am trying to transport the ABAP OBJECTS programs by following the instractions. Unfortunately, the tp ended with error code 8 and the message is:
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You can ignore this message, S_ITAB_ACCESS has a syntax error (you can check in se38).
In 46C the syntax was a little bit different:
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Since you cannot change program S_ITAB_ACCESS, there is not much you can do with the transport.
* READ TABLE tab WITH TABLE KEY table_line = key
READ TABLE tab WITH KEY table_line = key
Incho

Casting error ABAP dump...

Hello, I am getting issue when casting is done. I get a ABAP dump. In the constructor of call following code is there. I get dump during "refCX_SubRC ?= Imp_ExcObj_Ref. "" object casting"
IF EXC_CLASS_NAME CS 'ZCX_AL_SUBRC'.
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Source type, "\PROGRAM=Y4MIG_DIT\CLASS=ZCX_AL_SUBRC"
Target Type, "CLASS=ZCX_AL_SUBRC".
Regards,
Jainam

Hi.
Please try.
TRY.
It is Cast here.
refCX_SubRC ?= Imp_ExcObj_Ref. "" object casting
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ENDTRY.

ABAP Object (Up cast, Down Cast)

Someone should let me know.
Version 4.70 Enterprise was as follows.
" Up Cast (Narrowing-Cast)
superclass = subclass.
" Down Cast (Widening-Cast)
subclass ?= superclass.
It is why the help of F1 is changed as follows from the version ECC 6.0.
(Widening-Cast and Narrowing-Cast became reverse.)
" Up Cast (Widening-Cast)
superclass = subclass.
" Down Cast (Narrowing-Cast)
subclass ?= superclass.

Hello Tayori,
You are referring to the link: [ABAP Objects: Narrowing Cast (Upcasting) |http://help-abap.blogspot.com/2008/09/abap-objects-narrowing-cast-upcasting.html], than you must have read the discussion between me and Christian.
I am not clear why SAP has changed the definition.
I am on ECC 5.0 and in my F1 defintion it says Narrowing Cast = Upcasting.
It is better not to use Upcasting or Downcasting terms, as they are with the reference of the your view of Inheritence Tree. So, we can stick to the standard terms like Narrowing and Widening Cast.
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Like: BMW to CAR
Widening: "Less Specific View of an ojbect" to "More Specific view"
Like: CAR to BMW
Regards,
Naimesh Patel

Logical Database in Abap Objects

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Is this possible ??? But when I make a GET <node>, occurs the following error:
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I'm doing the following:
CLASS MONFIN IMPLEMENTATION.
 METHOD TRAER_DATOS.
 GET VBRK.
 ENDMETHOD.
ENDCLASS.
Please, somebody tell me how I use the logical database in Abap Objects.
Thank you very much
Regards
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Hi there
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If you want to use a logical database in an abap OO program I would create a special class which just does the get data from your DB and pass this either at record or table level.
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Exception 'error_message' in ABAP Objects

I've got a heterogeneous scenario with new program parts in ABAP objects and older parts in classical ABAP.
In the older parts some R/3 standard functions are called which dump dialog messages which are not allowed at that state of the program flow ('on commit').
The simple solution in classical ABAP was to use standard exception 'error_message' in the top level 'call function' statement thus catch all dialog messages in lower levels.
I am looking for an analog solution in object oriented ABAP. But exception 'error_message' is not allowed with 'call method'. It cannot be defined statically in the methods declaration. And the system exception caused by the dialog error message is not included in the set of catchable system errors.
I would be grateful for any hints concerning this problem.

Hi
Excuse me! But I didn't want to sent you my answer.
Anyway:
CLASS lcl_my_class DEFINITION.
PUBLIC SECTION.
    METHODS my_method
              EXPORTING
                EXCEPTION TYPE CHAR1
              EXCEPTIONS error_messages.
ENDCLASS.                    "LCL_MY_CLASS DEFINITION
CLASS lcl_my_class IMPLEMENTATION.
METHOD my_method.
    IF EXCEPTION = 'X'.
      MESSAGE e208(00) WITH 'Message error'
                  RAISING error_messages.
    ELSE.
      MESSAGE I208(00) WITH 'OK!'.
    ENDIF.
ENDMETHOD.                    "MY_METHOD
ENDCLASS.                    "LCL_MY_CLASS IMPLEMENTATION
So you did want to do a call like this:
CALL METHOD lcl_my_class=>my_method
   EXCEPTIONS
     error_messages = 1
     error_message = 2
     OTHERS         = 3.
No! you can't do it, but you try to insert your call in fm where you use ERROR_MESSAGE addition. I think you can do it if your methods are std.
Max
Message was edited by: max bianchi

How to use LDB PNP with ABAP objects in a program

Hello,
I am wondering if anybody has used the HR logical database(LDB) PNP with user defined ABAP objects in a program? I am using the FM- LDB_PROCESS but its not working. Also assigning PNP in the attributes section of the program -- so that I can use predefined fields from the LDB and then invoking the FM doesn't work -- throwing 'Logical database already active' error.
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I would really appreciate if anyone could show me some insight regarding this. Thank you.
Kshitij R. Devre

Hi Kshitij
It would be really good if we could use both together. But as I know, it is not possible. "GET pernr." is an event-like loop statement and so cannot be used in OO context. And I guess, the same restriction holds for the "LDB_PROCESS" since it uses LDB-specific processing.
What I suggest you is to use standard and BAPI functions.
Sorry for giving bad news...
*--Serdar

Cast error in java sound

Hey, i got a little run-time error:
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: com.sun.media.sound.PortMixer$PortMixerPort
the code segment it occurs at is here:
case 0:
targetDataLine1 = (TargetDataLine)mixer1.getLine(targetInfo);
targetDataLine2 = targetDataLine1;
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If you need more info, just tell me.

But still, the tutorial I looked at
(http://java.sun.com/j2se/1.5.0/docs/guide/sound/progr
ammer_guide/chapter3.html#113154)
still showed it down-casting from a Line object to a
TargetDataLine object.
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// obj is a reference of type Object. The object it points to is a String:
Object obj = "I am a String";
// Which explains why this works:
String s = (String)obj;
// and why this fails:
Integer i = (Integer)obj;
Not to mention, the java API says that the
getLine(Line.Info) object returns an object of type
Line.
And I still don't understand why you can't cast from
a superclass to a subclass. I know intuitively, it
makes since, since not all RECTANGLES are SQAURES,
but all SQUARES are RECTANGLES. But still, I know
enough programming to remember numerous instances of
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SAP NetWeaver 2004s ABAP Trial Version - error code = 200

Hi all,
installation of SAP NetWeaver 2004s ABAP Trial Version
which was attached to the book ABAP-Objects ends again and again with
ProductException: (error code = 200; message="Java error"; exception = java.lang.Exception)
Attached you find information about
   1) Host-file
   2) Network connections
   4) Error - Log
It seems that the      [#    [#]
echo                7/tcp
echo                7/udp
discard
           9/tcp    sink null
discard             9/udp    sink null
systat             11/tcp    users
     #Active users
systat             11/tcp    users                  #Active users
daytime            13/tcp
daytime
           13/udp
qotd               17/tcp    quote                  #Quote of the day
qotd               17/udp    quote
              #Quote of the day
chargen            19/tcp    ttytst source          #Character generator
chargen
4) == E R R OR L O G ================================================
(Jan 1, 2007 1:07:15 PM), Install, com.sap.installshield.sdcstepswrapper.StepWrapperInstallFiles, err,
an error occurred and product installation failed. Look at the log file D:SAPNSPlog.txt for details.
(Jan 1, 2007 1:07:15 PM), Install, com.sap.installshield.sdcstepswrapper.StepWrapperInstallFiles, err,
ProductException: (error code = 200; message="Java error"; exception = java.lang.Exception)
STACK_TRACE: 15
ProductException: (error code = 200; message="Java error"; exception = java.lang.Exception)
     at com.sap.installshield.sdcstepswrapper.StepWrapperInstallFiles.execute(StepWrapperInstallFiles.java:254)
     at com.sap.installshield.sdcstepswrapper.StepWrapperInstallFiles.executeAllSteps(StepWrapperInstallFiles.java:224)
     at com.sap.installshield.sdcstepswrapper.StepWrapperInstallFiles.executeAllInstallationSteps(StepWrapperInstallFiles.java:177)
     at com.sap.installshield.sdcstepswrapper.StepWrapperInstallFiles.install(StepWrapperInstallFiles.java:268)
     at com.installshield.product.service.product.PureJavaProductServiceImpl.installProductAction(Unknown Source)
     at com.installshield.product.service.product.PureJavaProductServiceImpl$InstallProduct.getResultForProductAction(Unknown Source)
     at com.installshield.product.service.product.InstallableObjectVisitor.visitComponent(Unknown Source)
     at com.installshield.product.service.product.InstallableObjectVisitor.visitInstallableComponents(Unknown Source)
     at com.installshield.product.service.product.InstallableObjectVisitor.visitProductBeans(Unknown Source)
     at com.installshield.product.service.product.PureJavaProductServiceImpl$InstallProduct.install(Unknown Source)
     at com.installshield.product.service.product.PureJavaProductServiceImpl$Installer.execute(Unknown Source)
     at com.installshield.wizard.service.AsynchronousOperation.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
(Jan 1, 2007 1:12:17 PM), Install, com.installshield.product.service.product.PureJavaProductServiceImpl$InstallProduct, err,
An error occurred and product uninstallation failed. Look at the log file D:SAPNSPlog.txt for details.
(Jan 1, 2007 1:12:17 PM), Install, com.sap.installshield.sdcstepswrapper.StepWrapperInstallFiles, err,
ProductException: (error code = 200; message="Java error"; exception = java.lang.Exception)
STACK_TRACE: 15
ProductException: (error code = 200; message="Java error"; exception = java.lang.Exception)
     at com.sap.installshield.sdcstepswrapper.StepWrapperInstallFiles.execute(StepWrapperInstallFiles.java:254)
     at com.sap.installshield.sdcstepswrapper.StepWrapperInstallFiles.executeAllSteps(StepWrapperInstallFiles.java:224)
     at com.sap.installshield.sdcstepswrapper.StepWrapperInstallFiles.executeAllUninstallationSteps(StepWrapperInstallFiles.java:192)
     at com.sap.installshield.sdcstepswrapper.StepWrapperInstallFiles.uninstall(StepWrapperInstallFiles.java:313)
     at com.installshield.product.service.product.PureJavaProductServiceImpl.uninstallProductAction(Unknown Source)
     at com.installshield.product.service.product.PureJavaProductServiceImpl$InstallProduct.processActionsFailed(Unknown Source)
     at com.installshield.product.service.product.InstallableObjectVisitor.visitComponent(Unknown Source)
     at com.installshield.product.service.product.InstallableObjectVisitor.visitInstallableComponents(Unknown Source)
     at com.installshield.product.service.product.InstallableObjectVisitor.visitProductBeans(Unknown Source)
     at com.installshield.product.service.product.PureJavaProductServiceImpl$InstallProduct.install(Unknown Source)
     at com.installshield.product.service.product.PureJavaProductServiceImpl$Installer.execute(Unknown Source)
     at com.installshield.wizard.service.AsynchronousOperation.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source
== Remark to threads ========================
Thread a)
"I found it is very useful to have a clean system" => not applicable to me
Thread b)
deals with removing relics of previous installations => hints considered but error still appears
Thread c)
not applicable to me

Hi all
I've read your entrys.
Saw that the solution is missing.
It can be found in the manuals:
1. Download the "Registry Clean Tool for SAP NetWeaver 2004s ABAP" and use it.
2. Download the latest Version of "SAP NetWeaver 2004s ABAP" and un-rar it.
3. Install the "Microsoft Loopback Adapter" an activate it.
4. Retry to install.
Summary:
So the error 200 was caused for the first time from trying an installation without a Loopback Adapter, and after that from trying to re-install without cleaning the registry.
Now its working fine.
Thomas

ABAP Objects and table processing (with logical databases)

I have a report that is written right now using procedural abap and a logical database. The report is structured follows (high level):
start-of-selection.
get pernr.
perform get_it0001 using wtab.
perform get_it0002 using wtab.
perform get_it0003 using wtab.
append wtab to itab.
end-of-selection.
call function 'reuse_alv_grid_display'
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 i_structure_name = 'itabstructure'
 tables
 t_outtab = itab.
So basically I'm going through a bunch of personnel numbers, getting a few infotypes and outputting to ALV. I don't see where ABAP Objects is going to help me for this particular program.
Can somebody show me where OO ABAP would make this easier? Does it even make sense to use OO when you're processing with a logical database? (Not just PNP, but any logical database in general).
Thanks in advance.

Hello Lee
I assume that the routines GET_ITnnnn are written by yourself. For reading infotypes ABAP Objects provides us with same very helpful classes as shown below:
* define data
DATA:
 gif_employee type ref to if_pt_employee,
 go_employee type ref to cl_pt_employee,
 gt_infotypes TYPE tim_tmw_itlist_tab,
 go_control TYPE REF TO if_pt_td_control,
 go_data TYPE REF TO if_pt_td_base,
 go_pnnnn TYPE REF TO if_pt_td_itnnnn,
 gt_p0001 TYPE TIM_P0001_TAB,
 gt_p0002 TYPE TIM_P0002_TAB,
 gt_p0003 TYPE TIM_P0003_TAB.
start-of-selection.
GET pernr.
* Create employee instance
gif_employee = cl_pt_employee=>get_employee( pernr ).
go_employee ?= gif_employee.
* Get master infotypes (0001, 0002)
CALL METHOD go_employee->get_master_data
 EXPORTING
 im_begda = id_fromdate
 im_endda = id_todate
 IMPORTING
* EX_I0000 =
 EX_I0001 = gt_p0001
 EX_I0002 = gt_p0002
* EX_I0007 =
* EX_I0008 =
* Append all other required infotypes to itab
APPEND '0003' TO gt_infotypes.
CALL METHOD go_employee->get_infotypes
 EXPORTING
 i_itlist = gt_infotypes
 i_fromdate = id_fromdate " start date
 i_todate = id_todate " end date
* I_FILTER =
 i_noauthcheck = 'X'
 IMPORTING
 e_result = gt_infty_request
 e_retcd = gd_retcd.
* Please see documentation of parameter e_retcd...
LOOP AT gt_infty_request INTO go_control.
 go_data = go_control->data. " get data object
* Casting
 TRY.
 go_pnnnn ?= go_data.
 CATCH cx_sy_move_cast_error.
 CONTINUE.
 ENDTRY.
* Convert infotype (semi-transparent -> transparent)
 CALL METHOD cl_hr_pnnnn_type_cast=>prelp_to_pnnnn
 EXPORTING
 prelp = lo_pnnnn->prelp
 IMPORTING
 pnnnn = gs_p0003.
 APPEND gs_p0027 TO gt_p0003.
ENDLOOP.
The class CL_PT_EMPLOYEE provides us already with very easy access to so-called master infotypes (000, 0001, 0002, 0007 and 0008). All other infotypes can be read using method GET_INFOTYPES.
Using these classes we have a very convenient and standardized way of accessing all kinds of infotypes.
Regards
Uwe

Abap objects and selection screen

Hello everybody,
I am interested in your ways of implementing selection-screens in the style of ABAP Objects.
In earlier times (when I used to implement ABAP objects in a procedural way) I just put the selection-screen commands in an include or a form routine of my ABAP report. So it was possible to run the report in background.
Now I read something about selection-screens/dynpros and "separation of concerns" in the book "ABAP Objects" written by Keller. He advises using function groups to encapsulate presentation from logical matters. (Selection-screen commands are in an automatically generated include now). I implemented this way. (ABAP report with a local class, which has a main method, where function module of the function group is called). It works, but i see no chance to run my report in background now.. but I need to run the report in background.
Does anybody know a solution without deleting function group?
What do you think is the best way of using selection-screen-commands and ABAP Objects, especially regarding running in background?
Thx for your advise in advance.
Kind regards,
Anne

Hi Naimesh,
thx for explanation. I am not sure, if I understood everything in the right way.
Where do you write the code for building the selection-screen? (PARAMETERS, SELECT-OPTIONS etc.)
If you write these commands in a class method, you will get a syntax error ( because it's forbidden per definition of ABAP objects). So, am I right assuming that you put the coding just at the beginning of the ABAP report ? And after START-OF-SELECTION-event you start the processing... ?
Furthermore, I don't really understand why you create an separate class for ALV. I found your "SAP abap help"-blog, where you explained the concept of MVC ((By the way, well done!), but you didn't mention an "ALV class" there..
Mh.. another question - have you ever combined MVC with object services?
At the moment I'm working on a software project where I use object services. I created 2 persistent classes via SE24 and one local class in my ABAP Report.
I don't really see possibility to implement MVC in this project without change very much of coding and class structure...
In my opinion the M (data&business logic) are my existing global classes and my local class is kind of Controller class?!
Thx in advance,
Anne

ABAP Objects Casting error

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