topic Re: error creating a object in Application Development and Automation Discussions

error creating a object

Former Member — Wed, 09 Apr 2008 12:01:28 GMT

hi all,

We update our SAP from 4.7 to ECC6.0 and now, in a report program it's giving the next error:

- You cannot create an instance of the class "CL_SWF_REP_MANAGER" outside the class...

at 4.7 it's work fine.

here it's the code:

CLASS cl_swf_rdg_dispatcher DEFINITION LOAD.

DATA: int TYPE REF TO if_swf_rep_workitem_selection.

{ ... }

IF int IS INITIAL.

CREATE OBJECT int TYPE cl_swf_rep_manager.

ENDIF.

{ ... }

Thanks for ur help.

Re: error creating a object

Former Member — Wed, 09 Apr 2008 12:21:51 GMT

Hello,

This occurs because now the instantiation method for the class is private (folder Properties ), that is, the only way to instantiate the class is using a friend/agent to instantiate the class. The agents are declared as friends of the class, go to the folder Friends and you will find the class CL_SWF_REP_ITEM2OBJECT. Now you need to change the reference variable to refer to this friend class/interface with instantion method public and find out in this one how to instantiate the class.

Regards,

Re: error creating a object

marcelo_ramos1 — Wed, 09 Apr 2008 14:22:38 GMT

Hi Alan,

We usually define the class as PROTECTED or PRIVATE to avoid direct access and Final to avoid INHERITING. Thus you must use the method GET_INSTANCE to get a instance of its class.

Use this way:


DATA o_ref_class  TYPE REF TO cl_swf_rep_manager.
DATA o_ref_interf TYPE REF TO if_swf_rep_workitem_selection.

START-OF-SELECTION.

*// Instantiate your object using Norrowing cast
  o_ref_class ?= cl_swf_rep_manager=>get_instance( ).
*// Instantiate your object using Widening cast
  o_ref_interf = cl_swf_rep_manager=>get_instance( ).

Don't forget to close this Thread when your question be answered !

Best Regards.

Marcelo Ramos

Re: error creating a object

matt — Wed, 09 Apr 2008 14:41:18 GMT

You'll often see methods such as GET_INSTANCE referred to as factory methods.

matt