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ABAPCREATE_OBJECT - CREATE OBJECT

ABAPCREATE_OBJECT - CREATE OBJECT

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CREATE OBJECT

Short Reference



Defining a Class Implicitly

1. CREATE OBJECT oref $[area_handle$] $[ parameter_list$].

Defining a Class Explicitly

2. CREATE OBJECT oref $[area_handle$]
                     TYPE ${ class $[parameter_list$] $}
                        $| ${ (name) $[ parameter_list$|parameter_tables$] $}.


Effect

The statement CREATE OBJECT creates an instance of a class or an object and assigns the reference to the object of the reference variable oref. The instance constructor of the class is called directly after the object is created.

By default, the object is created in the internal session (or heap) of the current program and is preserved there for as long as it is required. If no more heap references point to the object, the following applies:

  • No more object references point to the object.
  • No data reference and no field symbol points to an instance attribute or to a part of an instance attribute,

Also, if no more methods of the object are registered as event handlers, it is deleted by the Garbage Collector. The addition area_handle can be used to create the object as a shared object.

The reference variable oref must be declared as an object reference variable. Instance components of an object created using CREATE OBJECT can only be accessed using object reference variables (see Data Objects in Operand Positions).

The addition TYPE can be used to specify the class of the created object. The static type of the object reference variables must be more general than or identical to the class of the created object, in accordance with the rules for Assignments Between Object Reference Variables.

Instances of a class can be created only where it is allowed by the addition CREATE of the statement CLASS DEFINITION. It can be a local class of the same ABAP program or a global class of the class library allowed by the package check.

The additions parameter_list and parameter_tables must be used to fill the non-optional input parameters of the first explicitly implemented instance constructor that is on the path of the inheritance tree between the instantiated class and the root class object. These additions can also be used to assign return values to the non-class-based exceptions of the instance constructor.

If a catchable exception is raised when the object is created in the runtime framework, the object is not created and the object reference variable oref is initialized. If a catchable exception is raised when the object is created in the instance constructor of the class, the created object is deleted and the object reference variable oref is initialized.

Return Value

If the CREATE OBJECT statement is executed successfully, sy-subrc is set to 0. Values other than 0 can occur when specifying EXCEPTIONS in parameter_spec when non-class-based exceptions of the instance constructor are handled.

Notes

  • If the reference variable oref specified after CREATE OBJECT is passed simultaneously to the instance constructor, it already points to the new object when it is executed. To pass a reference to an existing object to the instance constructor, a different reference variable must be used.
  • The statement CREATE OBJECT creates a heap reference. All references that point to the object or its parts are also heap references and keep the object alive. The same applies to field symbols that point to instance attributes or to their parts.
  • The return code sy-subrc is set to 0 if the statement is successful because the instance constructor is called. sy-subrc is set each time a method is called.

Exceptions

Catchable Exceptions

CX_SY_CREATE_OBJECT_ERROR

  • Cause: An attempt was made to instantiate an abstract class.
    Runtime Error: CREATE_OBJECT_CLASS_ABSTRACT
  • Cause: The class specified in the addition TYPE does not exist.
    Runtime Error: CREATE_OBJECT_CLASS_NOT_FOUND
  • Cause: The class specified dynamically in TYPE does not match the type of the reference variable.
    Runtime Error: MOVE_OREF_NOT_CONVERTIBLE
  • Cause: An attempt was made to instantiate a private class externally.
    Runtime Error: CREATE_OBJECT_CREATE_PRIVATE
  • Cause: An attempt was made to instantiate a protected class externally.
    Runtime Error: CREATE_OBJECT_CREATE_PROTECTED

Non-Catchable Exceptions

  • Cause: A reference must be specified as the target variable.
    Runtime Error: CREATE_OBJECT_NO_REFTYPE:






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