How To Fix SMT157 - &1 is an interface, not a class

SAP Error Message - Details

• Message type: E = Error

• Message class: SMT -

• Message number: 157

• Message text: &1 is an interface, not a class

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SMT157 - &1 is an interface, not a class ?

  The SAP error message SMT157 indicates that there is an attempt to use an interface as if it were a class. This typically occurs in ABAP programming when you are trying to instantiate an interface or call a method that is not defined in a class context.
  Cause:
  
  Incorrect Instantiation: You may be trying to create an instance of an interface using the CREATE OBJECT statement, which is only valid for classes.
  Method Call on Interface: You might be trying to call a method that is defined in an interface without implementing it in a class.
  Misunderstanding of Object-Oriented Concepts: There may be a misunderstanding of how interfaces and classes work in ABAP.
  
  Solution:
  
  
  Check Instantiation: Ensure that you are not trying to instantiate an interface. Instead, you should implement the interface in a class and then create an instance of that class.
  INTERFACE if_example.
    METHODS method_example.
  ENDINTERFACE.
  
  CLASS cl_example DEFINITION.
    INTERFACES if_example.
  ENDCLASS.
  
  CLASS cl_example IMPLEMENTATION.
    METHOD if_example~method_example.
      " Implementation code
    ENDMETHOD.
  ENDCLASS.
  
  DATA: lo_example TYPE REF TO cl_example.
  CREATE OBJECT lo_example.
  lo_example->if_example~method_example( ).
  
  
  Implement the Interface: If you need to use methods defined in an interface, ensure that you have a class that implements that interface and use that class to call the methods.
  
  
  Review Code: Go through your code to identify where the error is occurring. Look for any CREATE OBJECT statements or method calls that involve interfaces.
  
  
  Related Information:
  
  ABAP Object-Oriented Programming: Familiarize yourself with the concepts of classes and interfaces in ABAP. Understanding the distinction between the two is crucial for effective programming.
  SAP Documentation: Refer to the official SAP documentation for more details on object-oriented programming in ABAP, including how to properly use interfaces and classes.
  Debugging: Use the ABAP debugger to step through your code and identify where the error is being triggered. This can help you understand the context of the error better.
  
  By following these steps, you should be able to resolve the SMT157 error and ensure that your ABAP code adheres to the correct object-oriented principles.