How To Fix SVMCRT_SERVICE_FRM031 - The constructor of the implementation class "&1" must be "public"

SAP Error Message - Details

• Message type: E = Error

• Message class: SVMCRT_SERVICE_FRM - VMC Service Framework

• Message number: 031

• Message text: The constructor of the implementation class "&1" must be "public"

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message SVMCRT_SERVICE_FRM031 - The constructor of the implementation class "&1" must be "public" ?

  The SAP error message SVMCRT_SERVICE_FRM031 indicates that there is an issue with the visibility of the constructor in the implementation class of a service. Specifically, the error states that the constructor of the implementation class must be declared as public. This is a common requirement in many programming languages, including ABAP, when creating service implementations.
  Cause:
  The error occurs when:
  
  The constructor of the implementation class (the class that implements a service) is not declared as public. In ABAP, if a constructor is not public, it cannot be accessed from outside the class, which is necessary for the service framework to instantiate the class.
  
  Solution:
  To resolve this error, you need to ensure that the constructor of the implementation class is declared as public. Here’s how you can do that:
  
  
  Open the Implementation Class: Go to the ABAP development environment (SE80 or SE24) and open the implementation class that is causing the error.
  
  
  Modify the Constructor: Locate the constructor method in the class definition. It should look something like this:
  CLASS my_class DEFINITION.
    PUBLIC SECTION.
      METHODS constructor.
    PRIVATE SECTION.
      " Other methods and attributes
  ENDCLASS.
  
  CLASS my_class IMPLEMENTATION.
    METHOD constructor.
      " Constructor logic
    ENDMETHOD.
  ENDCLASS.
  
  
  Change the Visibility: Ensure that the constructor is declared in the PUBLIC SECTION of the class definition. If it is currently in the PRIVATE SECTION, move it to the PUBLIC SECTION.
  
  
  Activate the Changes: After making the changes, activate the class.
  
  
  Test the Service: After activation, test the service again to ensure that the error is resolved.
  
  
  Related Information:
  
  ABAP Class Visibility: In ABAP, class members (methods and attributes) can have different visibility levels: PUBLIC, PROTECTED, and PRIVATE. The PUBLIC section allows access from outside the class, which is necessary for service classes.
  Service Implementation: When implementing services in SAP, it is crucial to follow the framework's requirements, including proper visibility of constructors and methods.
  Error Handling: If you encounter similar errors, always check the visibility of methods and constructors in your classes, as this is a common source of issues in ABAP development.
  
  By ensuring that the constructor is public, you should be able to resolve the SVMCRT_SERVICE_FRM031 error and successfully implement your service.