How To Fix REST_CORE_TEXTS029 - Creation of handler class failed (instantiation failed)

SAP Error Message - Details

• Message type: E = Error

• Message class: REST_CORE_TEXTS -

• Message number: 029

• Message text: Creation of handler class failed (instantiation failed)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message REST_CORE_TEXTS029 - Creation of handler class failed (instantiation failed) ?

  The SAP error message REST_CORE_TEXTS029: Creation of handler class failed (instantiation failed) typically occurs in the context of SAP Gateway or OData services when there is an issue with the instantiation of a handler class. This can happen for several reasons, and understanding the cause is crucial for finding a solution.
  Possible Causes
  
  
  Class Not Found: The specified handler class may not exist or is not properly defined in the system.
  
  
  Syntax Errors: There may be syntax errors in the handler class code that prevent it from being instantiated.
  
  
  Authorization Issues: The user executing the OData service may not have the necessary authorizations to access the handler class.
  
  
  Dependency Issues: The handler class may depend on other classes or components that are missing or not activated.
  
  
  Configuration Issues: The OData service may not be properly configured, leading to issues in finding or instantiating the handler class.
  
  
  Transport Issues: If the handler class was recently transported from another system, there may be inconsistencies or missing objects.
  
  
  Solutions
  
  
  Check Class Existence: Verify that the handler class exists in the system. You can do this by using transaction SE80 or SE24 to search for the class.
  
  
  Review Code for Errors: Open the handler class in the ABAP editor and check for any syntax errors or issues in the implementation. Use the syntax check feature to identify problems.
  
  
  Check Authorizations: Ensure that the user has the necessary authorizations to execute the OData service and access the handler class. You can use transaction SU53 to analyze authorization issues.
  
  
  Check Dependencies: Make sure that all dependencies of the handler class are available and activated. This includes any other classes, interfaces, or data elements that the handler class relies on.
  
  
  Review OData Service Configuration: Use transaction /IWFND/MAINT_SERVICE to check the configuration of the OData service. Ensure that the handler class is correctly assigned to the service.
  
  
  Transport Consistency: If the class was transported, check for any missing objects or inconsistencies. You may need to re-transport the class or related objects.
  
  
  Debugging: If the issue persists, consider debugging the OData service to trace where the instantiation fails. This can provide more insight into the underlying problem.
  
  
  Related Information
  
  
  Transaction Codes:
  
  SE80: Object Navigator
  SE24: Class Builder
  /IWFND/MAINT_SERVICE: OData Service Maintenance
  SU53: Authorization Check Analysis
  
  
  
  SAP Notes: Check SAP Notes related to OData services and the specific error message for any known issues or patches.
  
  
  Documentation: Review the SAP Gateway and OData documentation for best practices in developing and configuring services.
  
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it. If the problem persists, consider reaching out to SAP support for further assistance.