How To Fix SADL_GW028 - Sticky session request error: Session start not in first changeset

SAP Error Message - Details

• Message type: E = Error

• Message class: SADL_GW -

• Message number: 028

• Message text: Sticky session request error: Session start not in first changeset

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SADL_GW028 - Sticky session request error: Session start not in first changeset ?

  The SAP error message SADL_GW028: Sticky session request error: Session start not in first changeset typically occurs in the context of the SAP Gateway and the SAP Application Development Framework (SADL). This error is related to the handling of sticky sessions in the context of OData services, where the session management is not aligned with the expected sequence of operations.
  Cause:
  The error usually arises due to one of the following reasons:
  
  
  Session Management Issues: The session is not being managed correctly, leading to a mismatch between the expected and actual sequence of changesets. This can happen if multiple requests are sent in a way that disrupts the expected flow of operations.
  
  
  Incorrect OData Request Structure: If the OData request does not conform to the expected structure, such as not starting with the correct changeset, it can lead to this error.
  
  
  Concurrency Issues: If multiple requests are being processed simultaneously, it may lead to conflicts in session handling.
  
  
  Configuration Issues: There may be configuration issues in the SAP Gateway or the backend system that affect how sessions are managed.
  
  
  Solution:
  To resolve the SADL_GW028 error, consider the following steps:
  
  
  Check Request Structure: Ensure that the OData requests are structured correctly. The first changeset should be properly defined, and subsequent requests should follow the expected sequence.
  
  
  Review Session Management: Investigate how sessions are being managed in your application. Ensure that sticky sessions are correctly implemented and that the session state is maintained across requests.
  
  
  Debugging: Use debugging tools to trace the requests and responses. Look for any discrepancies in the changesets and session handling.
  
  
  Concurrency Control: If multiple requests are being sent simultaneously, consider implementing a mechanism to control concurrency. This could involve queuing requests or ensuring that they are processed in a controlled manner.
  
  
  Configuration Review: Check the configuration of the SAP Gateway and the backend system. Ensure that all settings related to session management and OData services are correctly configured.
  
  
  SAP Notes and Documentation: Look for any relevant SAP Notes or documentation that may address this specific error. SAP frequently updates its knowledge base with solutions to common issues.
  
  
  Testing: After making changes, thoroughly test the application to ensure that the error does not recur.
  
  
  Related Information:
  
  SAP Gateway: Understand how the SAP Gateway handles OData services and session management.
  OData Protocol: Familiarize yourself with the OData protocol and how changesets are structured.
  SAP Community: Engage with the SAP Community forums to see if others have encountered similar issues and what solutions they have found.
  SAP Support: If the issue persists, consider reaching out to SAP Support for assistance.
  
  By following these steps, you should be able to diagnose and resolve the SADL_GW028 error effectively.