How To Fix SALV_X_API147 - Streaming connection already open: &1

SAP Error Message - Details

• Message type: E = Error

• Message class: SALV_X_API - Messages for ALV API exceptions

• Message number: 147

• Message text: Streaming connection already open: &1

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SALV_X_API147 - Streaming connection already open: &1 ?

  The SAP error message SALV_X_API147 indicates that there is an attempt to open a streaming connection that is already open. This typically occurs in the context of using the SAP ALV (ABAP List Viewer) framework, particularly when working with the SALV (Simple ALV) classes.
  Cause:
  The error is usually caused by one of the following scenarios:
  
  Multiple Calls: The program is trying to open a streaming connection multiple times without closing the previous connection.
  Improper Handling: The code does not properly manage the lifecycle of the streaming connection, leading to attempts to open it again while it is still active.
  Concurrency Issues: If multiple threads or processes are trying to access the same streaming connection simultaneously, it can lead to this error.
  
  Solution:
  To resolve the error, consider the following steps:
  
  
  Check Connection Management:
  
  Ensure that the streaming connection is opened only once. Review the code to confirm that there are no duplicate calls to open the connection.
  If you need to open a new connection, make sure to close the existing one first.
  
  
  
  Proper Lifecycle Management:
  
  Implement proper error handling and cleanup in your code. Use TRY...CATCH blocks to manage exceptions and ensure that connections are closed in the CATCH block if an error occurs.
  
  
  
  Debugging:
  
  Use debugging tools to trace the execution of your program and identify where the connection is being opened multiple times.
  Check for any loops or conditions that might inadvertently lead to multiple connection openings.
  
  
  
  Review Documentation:
  
  Consult the SAP documentation for the SALV classes to understand the correct usage patterns and best practices for managing streaming connections.
  
  
  
  Concurrency Control:
  
  If your application is multi-threaded, ensure that access to the streaming connection is synchronized to prevent concurrent access issues.
  
  
  
  Related Information:
  
  SALV Classes: Familiarize yourself with the SALV classes and their methods, especially those related to streaming and output management.
  SAP Notes: Check SAP Notes for any known issues or patches related to the SALV framework that might address this error.
  Community Forums: Engage with SAP community forums or support channels for additional insights or similar experiences from other developers.
  
  By following these steps, you should be able to identify the root cause of the error and implement a solution to prevent it from occurring in the future.