How To Fix UPGBA020 - Duplicate instantiation of the logger class (LogID:&1, PID:&2, RUNID:&3)

SAP Error Message - Details

• Message type: E = Error

• Message class: UPGBA - Upgrade compatible logging framework messages

• Message number: 020

• Message text: Duplicate instantiation of the logger class (LogID:&1, PID:&2, RUNID:&3)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message UPGBA020 - Duplicate instantiation of the logger class (LogID:&1, PID:&2, RUNID:&3) ?

  The SAP error message UPGBA020 indicates that there is a duplicate instantiation of the logger class in your SAP system. This typically occurs when the logging mechanism is trying to create multiple instances of the same logger, which can lead to conflicts and unexpected behavior.
  Cause:
  
  Multiple Logger Instances: The most common cause of this error is that the logger class is being instantiated multiple times in the same context or session. This can happen due to incorrect configuration or coding practices.
  Concurrency Issues: If multiple processes or threads are trying to instantiate the logger simultaneously, it can lead to this error.
  Configuration Errors: Misconfiguration in the logging framework or incorrect settings in the application can also lead to duplicate logger instances.
  
  Solution:
  
  
  Check Logger Instantiation: Review the code where the logger is instantiated. Ensure that the logger is instantiated only once, preferably as a singleton. This can be done by using a static method or variable to hold the logger instance.
  Example in Java:
  public class Logger {
      private static Logger instance;
  
      private Logger() {
          // private constructor
      }
  
      public static Logger getInstance() {
          if (instance == null) {
              instance = new Logger();
          }
          return instance;
      }
  }
  
  
  Review Configuration: Check the logging configuration files (like log4j.properties or similar) to ensure that there are no conflicting settings that could lead to multiple logger instances being created.
  
  
  Thread Safety: If your application is multi-threaded, ensure that the logger instantiation is thread-safe. You can use synchronization mechanisms to prevent multiple threads from creating logger instances simultaneously.
  
  
  Update SAP Notes: Check for any relevant SAP Notes or patches that might address this issue. Sometimes, SAP releases updates that fix known bugs related to logging.
  
  
  Consult Documentation: Review the documentation for the logging framework you are using to ensure that you are following best practices for instantiation and configuration.
  
  
  Related Information:
  
  Logging Framework: Understand the logging framework being used (e.g., SLF4J, Log4j, etc.) and its specific requirements for instantiation.
  SAP Community: Engage with the SAP community forums or support channels for additional insights or similar cases.
  Performance Monitoring: Monitor the performance of your application to ensure that logging is not causing bottlenecks or issues due to excessive instantiation.
  
  By addressing the above points, you should be able to resolve the UPGBA020 error and prevent it from occurring in the future.