code: public static String getThreadId() {
          // return Integer.toHexString(Thread.currentThread().hashCode());
  
          if (useJULThreadId) {
              // create a dummy LogRecord
              LogRecord logRecord = new LogRecord(Level.FINE, "x");
  
              return getThreadId(logRecord);
          } else {
              return threadIdToString(getIntThreadId());
          }
      }
docs: Returns the thread identifier for the calling thread used in log files.
  This thread Id is used in WAS log and trace files. Depending on the value
  assigned to com.ibm.websphere.logging.useJULThreadID system property it
  will be an eight character hexadecimal string representation of either
  LogRecord.getThreadId() or Thread.getId() value.
  
  @return String the thread id