docs: public static void premain(String arg, Instrumentation inst) throws Exception {
          BootstrapAgent.arg = arg;
          BootstrapAgent.instrumentation = inst;
          setSystemProperties();
  
          if (arg == null || arg.length() == 0) {
              return;
          }
  
          // Find the relative location of the target agent jar and save its
          // arguments
          int separator = arg.indexOf('=');
          String targetAgent = separator < 0 ? arg : arg.substring(0, separator);
          String targetAgentArgs = separator < 0 ? "" : arg.substring(separator + 1);
  
          try {
              loadAgentJar(targetAgent, targetAgentArgs);
          } catch (FileNotFoundException e) {
              // if the code cannot find the specified jar file, do nothing. This is the original behavior.
          }
      }