To instantiate the tracer, call the AppDynamics.getTracer(context) method. Place the method at the beginning of your function's entry point method.

The code snippet demonstrates how to instantiate the tracer:

@Override
    public void handleRequest(InputStream input, OutputStream output, Context context) throws IOException {
 
		//Instantiate the tracer.
  		Tracer tracer = AppDynamics.getTracer(context);
 
		//Your AWS Lambda function code begins here.
		int letter = 0;
        while((letter = input.read()) >= 0) {
            output.write(Character.toUpperCase(letter));
		}
    }