invokeLambda

    AWSLambdaAsyncClient lambdaClient = new AWSLambdaAsyncClient();
		lambdaClient.withRegion(Region.getRegion(Regions.US_WEST_2));
		InvokeRequest invokeRequest = new InvokeRequest();
		invokeRequest.setInvocationType("RequestResponse"); // ENUM RequestResponse or Event
		invokeRequest.withFunctionName("FUNCTION NAME").withPayload(payload);
		InvokeResult invoke = lambdaClient.invoke(invokeRequest);
		try {
			// PRINT THE RESPONSE
			String val = new String(invoke.getPayload().array(), "UTF-8");
			System.out.println("Response==> " + val);
		} catch (Exception e) {
			System.out.println("error");
		}