How to invoke the AWS lambda function / handler from Java code

Question

I am new to AWS lambda I have created a lambda function with handler

example.Orders::orderHandler

And this is the custom handler, now I wa

Answer 1

Use this LATEST code to invoke a Lambda Function Synchronously:

    final String AWS_ACCESS_KEY_ID = "xx";
    final String AWS_SECRET_ACCESS_KEY = "xx";

    AWSCredentials credentials = new BasicAWSCredentials(AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY);

    // ARN
    String functionName = "XXXX";

    //This will convert object to JSON String
    String inputJSON = new Gson().toJson(userActivity);

    InvokeRequest lmbRequest = new InvokeRequest()
            .withFunctionName(functionName)
            .withPayload(inputJSON);

    lmbRequest.setInvocationType(InvocationType.RequestResponse);

    AWSLambda lambda = AWSLambdaClientBuilder.standard()
            .withRegion(Regions.US_EAST_1)
            .withCredentials(new AWSStaticCredentialsProvider(credentials)).build();

    InvokeResult lmbResult = lambda.invoke(lmbRequest);

    String resultJSON = new String(lmbResult.getPayload().array(), Charset.forName("UTF-8"));

    System.out.println(resultJSON);

Use these dependencies to avoid any errors:

    
        org.codehaus.janino
        janino
        2.6.1
    

    //Required by BeanstalkDeploy.groovy at runtime
    
        org.apache.httpcomponents
        httpclient
        4.5.2
        runtime
    

    
        com.amazonaws
        aws-java-sdk-lambda
        1.11.207