This is like a reminder to myself but assumed others might also be interested in it. When designing REST API, remember that every character in the URI is important and constitutes unique resource. Hence: http://your-server.com/api/cars is different than http://your-server.com/api/cars/ AWS API Gateway is not different in this case, so pay extra attention as you define e.g. triggers for your lambdas in SAM file: ReadCars: Type: AWS::Serverless::Function Properties: (...) Events: GetEvent: Type: Api Properties: Path: /cars Method: get Mind this /cars value for Path....

If you’d like to use CORS in your AWS API Gateway, it’s pretty easy to configure in the Console. You just select the resource (or the root if you’d like to enable it for all resources) and select Actions -> Enable CORS, like this: If you’re using SAM, it might be much more useful for you to define it within the SAM template file directly, as described in the documentation....

I’m in the process of getting familiar with AWS and Serverless architecture and thought I’ll share some basics with you. I have created a sample project using AWS CodeStar that utilizes Python and AWS Lambda. When analyzing the buildpsec.yml and template.yml I found that in template.yml you don’t have any CodeUri location that would point to the artifact used by Lambda. At the same time in buildspec.yml you can find following command:...

The biggest struggle I had in my mind when thinking about serverless and AWS itself was - how the hell to properly test it and create development environment? There is no way to hit production without properly and in easy way testing all parts of AWS services. I could identify 2 biggest players in this area: “delivered by AWS directly - SAM Local (abbreviation of Serverless Application Module) with its local option,” “localstack with its large set of docker images for AWS services....

Want to use Payara / Glassfish with JAX-RS and Jackson to serialize/deserialize objects to/from JSON? Pay extra attention as it might bite you as it had bit me. I was more than sure that Payara is using Jackson as JSON processor (I’ve checked pom.xml dependencies of Payara and found that Jackson 2.5.1 is defined there). Therefore, I started using all those nice @JsonProperty or @JsonAutoDetect annotations while scratching my head why is Payara ignoring them but still did “some” serialization using some defaults, i....

Some time ago I started to play with AngularJS to create a simple side-project app. During this work I realized that I don’t like the differences between how the application works depending on the environment where I deploy it (localhost - faster and Docker on VPS - slower). The UX was quite poor for slower network connection and I decided to do something about that. The user experience was increased by applying some simple rules like:...

JBoss Keycloak is available as a Docker image. It’s all fun and games until you’ll try to run it behind SSL reverse proxy like I do for all my services. Despite settings all required HTTP headers on the proxy side (Nginx in my case) like: proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-Proto $scheme; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; it fails to pass all the requests to the Docker Keycloak image (running on Wildfly server)....

Obeying to the TDD (Test Driven Development) saved me a lot of time so I decided to write about it. It nicely shows the real-life advantage you can get from following TDD. Now, to keep it short - few days ago I was writing some business logic that did some audit recording changes. For the sake of brevity imagine it was something between those lines: public void recordAudits(Data data) { if (data....

When you have some non-trivial boolean statement used in if like: private void evict(Data data) { // ... if (data.getDate() >= MATURITY_DATE && data.type == DataType.UNDEF) { // do the eviction } } To make it easier to read and maintain, it’s a good idea to extract it to a local variable or method: private void evict(Data data) { // ... boolean isEligibleForEviction = data.getDate() >= MATURITY_DATE && data.type == DataType....

I’ve finished the migration process of my blog. I’ve decided to get rid of the Wordpress, as I was not using even 20% of its features and, moreover, it felt a bit too heavy for my needs. I’ve decided to give Jekyll a try and therefore moved to the static website generation. It should save a lot of bandwidth and time for each post to load. It is also more simple (not to say ascetic) when it comes to the graphics and colors....