As I mentioned earlier, I use LocalStack to emulate AWS services during development phase. It works more or less well. Recently I faced a problem with LocalStack OpenSearch instance. I created one OpenSearch cluster using LocalStack. My LocalStack is installed via docker-compose file & it runs in a container. Now I have developed a Java … Read more
Most of us have encountered below error while executing Python script: The problem is also pretty well known. Python prefers spaces over tabs. And your code editor might be configured to add tab for indentation. If you modify a Python script, then you might get a mix of space & tab in the script. Python … Read more
First things first. Here we won’t be discussing mocking of Java enum or final class using PowerMock framework. That is already discussed in tons of places & one of the main reason why people tend to use PowerMock.Here we will be discussing mocking of enum or final classes with Mockito framework only. The feature has … Read more
Dealing with Recurrence Rule can be pain. I have seen people facing problem in understanding & parsing Rrule though we have a detailed RFC around it. I guess difficulty comes from the fact that there are so many different recurrence patterns to deal with.Here we would be exploring a few libraries to find out last … Read more
Writing Junit test cases for a multithreaded program can be tricky. For unit test, you need a predictable result to validate against. Let’s say that ExecutorService is running two tasks in parallel in two different threads. You want to put the results back in a list. Then how would you know which result gets stored … Read more
I was exploring GKE or Google Kubernetes Engine recently. Google Cloud has pretty good UI interface where you can deploy workloads & services without having to define your own YAML file. You can completely skip kubectl command line if you are starting as a Kubernetes beginner. You can just follow the UI steps. UI is … Read more
Let’s take an example & understand the problem first. We have one VehicleService interface: We have two different implementations of VehicleService: We have a RestController: So you got the problem. I need to use either TwoWheelerService or FourWheelerService based on the “type” query parameter in the Controller method. We can do that easily. We can … Read more
I was exploring DynamoDB query command using AWS cli. What made me confused is the page-size option that comes with AWS cli command. General perception is that when we add page-size to a query command, it will return that many items in the result set.So when I ran command similar to below, my expectation was … Read more
I was playing around with Google Kubernetes Engine few days back. I wanted to try out GKE autopilot cluster setup. Autopilot mode is basically a fully managed kind of a setup. With standard mode, we get fully managed control plane. But we need to plan for the capacity of data plane nodes & create, manage … Read more
Recently I moved this WordPress blog to Google Cloud. I used WordPress by Bitnami one click installation to setup a new WordPress blog. And then I migrated existing blog data to the new one. I just had to change DNS A record to point to the new IP address. And WordPress migration happened without any … Read more