Here we will see how to write OpenSearch multi-match query using Java SDK. OpenSearch multi-match query is supported for String type fields only. We will write code in Java to implement that. Also, we will write some Java code which can be used to emulate multi-match query for non-String data type fields like Integer, Long, … Read more
Here we will learn how to create OpenSearch client using Java SDK. We will see how to connect to an OpenSearch cluster from a Java application for both AWS & non-AWS environments. OpenSearchClient for non-AWS environment: For a Gradle project, we need to add below dependencies in build.gradle file. For maven project, we would need … Read more
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