This extends Install Kubernetes (i.e. minikube) on Mac.
Step 1: Start the Docker.app on Mac, and then start the minikube cluster from a terminal.
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~]$ minikube start |
Step 2: Create a pod.yaml manifest file to create a new pod that runs nginx image.
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This extends 04: Microservices Architecture design patterns & considerations interview Q&As – Part 3. 4. Observability patterns Microservices require various cross-cutting concerns such as metrics, reporting exceptions to an exception tracker, logging, distributed tracing, health checks, externalised configuration, and security. Additionally, a service may need to handle service discovery and...
A software application is built by coupling various classes, modules, and components. Without coupling, you can’t build a software system. But, the software applications are always subject to changes and enhancements. So, you need to build your applications such a way that they can not only adapt to growing requirements,...
Q1. What’s wrong with Servlets? What is a JSP? What is it used for? What do you know about model 0 (aka MVC0), model 1 (aka MVC1) and model 2 (aka MVC2) patterns? In “model 2” architecture, if you set a request attribute in your JSP, … Read more ›...
“Metrics Core” is a very handy framework to gather insights & tune performance of high-throughput and low-latency services. Here is a very simple core Java multi-threaded application that gathers metrics with this library. Step 1: Create a maven project Press enter for all prompts to use the default values. …...
#1. Adding the @Named annotation to the interface instead of the implementation Adding the @Named, @Component, @Repository, etc annotation on the interface as opposed to the implementation class. The code below can throw “NoSuchBeanDefinitionException”
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package com.mytutorial; @Named public interface SimpleDao { abstract String getNameById(int id); } |
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package com.mytutorial; import javax.inject.Named; public class SimpleDaoImpl implements SimpleDao { public String getNameById(int id) { return "test" } } |
FIX: The @Named annotation is now in the implementation class. … Read more ›...
Q01. What is a Helm chart in Kubernetes? A01. A Helm chart is a package manager for Kubernetes. A chart is a collection of files that describe a related set of Kubernetes resources. It contains all the necessary resources to deploy an application to a Kubernetes cluster. … Read more...
This extends 05: Microservices Architecture design patterns & considerations interview Q&As – Part 4. 5. Deployment patterns Microservices enable your development team to roll out software solutions more quickly and better react to customer needs. Microservices deployment patterns or considerations enable easy deployments and allow you to modify microservices. …...
Design principles interview questions & answers for Java developers so that you can expand your OOP skills to design robust Java apps Q25. What are the SOLID design principles? A25. SOLID is an abbreviation for 5 design principles. SRP (Single Responsibility Principle) If you have a class with calculation logic,...
Never just trust that adding @Transactional annotation is going to create a transactional boundary for your service layer. EventRestController –> EventMergeProcesorImpl –> EventControlDAOImpl The @Transactional annotations added to “public” methods of the EventMergeProcesorImpl. Spring creates a proxy around the “EventMergeProcesorImpl”. … Read more ›...
Q01. What is a kubectl in Kubernetes? A01. Kubectl is a command line tool used to run commands against Kubernetes clusters. kubectl is what you will be using often to issue commands against a kubenetes cluster. You can create pods, deployments, … Read more ›...
Q1. Explain “pull” vs “push” paradigms (aka imperative/interactive vs reactive) with respect to processing data in programming? A1. Interactive/imperative Programming (Pull): is all about asking for something and getting it in return. … Read more ›...
The scenario based questions are very popular with the job interviewers, and some scenario based questions are related to decoupling and asynchronous (aka non-blocking) processing in Java with message queues/topics, database tables where one process inserts data and another process consumes the inserted data, and Future objects in Java multi-threading....
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