Jakarta Persistence API is formerly known as Java Persistence API. JPA is a specification that facilitates object-relational mapping to manage relational data in Java applications. Most of the ORM tool like Hibernate, IBatis, Toplink are implemented JPA standards. It provides a support to work directly with object instead of using…

What is Sidecar? A sidecar is a separate container that runs alongside an application container in a Kubernetes pod. Sidecar is responsible for networking features such as inter communication, monitoring, security, timeouts, retries, circuit breaking communication protocols such as HTTP, GRPC. Sidecars are typically managed by some type of control plane.

Tapir Declarative, type-safe web endpoints library. With tapir, you can describe HTTP API endpoints as immutable Scala values. Each endpoint can contain a number of input and output parameters. Why tapir? type-safety: compile-time guarantees, develop-time completions, read-time information declarative: separate the shape of the endpoint (the “what”), from the server logic (the “how”) …

What is Istio Istio is an open source service mesh that layers transparently onto existing distributed applications. Istio is the path to load balancing, service-to-service authentication, and monitoring — with few or no service code changes. Deployment and Traffic shifting Traffic shifting makes it possible to gradually migrate traffic from one version of a micro service to…

Map<String, String> map = new HashMap<>(); When we create a HashMap, it is stored in JVM heap memory. /** * The default initial capacity - MUST be a power of two. */ static final int DEFAULT_INITIAL_CAPACITY = 1 << 4; // aka 16 When initialisation, it is created 16 buckets…

Here we are using zio-kafka library to build the kafka producer and consumer. "dev.zio" %% "zio-kafka" % "2.0.1" Serialize and Deserialize Data In ZIO, we are using Serdes to serialize our data to a byte array and deserialize byte arrays to our data types. ZIO Serde is supporting below mentioned primitive types.

What is Let’s Encrypt? Let’s Encrypt is a non-profit certificate authority run by Internet Security Research Group. It provides X.509 certificates for Transport Layer Security encryption at no charge. The certificate is valid for 90 days. Install Apache and server maintain Execute the following command to install Apache2: sudo apt install apache2 Start and stop server sudo systemctl stop…

Overflow and underflow happen when we assign a value that is out of range of the declared data type of the variable. If the (absolute) value is too big, we call it overflow, if the value is too small, we call it underflow.

minikube quickly setup a local Kubernetes cluster on our personal computer. So you can try out Kubernetes very easily. 1. Install minikube You need docker or a virtual machine environment. requirements 2 CPUs or more 2GB of free memory 20GB of free disk space docker or virtual machine manager(VirtualBox, VMWare) a. First download the latest minikube curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube_latest_amd64.deb