Glossary

JPA

JPA

Jakarta Persistence API

A JVM object-persistence specification; Hibernate is one implementation. A persistence context tracks entities, but flush timing, transactions and SQL still matter.

JRE

JRE

Java Runtime Environment

Java execution environment. Our exercises/build need a full JDK with javac rather than only a runtime.

JShell

An interactive Java console for small expressions and experiments. Console results help explain a mechanism but do not replace application tests.

JSON

JSON

JavaScript Object Notation

A text data format with objects, arrays, numbers, strings, booleans and null. Valid JSON syntax does not establish schema or business-rule correctness.

JSON Web Key Set

JWKS

JSON Web Key Set

A collection of JSON Web Keys, often published by an issuer for JWT signature verification. Validate the trusted issuer, algorithm and rotation; downloading a key alone does not authenticate a user.

JUnit

A JVM test framework with annotations and assertions. It checks executed cases; a reference test does not complete a learner attempt.

Just-in-Time

JIT

Just-in-Time

Compilation during program execution, often based on runtime profiling. Warmup and optimization affect benchmarks.

JVM

JVM

Java Virtual Machine

A virtual machine executing Java and Kotlin bytecode, among others. Sharing a runtime does not make the languages’ semantics identical.

JWT

JWT

JSON Web Token

A token format containing claims such as issuer, audience and expiry. Signature checking is only part of validation; a typical signed JWT does not hide its contents.

K2

A product name or identifier; no acronym expansion is invented.

The name of a Kotlin compiler generation. Verify compatibility on the pinned version and plugins, not merely the compiler name.

Kafka

An event-streaming platform with partitions and consumer offsets. Ordering has a defined scope, and external database effects still need retry handling.

kind — local Kubernetes

kind

Kubernetes in Docker

A tool running a local Kubernetes cluster with nodes in containers. Useful for labs and tests. It is neither a Docker engine nor a production cluster; a project defines compatible node images and tool versions.

KISS

KISS

Keep It Simple, Stupid

Choose a solution whose input, rule and result are easy to trace. Fewer characters do not justify unreadability or missing error handling.

Kotlin

A statically typed language used here for JVM comparison. Null safety, read-only collections and coroutines have limits; they do not automatically ensure correct Java integration.

Kotlin platform type

A Java-library type whose nullability is not fully known to Kotlin. Access can fail for null; validate at the boundary and use an explicit type. !! alone is not domain validation.

kubelet

Node agent supervising assigned Pods and reporting their state. It does not replace the Deployment controller or cluster scheduler.

Kubernetes

k8s

Kubernetes

A platform running containerized applications and reconciling their state. Controllers work toward declared desired state; a working cluster does not automatically mean a correct application.

Kubernetes controller

A loop observing state, comparing it with a declaration and attempting to reduce the difference. The whole process is not atomic; failures and further reconciliation are part of the model.

Kubernetes Deployment

A controller declaratively managing application Pod replicas and updates. A successful rollout does not yet prove business correctness.

Kubernetes operator

A controller encoding operational knowledge, often for a custom resource. Its permissions and behavior belong in failure and recovery design.

Kubernetes Pod

Kubernetes’ basic execution unit, containing one or more collaborating containers. Pods can be replaced; their names should not be durable business-data identities.

Kubernetes Service

A stable way to access a selected set of endpoints, usually Pods. A Service’s existence does not mean the application is ready or externally exposed.

Kustomize

Composes and modifies manifests through bases and overlays. Describes environment differences without erasing semantic differences between providers.

Lambda

A compact function expression passed as a value, such as a list transformation. It may capture surrounding state; concise syntax does not imply absence of side effects.

Larastan

PHP/Laravel static analysis built on PHPStan. It detects selected typing and usage problems; tests still verify runtime effects.

Laravel

A PHP framework offering web-application conventions and tools. Its container, routing and Eloquent help development, but domain rules and transaction boundaries still require design.

Laravel AI SDK

SDK

Software Development Kit

AI

Artificial Intelligence

A Laravel library for AI features inside an application. Unlike Boost it implements product behavior and requires data boundaries, cost/failure controls and quality tests.

Laravel Boost

Laravel agent-assisted development support: context, guidelines, documentation and MCP tools. It is not application AI functionality. Agent permissions remain a separate decision.

Laravel Octane

Laravel request serving that keeps the application alive in workers. It reduces repeated bootstrap but requires control of customer state, memory and dependency lifecycle.

Laravel Pint

A PHP style formatter for Laravel projects. Consistent diffs aid review but do not prove rule correctness.