Spring Framework is a Java platform that provides comprehensive infrastructure support for developing Java applications. … Spring enables you to build applications from “plain old Java objects” (POJOs) and to apply enterprise services non-invasively to POJOs.

Spring IO is a cohesive, versioned platform for building modern applications. It is a modular, enterprise-grade distribution that delivers a curated set of dependencies while keeping developers in full control of deploying only the parts they need. Spring IO offers a vast array of tools to get your project up and running.

Spring Boot-Takes an opinionated view of building Spring applications and gets you up and running as quickly as possible.

Spring Framework-Provides core support for dependency injection, transaction management, web apps, data access, messaging, and more.

Spring Data-Spring Data’s mission is to provide a familiar and consistent, Spring-based programming model for data access while still retaining the special traits of the underlying data store. It makes it easy to use data access technologies, relational and non-relational databases, map-reduce frameworks, and cloud-based data services. This is an umbrella project which contains many subprojects that are specific to a given database. The projects are developed by working together with many of the companies and developers that are behind these exciting technologies.

Spring Cloud-provides tools for developers to quickly build some of the common patterns in distributed systems (e.g. configuration management, service discovery, circuit breakers, intelligent routing, micro-proxy, control bus, one-time tokens, global locks, leadership election, distributed sessions, cluster state). Coordination of distributed systems leads to boiler plate patterns, and using Spring Cloud developers can quickly stand up services and applications that implement those patterns. They will work well in any distributed environment, including the developer’s own laptop, bare metal data centers, and managed platforms such as Cloud Foundry.

Spring Cloud Data Flow-Microservice based Streaming and Batch data processing for Cloud Foundry and Kubernetes. Spring Cloud Data Flow provides tools to create complex topologies for streaming and batch data pipelines. The data pipelines consist of Spring Boot apps, built using the Spring Cloud Stream or Spring Cloud Task microservice frameworks. Spring Cloud Data Flow supports a range of data processing use cases, from ETL to import/export, event streaming, and predictive analytics.

Spring Security-is a powerful and highly customizable authentication and access-control framework. It is the de-facto standard for securing Spring-based applications. Spring Security is a framework that focuses on providing both authentication and authorization to Java applications. Like all Spring projects, the real power of Spring Security is found in how easily it can be extended to meet custom requirements.

Spring Session- provides an API and implementations for managing a user’s session information.

Spring Integration-Extends the Spring programming model to support the well-known Enterprise Integration Patterns. Spring Integration enables lightweight messaging within Spring-based applications and supports integration with external systems via declarative adapters. Those adapters provide a higher-level of abstraction over Spring’s support for remoting, messaging, and scheduling. Spring Integration’s primary goal is to provide a simple model for building enterprise integration solutions while maintaining the separation of concerns that is essential for producing maintainable, testable code.

Sprint HATEOAS-provides some APIs to ease creating REST representations that follow the HATEOAS principle when working with Spring and especially Spring MVC. The core problem it tries to address is link creation and representation assembly.

Spring REST Docs-helps you to document RESTful services. It combines hand-written documentation written with Asciidoctor and auto-generated snippets produced with Spring MVC Test. This approach frees you from the limitations of the documentation produced by tools like Swagger.

Spring Batch-A lightweight, comprehensive batch framework designed to enable the development of robust batch applications vital for the daily operations of enterprise systems. Spring Batch provides reusable functions that are essential in processing large volumes of records, including logging/tracing, transaction management, job processing statistics, job restart, skip, and resource management. It also provides more advanced technical services and features that will enable extremely high-volume and high performance batch jobs through optimization and partitioning techniques. Simple as well as complex, high-volume batch jobs can leverage the framework in a highly scalable manner to process significant volumes of information.

Spring AMQP-The Spring AMQP project applies core Spring concepts to the development of AMQP-based messaging solutions. It provides a “template” as a high-level abstraction for sending and receiving messages. It also provides support for Message-driven POJOs with a “listener container”. These libraries facilitate management of AMQP resources while promoting the use of dependency injection and declarative configuration. In all of these cases, you will see similarities to the JMS support in the Spring Framework. The project consists of two parts; spring-amqp is the base abstraction, and spring-rabbit is the RabbitMQ implementation.

Spring for Android-Spring for Android is a framework that is designed to provide components of the Spring family of projects for use in Android apps. Like all Spring projects, the real power of Spring for Android is found in how easily it can be extended.

Spring CredHub-Spring CredHub provides client-side support for storing, retrieving, and deleting credentials from a CredHub server running in a Cloud Foundry platform. CredHub provides an API to securely store, generate, retrieve, and delete credentials of various types. Spring CredHub provides a Java binding for the CredHub API, making it easy to integrate Spring applications with CredHub.

Spring Flo-Spring Flo is a JavaScript library that offers a basic embeddable HTML5 visual builder for pipelines and simple graphs. This library is used as the basis of the stream builder in Spring Cloud Data Flow. Flo includes all the basic elements of an integration-flow designer such as connectors, control nodes, palettes, state transitions, and graph topologies — importantly, there is a textual shell, DSL support, and a graphical canvas designed for creating and reviewing comprehensive workflows.

Spring for Apache Kafka-The Spring for Apache Kafka (spring-kafka) project applies core Spring concepts to the development of Kafka-based messaging solutions. It provides a “template” as a high-level abstraction for sending messages. It also provides support for Message-driven POJOs with @KafkaListener annotations and a "listener container". These libraries promote the use of dependency injection and declarative. In all of these cases, you will see similarities to the JMS support in the Spring Framework and RabbitMQ support in Spring AMQP.

Spring LDAP-Spring LDAP is a library to simplify LDAP programming in Java, built on the same principles as Spring Jdbc. The LdapTemplate class encapsulates all the plumbing work involved in traditional LDAP programming, such as creating, looping through NamingEnumerations, handling Exceptions and cleaning up resources. This leaves the programmer to handle the important stuff — where to find data (DNs and Filters) and what to do with it (map to and from domain objects, bind, modify, unbind, etc.), in the same way that JdbcTemplate relieves the programmer of all but the actual SQL and how the data maps to the domain model. In addition to this, Spring LDAP provides Exception translation from NamingExceptions to an unchecked exception hierarchy, as well as several utilities for working with filters, LDAP paths and attributes.

Spring Mobile-is a framework that provides capabilities to detect the type of device making a request to your Spring web site and serve alternative views based on that device. Like all Spring projects, the real power of Spring Mobile is found in how easily it can be extended.

Spring Roo-A next-generation rapid application development tool for Java developers. With Roo you can easily build full Java applications in minutes.

Spring Shell-Users of the Spring Shell project can easily build a full featured shell ( aka command line) application by depending on the Spring Shell jars and adding their own commands (which come as methods on spring beans). Creating a command line application can be useful e.g. to interact with your project’s REST API, or to work with local file content.

Spring StateMachine-is a framework for application developers to use state machine concepts with Spring applications.

Spring Vault-Spring Vault provides familiar Spring abstractions and client-side support for accessing, storing and revoking secrets. It offers both low-level and high-level abstractions for interacting with Vault, freeing the user from infrastructural concerns. With HashiCorp’s Vault you have a central place to manage external secret data for applications across all environments. Vault can manage static and dynamic secrets such as application data, username/password for remote applications/resources and provide credentials for external services such as MySQL, PostgreSQL, Apache Cassandra, Consul, AWS and more.

Spring Web Flow-builds on Spring MVC and allows implementing the “flows” of a web application. A flow encapsulates a sequence of steps that guide a user through the execution of some business task. It spans multiple HTTP requests, has state, deals with transactional data, is reusable, and may be dynamic and long-running in nature.

Spring Web Services-Spring Web Services (Spring-WS) is a product of the Spring community focused on creating document-driven Web services. Spring Web Services aims to facilitate contract-first SOAP service development, allowing for the creation of flexible web services using one of the many ways to manipulate XML payloads. The product is based on Spring itself, which means you can use the Spring concepts such as dependency injection as an integral part of your Web service. People use Spring-WS for many reasons, but most are drawn to it after finding alternative SOAP stacks lacking when it comes to following Web service best practices. Spring-WS makes the best practice an easy practice. This includes practices such as the WS-I basic profile, Contract-First development, and having a loose coupling between contract and implementation.

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