What is Java Spring and what‘s the advantage of that?

Java spring is a framework that used to develop java application.

according to Wikipedia:

The Spring Framework is an application framework and inversion of
control container for the Java platform. The framework’s core features
can be used by any Java application, but there are extensions for
building web applications on top of the Java EE (Enterprise Edition)
platform.

what modules does Java Spring framework contains?

The Spring Framework includes several modules that provide a range of services:

Spring Core Container: this is the base module of Spring and provides spring containers (BeanFactory and ApplicationContext).[12]

Aspect-oriented programming: enables implementing cross-cutting concerns.

Authentication and authorization: configurable security processes that support a range of standards, protocols, tools and practices via the Spring Security sub-project (formerly Acegi Security System for Spring).

Convention over configuration: a rapid application development solution for Spring-based enterprise applications is offered in the Spring Roo module

Data access: working with relational database management systems on the Java platform using Java Database Connectivity (JDBC) and object-relational mapping tools and with NoSQL databases

Inversion of control container: configuration of application components and lifecycle management of Java objects, done mainly via dependency injection

Messaging: configurative registration of message listener objects for transparent message-consumption from message queues via Java Message Service (JMS), improvement of message sending over standard JMS APIs

Model–view–controller: an HTTP- and servlet-based framework providing hooks for extension and customization for web applications and RESTful (representational state transfer) Web services.

Remote access framework: configurative remote procedure call (RPC)-style marshalling of Java objects over networks supporting Java remote method invocation (RMI), CORBA (Common Object Request Broker Architecture) and HTTP-based protocols including Web services (SOAP (Simple Object Access Protocol))

Transaction management: unifies several transaction management APIs and coordinates transactions for Java objects

Remote management: configurative exposure and management of Java objects for local or remote configuration via Java Management Extensions (JMX)

Testing: support classes for writing unit tests and integration tests

What is the advantage of Spring?

It is compatible with all other frameworks of java like Hibernate.

And the spring container can be used to develop and run test cases easier

Spring Transaction Management interface is very flexible it can configured to use local transactions in small application