Spring Framework is one of the most popular Java frameworks out there. It is an open-source framework that provides comprehensive infrastructure support for developing Java applications. It includes modules for web development, data access, security, and more.

2. Hibernate

Hibernate is a powerful and popular ORM (Object Relational Mapping) framework for Java. It simplifies the process of mapping an object-oriented domain model to a relational database. With Hibernate, developers can focus on the business logic of their application, while the framework handles the persistence layer.