Java frameworks are suitable for projects where cross-platform, stability and scalability are crucial. For Java projects, Spring Framework is used for dependency injection and aspect-oriented programming, and best practices include using SpringBean and SpringBeanFactory. Hibernate is used for object-relational mapping, and best practice is to use HQL for complex queries. JakartaEE is used for enterprise application development, and the best practice is to use EJB for distributed business logic.

Performance comparison of different Java frameworks: REST API request processing: Vert.x is the best, with a request rate of 2 times SpringBoot and 3 times Dropwizard. Database query: SpringBoot's HibernateORM is better than Vert.x and Dropwizard's ORM. Caching operations: Vert.x's Hazelcast client is superior to SpringBoot and Dropwizard's caching mechanisms. Suitable framework: Choose according to application requirements. Vert.x is suitable for high-performance web services, SpringBoot is suitable for data-intensive applications, and Dropwizard is suitable for microservice architecture.

Answer: Java backend framework and Angular frontend framework can be integrated to provide a powerful combination for building modern web applications. Steps: Create Java backend project, select SpringWeb and SpringDataJPA dependencies. Define model and repository interfaces. Create a REST controller and provide endpoints. Create an Angular project. Add SpringBootJava dependency. Configure CORS. Integrate Angular in Angular components.

3 common problems and solutions in asynchronous programming in Java frameworks: Callback Hell: Use Promise or CompletableFuture to manage callbacks in a more intuitive style. Resource contention: Use synchronization primitives (such as locks) to protect shared resources, and consider using thread-safe collections (such as ConcurrentHashMap). Unhandled exceptions: Explicitly handle exceptions in tasks and use an exception handling framework (such as CompletableFuture.exceptionally()) to handle exceptions.

The Template Method pattern defines an algorithm framework with specific steps implemented by subclasses. Its advantages include extensibility, code reuse, and consistency. In a practical case, the beverage production framework uses this pattern to create customizable beverage production algorithms, including coffee and tea classes, which can customize brewing and flavoring steps while maintaining consistency.

Java frameworks integrated with AI enable applications to take advantage of AI technologies, including automating tasks, delivering personalized experiences, and supporting decision-making. By directly calling or using third-party libraries, the Java framework can be seamlessly integrated with frameworks such as H2O.ai and Weka to achieve functions such as data analysis, predictive modeling, and neural network training, and be used for practical applications such as personalized product recommendations.

The Java framework provides predefined components with the following advantages and disadvantages: Advantages: code reusability, modularity, testability, security, and versatility. Disadvantages: Learning curve, performance overhead, limitations, complexity, and vendor lock-in.

Java frameworks are combined with edge computing to enable innovative applications. They create new opportunities for the Internet of Things, smart cities and other fields by reducing latency, improving data security, and optimizing costs. The main integration steps include selecting an edge computing platform, deploying Java applications, managing edge devices, and cloud integration. Benefits of this combination include reduced latency, data localization, cost optimization, scalability and resiliency.