Several questions about spring

Here are some questions about spring.

1. To what extent can a beginner start spring learning?

2. Do I have to learn spring from J2EE developers?

3. Are there any differences between spring learning and application capabilities? (If yes, what is the basis)

4. What are spring books and forums?

5. Under what circumstances should spring be incorporated into the project for application? (Which scenarios are most suitable for spring applications)

6. After the emergence of Ruby on Rails, can spring meet the requirements of agile Internet development?

7. How many enterprises apply spring to existing development?

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Several additional questions:

1. What is the performance of spring Web applications compared to the development of simple frameworks such as JSP or struts?

2. Spring can bond different levels of solutions, but the Java field never lacks a good framework, whether it is the MVC layer or the ORM layer. When we use spring, what is the basis for selection in these frameworks?

3. The open-source business in the Java field has never been prosperous. As a product looking forward to inclusive open-source frameworks, can spring's R & D and update speed meet the needs of the Java open-source and enterprise application fields?