• Should I use the existing framework in my projects?
Yes, in general, you should. The creators of the frameworks put a lot of work into them to make them good, and many others use the framework. This means that the code is well tested in practice. When you write your own code, it will only be tested by you and your team.
• What happens if there are errors in the structure, how can I fix them?
, . , , , -.
• , ?
, . . , , -. .
• , , , ?
, . , , , . , , .
• , Structs/Hibernate/ Spring, , .
, Spring, Hibernate Struts . , - . , .