Code Generator for Eclipse Code

Fix numberformatexception

Fixing small bugs in the createion process

Implement model generator getter

Fix: the next button on the thid page is always active
return null for the getNextPage if the page instance is the third page

Fix the validation to be more flexible

Fix the validation to be more flexible

Fix initializing database connection

Completed the code for code generation

Throw exception instead of leaving error prone code behind
Code fragment should not be reached

Fixed bug concerning the updating through observer functionality