error-handling.md

Error Handling.

Contents at a Glance.

• About
• Documentation.
• Help

About.

Documentation.

• Use exceptions, not return codes.
• try-catch-finally block.
• Not catch Errors.
• Not catch Throwable.
• Catch all exceptions.
• Never use checked exceptions.
• Context in exceptions
• Context in exceptions message.
• Custom exception always should have a constructor that takes another exception. Example -> UILayoutException(DomainLayoutException(DaoLayoutException(RecordNotFound())))
• Don't return null. Think about 'null object pattern'.
• Don't pass null to methods

Help.