[CAY-2728] Add ExtendedType to generate user-friendly exceptions for internally used values

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 4.2.B1
• Fix Version/s: 4.2.RC1
• Component/s: Core Library
• Assignee: Nikita Timofeev
• Reporter: Nikita Timofeev
• Created: 11/Jan/22 13:36
• Updated: 02/Feb/22 09:05
• Resolved: 02/Feb/22 09:05

Description

We have some internal values that could be used in a DB query and cause exceptions. In that case all the information user get is a confusing message like this: "Haven't found suitable ExtendedType for class 'org.apache.cayenne.access.flush.IdGenerationMarker'". See CAY-2726 for example.

We should add some special ExtendedType to handle those types and generate user-friendly exceptions.