[UIMA-4932] improve error message when sofa missing during add to indexes

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.8.1SDK
• Fix Version/s: 2.9.0SDK, 3.0.0SDK-alpha
• Component/s: Core Java Framework
• Assignee: Marshall Schor
• Reporter: Marshall Schor
• Created: 13/May/16 13:44
• Updated: 13/May/16 15:30
• Resolved: 13/May/16 15:30

Description

If the sofa reference for a FS which is a subtype of AnnotationBase is added to the index, an error is thrown saying the sofa is missing. Improve this by adding some likely causes useful to users receiving this message to enable tracking down the cause. A typical cause might be that the type system being used for deserialization of a CAS differs from the one used for serialization in that the FS when serialized was not a subtype of AnnotationBase.