[MRUNIT-65] return better error message when mapper or reducer is null for MapDriver or ReduceDriver

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.9.0
• Assignee: Jim Donofrio
• Reporter: Jim Donofrio
• Created: 26/Feb/12 06:37
• Updated: 26/Feb/12 16:30
• Resolved: 26/Feb/12 16:30

Description

Currently if you use the default constructor for MapDriver or ReduceDriver you just get a nullpointer exception instead of a more meaningful error stating that you did not specify a mapper or reducer class