Nested left joins with group by cause NPE when two subsequent levels have null
values
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Key: IBATISNET-232
URL: https://issues.apache.org/jira/browse/IBATISNET-232
Project: iBatis for .NET
Issue Type: Bug
Components: DataMapper
Affects Versions: DataMapper 1.6.1
Reporter: Oikonomopoulos Spyros
Attachments:
DataMapper.MappedStatements.PropertStrategy.GroupByStrategy.patch
Region (region_id, name) values: (1, 'reg1') (2, 'reg2')
State (state_id, region_id, name) values: (1, 1, 'state1')
City (city_id, region_id, state_id, name) values (1,1,1,'city1')
A nested group with left joins will create the following rows:
1 reg1 --- 1 1 state 1 --- 1 1 1 city1
2 reg2 --- null --- null
Now during construction of the object hierarchy iBatis, for the second row
tries to set the "cities" collection of the state object, which unfortunately
is null, so an NPE is raised.
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