Heads up: there are two API changes in 2.4 that might bite you on
upgrading:
* If you are subclassing QueryParser and override addClause or
getBooleanQuery, you need to change the argument type from Vector
to List, else your method won't be called. This was caused by
LUCENE-1369, where I accidentally broke back compatibility
(sorry!!).
* If you use Document.getFieldables, getFields, getValues or
getBinaryValues, these methods now return an empty list instead of
null if there are 0 things to return. If you have code that
checks != null you need to change it to .size() != 0. This was
from LUCENE-1233
Mike
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