Switch more to use IOException.
Fix findBug warning.
Fix findBug warning.
Address findbug warning.
Remove extra system.out.println
Address findbug warning.
Address findbug warning.
Merge pull request #45 from tonyhuang/errorcode

Switch more to use IOException.
Fix typo.
use bytes.comapreTO for type_schema and table_schema comparison.
Merge pull request #48 from tonyhuang/findbug

Address various warnings from findBug.