Mismatched JDBC and Java Type

I am using a short (Short) in my application for a particular data field
My understanding is that this should map to the JDBC type 'smallInt' which
in turn maps to the postgresql type int2.

However when I retrieve data via JDBC (jdbc7.0-1.2.jar, 7.0.3-2 engine)
the int2 fields are returned as java.lang.Integer instead of java.lang.Short.

Is this a bug?

----------- Example code below ----------
ResultSetMetaData md = rs.getMetaData();
while (rs.next()) {
for (int c=1; c <= md.getColumnCount(); c++) {
Object obj = rs.getObject(c);
Logger.println(c +
"\tcolumnName=" + md.getColumnName(c) +
"\tcolumnType=" + md.getColumnType(c) +
"\tcolumnTypeName=" + md.getColumnTypeName(c) +
"\tvalue=" + obj +
"\tvalueClass=" + obj.getClass().getName() );

will produce

...
10 columnName=active columnType=5 columnTypeName=int2 value=8
valueClass=java.lang.Integer
...

note that md.getColumnClassName() is not implemented so I don't know what it
would return.

===================
Mike Finn
Tactical Executive Systems
mike(dot)finn(at)tacticalExecutive(dot)com