getIndexInfo() fails

Hi, folks!

I try to use the above method in a project to find out whether
an index has to be created or not.

 ResultSet rs = dbInfo.getIndexInfo(null, null, tableName,false, true);

What really drives me nuts is that the ResultSet is always
empty. I even tried it the hard way and nested four for loops
that cycled through possible arguments ( null, "", "%" for
the strings and true and false for the booleans) and even tried
to use the indexName instead of the tableName. Nothing. It also
doesn't matter which JDBC version I use (currently, it's
jdbc7.1-1.2.jar for PostgreSQL 7.1.2 and J2SDK1.3). I
double-checked the table name I pass and the table in question
really has an index associated to it (that's what psql says).

Any idea what could go wrong here? 

Thanks in advance. 
Matthias
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PADDLE-PG