DatabaseMetaData.getTables() resultset empty?

[Ole Ersoy]

Hi,

I'm trying to use DatabaseMetaData.getTables() to get a list of tables 
contained in a derby database.  I run the statement like this (I made sure 
tables are present by browsing using the eclipse Data Source explorer first):
ResultSet resultSet = metaData.getTables(null, null, "%", null);

But resultSet is empty.  I also tried it like this:

ResultSet resultSet = metaData.getTables(null, null, "EXISTING_TABLE_NAME", 
null);

Still no love.  Anyone have any ideas on what I could be doing better?  

Thanks,
- Ole