Description:
This is a change we observed after upgrading to 3.1.7  .  Looking for a workaround?

We use the code: rsTable = DatabaseMetaData.getTables(null, null, null, tabletypes);  to
get all the tables in the database.  After that, for each table, we call the API
rsTable.getString("TABLE_CAT") to get the catalog name of this table.  

I found if I use mysql-connector-java-3.1.7-bin.jar, it will return an empty string.   If
I use mysql-connector-java-3.0.16-ga-bin.jar, I can get the correct catalog name.

Was there a change which caused this?  Is there a different way of doing this we can use
which will also work for 3.1.6 and below?

Thanks

How to repeat:
Use the code: rsTable = DatabaseMetaData.getTables(null, null, null, tabletypes);  to get
all the tables in the database.  After that, for each table,  call the API
rsTable.getString("TABLE_CAT") to get the catalog name of this table.  It will return
empty strings.

Fixed for 3.1.8 

Should accept null for catalog (meaning use current) 
in DBMD methods, even though it's not JDBC-compliant for legacy's sake.

Disable by setting connection property "nullCatalogMeansCurrent" to "false"
 (which will be the default value in C/J 3.2.x).