Problems with getTables marked

Hi.
I need to obtain a table description in java with MySql database.
The javaapi says:

Code:

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method:
public ResultSet getTables(String catalog,
                          String schemaPattern,
                          String tableNamePattern,
                          String[] types)
                    throws SQLException

    Retrieves a description of the tables available in the given catalog. Only table descriptions matching the catalog, schema, table name and type criteria are returned. They are ordered by TABLE_TYPE, TABLE_SCHEM and TABLE_NAME.

    Each table description has the following columns:

      1. TABLE_CAT String => table catalog (may be null)
      2. TABLE_SCHEM String => table schema (may be null)
      3. TABLE_NAME String => table name
      4. TABLE_TYPE String => table type. Typical types are "TABLE", "VIEW", "SYSTEM TABLE", "GLOBAL TEMPORARY", "LOCAL TEMPORARY", "ALIAS", "SYNONYM".
      5. REMARKS String => explanatory comment on the table
      6. TYPE_CAT String => the types catalog (may be null)
      7. TYPE_SCHEM String => the types schema (may be null)
      8. TYPE_NAME String => type name (may be null)
      9. SELF_REFERENCING_COL_NAME String => name of the designated "identifier" column of a typed table (may be null)
      10. REF_GENERATION String => specifies how values in SELF_REFERENCING_COL_NAME are created. Values are "SYSTEM", "USER", "DERIVED". (may be null)

    Note: Some databases may not return information for all tables.

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The REMARKS is my target, but if i try:

Code:

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Connection con = DriverManager.getConnection("jdbc:mysql://"+args[0],args[1],args[2]);
ResultSet rs = con.getMetaData().getTables(null, null, "AZIONE", null);
while(rs.next()){
                System.out.println(rs.getString(""));

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I obtain a blank line.
Why?

Thanks