In the latest CVS version there is a bug in FBResultSetMetaData:

Retrieving ResultSetMetaData from ResultSets returned by methods
like DatabaseMetaData.getTypeInfo, getColumns etc a
NullPointerException is thrown:

java.lang.NullPointerException
at org.firebirdsql.jdbc.FBResultSetMetaData.getExtendedFieldInfo
(FBResultSetMetaData.java:793)
at org.firebirdsql.jdbc.FBResultSetMetaData.<init>
(FBResultSetMetaData.java:65)
at org.firebirdsql.jdbc.FBResultSet.getMetaData
(FBResultSet.java:539)
...


Regards,
Stephan