diff -up melati-0.7.8/poem/src/main/java/org/melati/poem/dbms/Postgresql.java~ melati-0.7.8/poem/src/main/java/org/melati/poem/dbms/Postgresql.java
--- melati-0.7.8/poem/src/main/java/org/melati/poem/dbms/Postgresql.java~	2007-02-08 16:10:34.000000000 +0100
+++ melati-0.7.8/poem/src/main/java/org/melati/poem/dbms/Postgresql.java	2009-11-24 08:40:52.000000000 +0100
@@ -92,8 +92,8 @@ public class Postgresql extends AnsiStan
    * @see org.melati.poem.dbms.AnsiStandard#canDropColumns(java.sql.Connection)
    */
   public boolean canDropColumns(Connection con) throws SQLException {
-    if (con instanceof org.postgresql.jdbc1.AbstractJdbc1Connection) {
-      return ((org.postgresql.jdbc1.AbstractJdbc1Connection)con).
+    if (con instanceof org.postgresql.jdbc2.AbstractJdbc2Connection) {
+      return ((org.postgresql.jdbc2.AbstractJdbc2Connection)con).
                    haveMinimumServerVersion("7.3");
     }
     return false;
