classes (v 1.2.128) connect to the database. The automatic upgrade .jar file must be present, and the url
  must contain NO_UPGRADE=TRUE

Referential integrity: it was not allowed to delete a row with NULL in the parent table, if there was a row with NULL in the child table.

CREATE VIEW now supports the OR REPLACE clause

Experimental feature to support case sensitive catalog names and database names using the DATABASE() method.

Statements with a nested query and a condition that was always NULL threw an IndexOutOfBoundsException.

LOB storage: LOBs added with "h2.lobInDatabase" enabled couldn't be read later with this option disabled.