we used a Java thing called Prevlayer or something... Prevayler. From http://prevayler.org/ http://prevayler.org/ : What is Prevayler? Prevayler is an open

we used a Java thing called Prevlayer or something... Prevayler. From http://prevayler.org/ http://prevayler.org/ : What is Prevayler? Prevayler is an open source object persistence library for Java. It is an implementation of the Prevalent System design pattern, in which business objects are kept live in memory and transactions are journaled for system recovery. Prevayler is the simplest and fastest way to provide ACID persistence for your "plain old Java objects".