JAFFA is a Rich Web 2.0 POJO based Event-Driven SOA framework
...JAFFA is a Java web application development stack, build around Web 2.0 technologies (ExtJS, DWR, JAWR) with an extensive service architecture, meta-data layer and rules engine (based on JBoss AOP and Drools). It provides an event driven SOA infrastructure with advanced scheduling and queue sub-systems
Mnemosyne is an in-memory object database for Java. It uses AOP to achieve transparent persistence, and object level versioning and locking to provide ACID transaction support. Data is persisted through transaction logging and periodic system snapshots