Java Persistence Performance

Perhaps I'm naive, but I always thought Java serialization must surely be the fastest and most efficient way to serialize Java objects into binary form. After all, Java is on it's 7th major release, so this is not new technology, and since every JDK...

EclipseLink 2.5 added several new JPQL features and supported syntax.
These include:
HQL compatibility

The main goal of the EclipseLink 2.5 release was the support of the JPA 2.1 specification, as EclipseLink 2.5 was the reference implementation for JPA 2.1. For a list of JPA 2.1 features look here, or here.
Most of the features that went into the release were to support JPA 2.1 features, so there was not a lot of development time for other features. However, I was still able to sneak in a few cool new performance features. The features are not well documented...

One of the most effective database optimizations is batch writing. Batch writing is supported by most modern databases and part of the JDBC standard and is supported by most JPA providers.
Normal database access consists of sending each DML (insert, update, delete) statement to the database in a separate database/network access. Each database access has a certain amount of overhead to it, and the database must process each statement independently...