• framework has a type safe query language which allows the java compiler find a syntax error similar like a 4GL language
• never more a LazyInitialization exception though a lazy initialization is supported
• no confusing proxy business objects
• no list properties are supported but a special object called UjoIterator is designed for a collection. The UjoIterator provides a toList() method for example
• easy to configure the ORM model by java source code, optionally by annotations and a XML file
• great performance, e.g. multi SELECT is eight times faster in comparison with Hibernate
• small size of JAR file and no more library dependencies

Some other features

• resources for ORM mapping can be a database table, view, or your own SQL SELECT
• JDBC query parameters are passed by a question notation to the PreparedStatement for a high security
• all persistent objects are based on the OrmUjo interface, namely on the OrmTable implementation
• internal object cache is based on the WeakHashMap class so that large transactions does not cause any OutOfMemoryException
• the API was inspired mainly by Canyenne and Hibernate frameworks. I would like to thank the authors for good work.