The Ujorm is an open source Java small library which provides non-traditional objects based on the key-value architecture to open up new exciting opportunities for writing efficient code. This library offers a unique ORM module designed for rapid Java development with great performance and a small footprint. The key features are type safe database queries, relation mapping by Java code, no entity states and a memory overloading protection cache.

The Ujorm (original name was UJO Framework) is designed primarily for the rapid Java development based on a relation database.

• java compiler can discover a syntax error of Ujorm database query similar like 4GL database languages
• easy to configure the ORM model by java source code, optionally by annotations and a XML file
• great performance, some types of SELECT query are very fast in comparison to its competitors
• lazy loading or the one request data loading of relations are supported optionally as a fetch strategy
• database tables, columns and indexes can be optionally updated according to Java metamodel in the run-time
• no confusing proxy or binary modified business objects
• very lightweight framework with no library dependencies in the run-time

• batch SQL statements for more rows like INSERT, UPDATE and DELETE are supported
• features LIMIT and OFFSET are available from the API
• nested transactions are supported using the partially implemented JTA
• resources for ORM mapping can be a database table, view or native SQL SELECT
• subset of table columns on SELECT can be specified for the SQL statement
• JDBC query parameters are passed by a 'question mark' notation to the PreparedStatement for a high security
• stored database procedures and functions are supported
• all persistent objects are based on the interface OrmUjo, namely on the implementation OrmTable
• internal object cache is based on the WeakHashMap class so that large transactions does not cause any OutOfMemoryException
• database indexes are created by the metamodel, added support for unique, non-unique indexes including the composed one

1. https://ujorm.org/
2. https://pponec.github.io/ujorm/

• Module ujo-orm,
• Module ujo-tools,
• Module ujo-web, look at the sample use.

The ORM module:

<dependency>
    <groupId>org.ujorm</groupId>
    <artifactId>ujo-orm</artifactId>
    <version>${ujorm.version}</version>
</dependency>

Module for Apache Wicket integration:

<dependency>
    <groupId>org.ujorm</groupId>
    <artifactId>ujo-wicket</artifactId>
    <version>${ujorm.version}</version>
</dependency>

The Java 7.0 is required to compile of the project souces, the Java 6+ is required to runtime. Use a one of the preferred tools to open the project:

• NetBeans IDE,
• InteliJ IDEA,
• Eclipse with some Maven pluggin, or use the,
• Maven toolkit if you like a console command line.