Studies indicate that developing persistence logic consumes most (60%-80%) of the development time in enterprise application. Most common way to develop persistence logic in java is hard coded SQL and JDBC calls. Bugs in persistence logic designed in this way usually discovered late in quality assurance process or even worse left undiscovered until application deployed into production environment. Cost of fixing bug exponentially is increasing depending on time since bug was introduced.

There are several ways to improve this situation with JScheme.

Generate persistence code that eliminate need to wrote hard coded SQL and JDBC mapping code.
Generate value objects that used to pass chunk of information not a single value in J2EE architecture, to improve code readability and network performance.
Track data model changes, and enforce data model and code compliance.

The advantages are:

Reduced development time;
Early feedback about database and code incompliance;
High performance and scalability;
Lower cost of maintenance;
Database vendor independence;

Development scenarios with JScheme

Initial application development:

Analysis requirements, and design object, component and data model.
Develop database schema based on data model.
Generate persistence logic and value object classes using JScheme.
Develop components using java objects generated by JScheme.

Extending functionality of application:

Change database model to accommodate new functionality.
Regenerate persistence logic classes.
Rebuild and retest application. Simple rebuild catch most of database-object incompatibility.

Support XP or Agile modeling principals.

Those principals are:

Use simple tools
Early feedback
Testable design

How it works?

JScheme has two components:

Resync
loads data model from database and save it in vendor independent format in XML file. This module itself is database vendor specific. And currently there is only one for Oracle. Resync modules for open source databases such us SapDB and MySQL are coming soon.

Generate
Based on information in XML file created by Resync, this module generates persistence logic java classes.


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