If you use BRMS version 6.4 and install Red Hat Decision Manager version 7.0, you need to migrate your existing projects to the new product.

You can move the applications (now called decision services) that you developed using the Business Central workbench to the new equivalent, Decision Central. You do not need to change the underlying code manually to complete this migration.

Decision services that you developed in Java code (for example, in Eclipse) require modification for Red Hat Decision Manager 7.0. You must update the dependencies in the pom.xml file for each project and rebuild the project. Some changes in the new version might cause known build errors; in this case, you must modify the code.

To migrate your Java client applications, you also must update the dependencies in the pom.xml file for each project. If your application uses embedded BRMS engines (Drools, OptaPlanner), this change also updates the engines. If the application calls the Decision Server, the API client library is updated.

If your client application is not developed with the Java client library and uses the REST API to interact with the KIE server (Decision Server), you might need to modify it to adapt to a small incompatible API change.

You can replace your KIE servers with new Decision Servers simply by stopping the old servers and starting the new ones on the same hosts. You can use Decision Server 7.0 to run KJAR files created in BRMS 6.4. However, for optimal performance, migrate your projects to Red Hat Decision Manager 7.0 and rebuild them.