Using the Java Business Delegate pattern and the Java Session Facade pattern, the Java service interface makes service rules available to external, Java-based applications as if the service rules were public methods of a Java class.
To use Java service rules, the Pega Platform must be deployed as an enterprise application, not as a Web application. When the Pega Platform is deployed as an enterprise application, two EJBs (PRServiceStateless and PRServiceStateful) implement the session facade. They provide the public interface for remote and local access to Pega Platform Java and EJB services.
Java services generally process service requests synchronously. That is, they immediately perform their requested processing and return a configured return value while the calling application waits. However, you can configure Java services to process service requests asynchronously, which means the service queues the request for asynchronous execution and the calling application calls back later for the results. Additionally, you can configure synchronous Java services to check for specific error conditions that you expect will be temporary — work item locks, for example — and then queue service requests that fail for those reasons for another attempt at a later time.
Use the Application Explorer to see Service Java rules in your application. Use the Records Explorer to list all Service Java rules that are available to you.
Service Java rules belong to the Integration-Services category. A Service Java rule is an instance of the Rule-Service-Java rule type.