12.3.1 Migration to alternative functionality

You might need to migrate the functionality used by Application Server version 9 and Developer version 9 to alternative functionality so that the functionality can operate in Application Server version 11 and Developer version 11. Check the following table, and migrate applications as needed. Functionality not included in the table is compatible with Application Server version 9 and Developer version 9.

Table 12‒3: Cases in which application migration is required
Functionality	Case in which migration is required	Reference
Servlet	If the application uses non-supported Servlet 3.0 APIs and the `UnsupportedOperationException` exception is expected to be thrown	12.3.2(1)
Servlet	If the application uses the dynamic servlet definition API to invoke the `addMapping` method of `ServletRegistration` to map to the context root (URL pattern is `/`), but the mapping is not expected to be performed correctly	12.3.2(2)
CDI	If the application uses CDI annotations, but CDI is not expected to operate without `beans.xml` being stored in the application archive	12.3.3(1)
CDI	If a library having a Portable Extension implementation class is added to the class path or stored in the application, but the Portable Extension is not expected to operate	12.3.3(2)
JAX-RS	If the application was using the Cosminexus JAX-RS engine (if `cjjaxrs.jar` was added to the class path)	12.3.4(1)
	If the application was using parameters unique to the Cosminexus JAX-RS engine	12.3.4(2)
	If the application was using client APIs for RESTful Web Services unique to the Cosminexus JAX-RS engine	12.3.4(3)
JPA	If the application was using parameters unique to the CJPA provider (User properties that start with `cosminexus.jpa`, or values specified in `<property>` tags in `persistence.xml`)	12.3.5(1)
	If the application was using the persistence units or persistence context for container management. This case applies when one of the following is used: The `javax.persistence.PersistenceUnit` annotation The `javax.persistence.PersistenceContext` annotation The `<persistence-unit-ref>` element of DD The `<persistence-context-ref>` element of DD	12.3.5(2)
	If the application was using a database other than HiRDB for the persistence destination database	12.3.5(3)
JSF	If the application was using JSF (if `cjsf.jar` was added to the class path)	12.3.6(1)

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