Migration scenario for the getHeaderNames method
WebSphere® Application Server Version 8 and later supports the Java™ Servlet 3.0 API.
As part of the Java Servlet
3.0 API, the following method is included in the HttpServletResponse:
Collection<String> getHeaderNames()
The com.ibm.websphere.servlet.response.StoredResponse class that
existed before WebSphere Application
Server Version 8 had the following method:
Enumeration getHeaderNames()
Because StoredResponse implements HttpServletResponse, StoredResponse no longer compiles without changing the return type of its getHeaderNames method to a type implementing Collection<String>. This change breaks any existing application using the old Enumeration return type.
