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.
For transitioning users: To ensure the most successful migration, the return type of the StoredResponse getHeaderNames method was changed to com.ibm.websphere.servlet.response.CollectionEnumerationHybrid<String>. This type implements both Collection<String> and Enumeration. trns
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