Some actions that use Generics make OGNL throw ClassCastException
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Key: WW-1495
URL: http://issues.apache.org/struts/browse/WW-1495
Project: Struts 2
Issue Type: Bug
Components: Actions, Expression Language
Affects Versions: 2.0.1
Environment: Kubuntu Linux 6.06 and 6.10 running Eclipse 3.2 with Web
Tools with an Apache Tomcat 5.5 integrated into the IDE.
Reporter: Vitor Souza
When the action class extends a class that uses generics (e.g. public class
ManageEmployeeAction extends CrudAction<Employee, Long> { }) and data is sent
from the web page (using Struts Forms built by the tag library) to be set in a
property from the class that is inherited from the superclass and defined as
generic (e.g., protected I[] ids;), OGNL cannot determine the type of the
property, falls back to String[] and throws a ClassCastException.
This issue has been further discussed in the forum:
http://forums.opensymphony.com/thread.jspa?threadID=48752. Attachments are
provided to illustrate the issue and propose a starting point for the fix.
However, it should NOT be considered a patch, since the creator of this "hack"
doesn't have enough knowledge of OGNL and Generics to assure its general
correctness.
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