https://issues.apache.org/bugzilla/show_bug.cgi?id=52393
Bug #: 52393
Summary: MapELResolver.getType always returns Object.class
instead of the real type
Product: Tomcat 7
Version: 7.0.22
Platform: PC
OS/Version: Linux
Status: NEW
Severity: blocker
Priority: P2
Component: Servlet & JSP API
AssignedTo: dev@tomcat.apache.org
ReportedBy: qiuyunzh...@hotmail.com
Classification: Unclassified
I upgrade my tomcat from 7.0.12 to 7.0.22 for my Myfaces web application. Here
is all related apps' version.
tomcat: 7.0.22
Myfaces: 1.2.9
Spring: 3.6
Os: Cent OS 5.4/Ubuntu 11/ Windows
JRE:1.6.0.30/1.6.0.24
Scenario: My application runs smooth for more than one months on tomcat 7.0.12.
Due to security consern, I upgrade tomcat to 7.0.22. At first, it seems
everything is ok. However, there is a jsp page using Myfaces' datatable
components. Once I submit the datatable to back bean. It throws a
ClassCastException, which always says that a MyClass could not be casted to
List<MyClass>. After traced the code step by step, I found it's caused by
MapElResolver.getType(ELContext context, Object base, Object property). Here is
the 7.0.22 version implementation:
public Class<?> getType(ELContext context, Object base, Object property)
throws NullPointerException, PropertyNotFoundException, ELException
{
if (context == null) {
throw new NullPointerException();
}
if (base instanceof Map<?,?>) {
context.setPropertyResolved(true);
return Object.class;
}
return null;
}
In fact, in version 7.0.12 the implementation is:
public Class<?> getType(ELContext context, Object base, Object property)
throws NullPointerException, PropertyNotFoundException, ELException
{
if (context == null) {
throw new NullPointerException();
}
if (base instanceof Map<?,?>) {
context.setPropertyResolved(true);
Object obj = ((Map<?,?>) base).get(property);
return (obj != null) ? obj.getClass() : null;
}
return null;
}
You see, in the new version, it doesn't return the value of Map's specific
type, but only the base Object type.
This effects
org.apache.myfaces.component.html.ext.updateModelFromPreservedDataModel.updateModelFromPreservedDataModel(FacesContext
context) to only get the first element of the list to set to its back bean's
attribute and finally leads to ClassCastException.
Not sure why change the getType method and it definitely not the correct
function.
Thanks a lot.
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