[STR-1856] Special circumstances which struts fails to return the same class in the war file giving a class cast exception

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Incomplete
• Affects Version/s: 1.1.0
• Component/s: Website
• Environment: Operating System: other; Platform: Other
• Bugzilla Id: 24994
• Assignee: Unassigned
• Reporter: notzippy
• Created: 26/Nov/03 06:42
• Updated: 16/Feb/11 19:53
• Resolved: 23/Apr/06 04:45

Description

Context 1 contains beta of testApp which has this form defined
<form name="joe" type="ca.one.two">
</form>

Context 2 contains Omega of testApp which has enhancements to this form defined
<form name="joe" type="ca.one.two">
</form>

Context 1 and context 2 have been compiled at different times so they will have
different compiled versions of ca.one.two class

When user 1 goes into context 1 the following actions are performed
The request processor is retrieved
the processors processActionForm is called
The RequestUtils.createActionForm is called
If the form does not exist and it is a DynaActionForm the
DynaActionFormClass.createDynaActionFormClass
In this method the static dynaClasses hashmap is checked for an instance of the
object keyed by name of the form and the module configuration name
If this cannot be found a new instance of DynaActionFormClass is created and
configured with the form. This class is stored in the hasmap under the key.
A new instance of the form is created by calling
DynaActionFormClass.newInstance() - this method performs the following actions
This calles the RequestUtils.applicationClass().
This loads the class using Thread.currentThread().getContextClassLoader()
This then creates a new instance of the class loaded by performing a
class.newInstance();

Now user 2 goes into context 2 the following actions are performed
The request processor is retrieved
the processors processActionForm is called
The RequestUtils.createActionForm is called
If the form does not exist and it is a DynaActionForm the
DynaActionFormClass.createDynaActionFormClass
In this method the static dynaClasses hashmap is checked for an instance of the
object keyed by name of the form and the module configuration name.

• • Since user 1 already created a dynclass of this type a new instance is NOT
    created.
    A new instance of the form is created by calling
    DynaActionFormClass.newInstance() - this method performs the following actions
  • Since user 1 already loaded the form class it is NOT reloaded.
    This then creates a new instance of the class loaded by performing a
    class.newInstance();
    A new instance of the form is returned to the user
    The next step in the process then hits the executeAction method of the servlet.
    This attempts to cast the new form (created by context 1's class) to a class
    created by context 2's class.
    This results in a class cast exception because the 2 classes are not compatable
    with eachother.

Note
====
If Omega is restarted and user 2 access the form before user 1 then the reverse
occurs. This is due to us calling DynaActionFormClass.clear() in the
initialization of the servlet.

Solution
========
It be nice if DynaActionFormClass was context relative