OGNL/Tapestry 3: constant values become null after restart

[Greg Ward <gw...@python.net>]

I'm having a weird problem accessing Java constants with Tapestry 3.0.3
and OGNL 2.6.7.  Specifically, this bit of template code:

<span jwcid="@Conditional"
      condition="ognl:havePrivilege(@DataModels.UserModels.PrivilegeSet@AUDIT_USERS)">

works fine after restarting the whole servlet container (Tomcat 4.1.30),
but when I restart just my app, the OGNL expression
"@DataModels.UserModels.PrivilegeSet@AUDIT_USERS" (yes, our package name
is "DataModels.UserModels" -- legacy code and all that) evaluates to
null.  I have to restart Tomcat completely in order for this expression
to evaluate correctly.  Annoying.

PrivilegeSet is a fairly complex beast, but at its heart it's just a
typesafe enum with a bunch of constant values; here's the relevant
snippet from DataModels/UserModels/PrivilegeSet.java:

"""
package DataModels.UserModels;

[...]

public class PrivilegeSet
{
    [...]
    public static final Privilege AUDIT_USERS = 
        Categories.ADMIN.add( "audit_users" );
    [...]
}
"""

I just made a quick attempt to reproduce this problem in a trivial
"hello world" tapestry app -- no luck, it works fine.

Before I spend huge amounts of time attempting to reproduce and/or debug
this, I'm wondering if anyone has seen anything similar and knows of a
fix or workaround.

Thanks --

        Greg

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Re: OGNL/Tapestry 3: constant values become null after restart

[Kent Tong <ke...@cpttm.org.mo>]

Greg Ward <gward-tapestry <at> python.net> writes:

> works fine after restarting the whole servlet container (Tomcat 4.1.30),
> but when I restart just my app, the OGNL expression
> " <at> DataModels.UserModels.PrivilegeSet <at> AUDIT_USERS" (yes, our 
> package name
> is "DataModels.UserModels" -- legacy code and all that) evaluates to
> null.  I have to restart Tomcat completely in order for this expression
> to evaluate correctly.  Annoying.

I'm not sure if this will help, but you may try using a
context listener that calls:

  Introspector.flushCache();

on shutdown. See if it helps.

--
Author of a book for learning Tapestry (www.agileskills2.org/EWDT)


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