Page recorder locked after commit

[Petter Måhlén <pe...@elevance.se>]

Hi,

I have a problem with component parameters and properties. I have a
component that presents a table of some items and allows the user to create
new or delete existing items depending on some input parameters. In the
component specification, I have the following:

------
  <parameter name="taskList" type="java.util.List" direction="in"
required="no">
    <description>
    A list of the tasks for which new reports should be created. 
    </description>
  </parameter>

<snip />
  
  <property-specification name="taskReports"
type="org.apache.tapestry.form.ListEditMap"   persistent="yes" />
----------

Previously, I bound the taskReports property to a member of the Visit, but
that's really ugly, I think, so I would prefer using a persistent property
like above. The ListEditMap is initialised based on the taskList parameter,
and I do that in the prepareForRender() method. However, that gives me an
ApplicationRuntimeException with the following message:

Page recorder for page Report is locked after a commit(), but received a
change to property taskReports of component Report/oldReports.

And I cannot use the pageBeginRender() method to do initialisation either,
because at that time the taskList parameter has not yet been initialised,
being direction "in". I suppose I could try changing the direction of the
parameter, but there are two problems with that: 1) it is an "in" parameter
only (not changed by the component), and 2) I honestly don't understand the
description of the different directions in the documentation so I can't say
what would be the best choice.

Does somebody know of a way out of this that doesn't bloat my Visit object?
What is the meaning of the exception?

/ Petter


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