Thanks Andreas. Before mailing to this list, I tried looking at the ognl documentation and I found the NullHandler interface but I wasn't sure how it worked with Tapestry or if it was possible to do it another way without altering the BOs.
Correct me if I'm wrong but what I understand is that Tapestry already implements a Hivemind service that does the null handling. All I have to do is make my BOs implement NullHandler interface. Am I right? Thanks a lot! Marcos On 6/29/07, Andreas Andreou <[EMAIL PROTECTED]> wrote:
http://tapestry.apache.org/tapestry4.1/tapestry-framework/hivedoc/config/tapestry.ognl.NullHandlers.html the way it works, is that you associate implementations of http://www.ognl.org/2.6.9/Documentation/javadoc/ognl/NullHandler.html with class types whose methods (or properties) may return null O/H Marcos Chicote έγραψε: > Hi! > I have a Table component (actually I have TableRows, TableView, and all > those other components that form a Table) and one of the columns in > TableView is declared like this: columnName:object1.object2.property. > > As you can see this can throw NullPointerException if either object1 or > object2 are null. > > To solve this problem, I have to alternatives: > a) Use a Block component called columnNameColumnValue an inside the > block an > Insert component with a value asociated with the page's class that > handles > nulls > b) Declare the column like: columnName:object1.propertyObject2. (that > it a > getPropertyObject2 method in object1 class that handles nulls). > > Is there a better way to solve this?? I would love something like a > prefix > that allows me to specify that whenever a NPE is found, a blank space is > rendered. Is something like that possible? > > I'm ussing Tapestry 4.1.1. > > Btw, great work with Tap4.1.2, congratulations! > > Thanks! > -- Andreas Andreou - [EMAIL PROTECTED] - http://andyhot.di.uoa.gr Tapestry / Tacos developer Open Source / J2EE Consulting --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
