Please give us the exact error message (doesn't need to be the whole stack trace but a few more lines from which we can see at which point the exception is thrown would be helpful...).

Uli

Jacob Arnold schrieb:
Thanks for the quick response. The source is exactly as here except I changed the package names:

http://lombok.demon.co.uk/tapestry4Demo/pages/dynamicSelectionList/TestDSLComponent2Source.html

The error occurs on line 7 of TestDSLComponent2.page:

<page-specification class="gov.nmcourts.caselookup.pages.TestDSLComponent2">

Thanks,
Jacob


Ulrich Stärk wrote:
Well, some mandatory parameter of some component must not be null :-)

How about giving us a bit more? Page template, page class, line in the template at which the error occurs...

Uli

Jacob Arnold schrieb:
I'm trying to get the DynamicSelectionList component working in an existing Tapestry 4.0 project.
http://lombok.demon.co.uk/tapestry4Demo/

I copied all of the source files from the custom class example into my own packages, but when I try to submit the form on the page, I get this error:

org.apache.hivemind.ApplicationRuntimeException
Parameter name must not be null.

Any ideas? Thanks!

J


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