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Only component classes should go in the Tapestry-controlled packages (pages, components, mixins and base under your application's root package). By convention, simple data objects should go in a data package, and Hibernate entities should go in an entities package.

I get an error about "Page did not generate any markup when rendered." but I have a template, what happened?

The most common error here is that the case of the page class did not match the case of the template. For example, you might name your class ViewOrders, but name the template vieworders.tml. The correct name for the template is ViewOrders.tml, matching the case of the Java class name.

Worse, you may find that your application works during development (under Windows, which is case insensitive) but does not work when deployed on a Linux or Unix server, which may be case sensitive.

The other cause of this may be that your template files simply are not being packaged up correctly with the rest of your application. When in doubt, use the Java jar command to see exactly whats inside your WAR file. Your page templates should either be in the root folder of the WAR, or package with the corresponding .class file.