Desktop null for autowired components in Spring loaded composers

asked 2011-06-16 04:14:25 +0800

jarnisb
36 ● 1

Hi Guys

I am working on a ZK app where the composers for individual pages are Spring beans (attached by using apply="${beanName}"). The composers all extend GenericForwardComposer and a number of components are autowired to fields in the composer class. When a page is loaded the first time, everything works as expected. However, if a page is reloaded, the desktop variable of the autowired components is set to null (which leads to NullPointerExceptions and UiException: You cannot access components belong to other desktop).

The problem disappears if I change the .zul file to use the composer class directly instead of using the spring bean.

All the composer beans have scope="session", thou I have also tried with "singleton", which does not solve the problem and "prototype" which breaks the autowiring.

We are using
ZK v. 5.0.7
Spring v. 3.0.0.RELEASE

There are a number of old threads describing this problem (incl http://www.zkoss.org/forum/listComment/12114 and http://www.zkoss.org/forum/listComment/8092, but none of them seem to describe the problem precisely, or to offer a good solution.

If needed, I will gladly post example code (the code I used to identity the problem include too much unrelated functionality to just post unedited). As this seems to be a very serious issue and limitation to the usefullness of using Spring in combination with ZK, I would very much appreciate a solution, or at least a good workaround.

Thanks in advance,

Jarnis Bertelsen
Developer
Telmore A/S