In my case, I use Guice for DI and constructor injection is used in many Actions.
When I enable the Config Browser feature and click the Action in the Action information page, it shows the error message
Unable to execute org.apache.struts2.config_browser.ShowConfigAction
After a brief code tracing, I found that in the ShowConfigAction.execute(), it uses clazz.newInstance() for creating the action instance. And the java-doc of the newInstance() claims that it would throw the InstantiationException if the class has no nullary constructor.
I think one of the quick fix would be added default-constructor into those Actions(I have tested it and it works). However, I think it would not be a good solution as the extra constructor is a redundancy to me and would increase the maintenance cost.
I am wondering if the ShowConfigAction could use ObjectFactory.buildBean() for creating the action instance.
P.S: Please correct me if I use the Config Browser Plugin in the wrong way.