Harry Chan created WW-4244:
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Summary: ShowConfigAction.execute throws InstantiationException
when the Action has NO nullary constructor
Key: WW-4244
URL: https://issues.apache.org/jira/browse/WW-4244
Project: Struts 2
Issue Type: Bug
Components: Plugin - Config Browser
Affects Versions: 2.3.15.3
Reporter: Harry Chan
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
{quote}Unable to execute
org.apache.struts2.config_browser.ShowConfigAction{quote}
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.
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