CODEWITHSUNDEEP
jspstruts2ognl
Nextor
Nextor

Reputation: 105

Struts2 devMode Exception when using "key" attribute in submit tag

I'm using Struts2 with devMode turned on to catch as many warnings and errors as possible. Now I got across with some SEVERE notification that is only notified in devMode.

I'm using the submit tag and I include the key attribute to get the button text "Entrar" from a property called global.BOTON_LOGIN. The button is part of a form that calls an action mapped to the class actions.LoginAction:

<s:submit key="global.BOTON_LOGIN" type="button" />

The text of the button displays correctly and when I push this button everything works fine, except for this SEVERE notification showing up in the log:

30-Mar-2015 00:46:37.855 SEVERE [http-apr-8080-exec-146] com.opensymphony.xwork2.util.logging.jdk.JdkLogger.error Developer Notification (set struts.devMode to false to disable this message): Unexpected Exception caught setting 'global.BOTON_LOGIN' on 'class actions.LoginAction: Error setting expression 'global.BOTON_LOGIN' with value ['Entrar', ]

I have noticed that the HTML code generated for the button is:

<button type="submit" id="login_global_BOTON_LOGIN" name="global.BOTON_LOGIN" value="Entrar">Entrar</button>

My workaround to get rid of that SEVERE entry is to use the value attribute and the getText method instead of the key attribute:

<s:submit value="%{getText('global.BOTON_LOGIN')}" type="button" />

which in turn generates that HTML code:

<button type="submit" id="login_0" value="Entrar">Entrar</button>

and the SEVERE notification is gone.

Is there something I do wrong in the first case?

Upvotes: 1

Views: 701

Answers (1)

Roman C
Roman C

Reputation: 1

You have used a key attribute's value that didn't bind a submit button to the action. Struts UI tags usually bind the name attribute's value to the action. According to Struts docs page a key parameter is

Set the key (name, value, label) for this particular component

The first is a name attribute is used to parse for OGNL expression to set a value to the value stack. As far as you don't have such value the OGNL exception is thrown, but parameters interceptor used to catch and ignore this kind of exceptions. And only if you have devMode is turned on you can see this exception in the logs.

Usually if you are using a key attribute in the Struts tag you should use the same property name as a key in the properties file, so it correctly bind the action property.

Upvotes: 1

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