AEM Slightly - How to call java method whose name is stored in variable - expression inside expression doesn’t work in sightly

[karanmahi]

In AEM 6.5 sightly I have initialized the sling model class. Now, I want to call the method from that class. But method name is read from some variable (basically I read method name from other location). When I use that variable it doesn’t work. I know sightly doesn’t allow expression inside an expression, so would like to know if there is an alternative to fit this need.

<sly data-sly-use.detailsModel="org.svc.core.model.DetailsModel"/>

${detailsModel.{methodNameVariable}} - doesn’t work (if the method name is read from some  variable) 

${detailsModel.methodName} - works (if put the method name directly there)

[Asutosh_Jena_]

Hi @karanmahi 

What is the requirement where you are reading the method name from a variable?

You need to call the method directly by the sling model reference to make it work.

<sly data-sly-use.detailsModel="org.svc.core.model.DetailsModel"/>
${detailsModel.methodName}

Thanks!

[karanmahi]

I have a custom requirement to read method name dynamically from osgi.

[Anudeep_Garnepudi · Accepted solution]

@karanmahi 

I think this is not directly possible. One way you can do is, in your Model class itself call the method inside a getter method and return the value. Call that Sling Model getter method in HTL.

To call method using method name(String/Variable) use reflection API.

Refer: https://www.tutorialspoint.com/How-do-I-invoke-a-Java-method-when-given-the-method-name-as-a-string#....

[Kiran_Vedantam]

Hi @karanmahi,

If you want to read the method name, create a variable, assign the method name to that variable and fetch it via getter and setter in HTL.

Hope this helps.

Thanks,

Kiran Vedantam

[BrianKasingli]

@karanmahi you can have your @PostConstruct method invoke your method which will set the variable's value. OR you can ensure that your method is following this naming convention getMyMethod(); from sightly you can call ${detailsModel.myMethod}.

Anything getSomething(); sightly will allow you to call the method in camelCased (in this example ${detailsModel.something);