Try to check this line:String contentPath = (String) request.getAttribute("granite.ui.form.contentpath");Let me know what is the output.

Have you already tried to change the Apache Sling Request Parameter Handling configuration?You can select like Default parameter encoding the UTF-8 instead of ISO.

Could you provide us the example code you are using? It's an OSGi component? 

If you try to open the url from the system console, you have a 404?something like: system/console/jmx/org.apache.jackrabbit.oak%3Aid%3D14%2Cname%3D%22repository+manager%22%2Ctype%3D%22RepositoryManagement%22

Ok,Inside AEM all the js files that are included in the js.txt are included in one single clientlib. So your validator (even if is inside a folder) is part of the clientlib foundation because the folder validation is just only an nt:folder and not a clientlib.So is not possible in your case to overr...

I think that what you want to do is not correct. You want override totally foundation clientlib, why?If you want to modify some behaviour you can do this just extending the clientlib, and this is performed just putting in your clientlib the same categories of foundation clientlib.

Before calling the other component with selectors try to define a template:<template data-sly-template.objectValue="${@ key, value}">

You can create different view in AEM with usage of selectors.What you can do is a template with 2 different view, configurable with page properties.It could be a solution for you? if yes i can provide you some example code.

        You are in the servlet so you can use something like this: response.sendRedirect()

        So what you need is just to have 2 different view of the same page? i.e. homepage?