Please check the property of the "Adaptive Form Container" electronic signature section for any reference.

Seems like the issue is with dependency version compatibility with the JDK version. https://github.com/adobe/aem-project-archetype/issues/920 

Here are some examples. https://help.adobe.com/en_US/livecycle/10.0/DesignerScriptingBasics/WS92d06802c76abadb57cc1b6e12a92343946-8000.html 

if(dropdown.rawValue != "Fish"){  // your code here}

You need to add condition like below if(dropdown.rawValue  != "Fish"){// then write your logic}

You need the make the form and fields inside the subform flowable to expand and shrink them on the basis of show/hide fields. For drop down selection, you can write the script in exit or change event and write your script in side it.  

In the doc:ready event we can check the client application and its version in Java script and show any message to the user. But to forcefully open it in Acrobat, I didn't find anything for this.

I tried this before, but I didn't face this issue. Are you getting any errors in the logs?

what's the error?Quick check: in bundles, see your jdbc driver in active status.

That will show the version of specific page, adaptive forms are embedded like component in page.