How to create a object in java action after deployed into eclipse?
Creating an object works as it works in java.
Clasname objectname = new Classname(); //something like this
But I agree, the apidocs may also help.
See https://docs.mendix.com/apidocs-mxsdk/apidocs/ for reference.
IMO the easiest way to do this is to call a microflow from java that created the object for you.
Alternatively you can use