Invoke a Java function and force return value of the call to be retrieved as a Java object reference.
j_invoke(jobj, method, ...)j_invoke_static(sc, class, method, ...)
j_invoke_new(sc, class, ...)
An R object acting as a Java object reference (typically, a spark_jobj).
The name of the method to be invoked.
Optional arguments, currently unused.
A spark_connection.
The name of the Java class whose methods should be invoked.