So I tried a few options:

java -cp .;reverse-engineering-1_6_9.jar; C:\Oracle\datamodeler4.1P\datamodeler\jdbc\lib\ojdbc6.jar com.vertabelo.reverse.Main -url jdbc:oracle:thin:@//localhost:1521/xe -user dv -password xx -o dv_demo

Error: Could not find or load main class

So I copied ojdbc6.jar to my Verabelo directory

java -cp .;reverse-engineering-1_6_9.jar; ojdbc6.jar com.vertabelo.reverse.Main -url jdbc:oracle:thin:@//localhost:1521/xe -user dv -password dv -o dv_demo

Same error: Could not find or load main class

Is there anyway to import DDL create scripts to Vertabelo, rather than from the database?