To build the application you will need Maven.
Then execute the build command:
mvn clean package
This command will create two .jar files, one with the dependencies bundle in and the other with only the compiled code.
The current stage can be used with the syntax:
java -jar rest-api-generator.jar <fileOfAPI_JSON_Schema.json> <optionsJSON_String>
Example:
java -jar rest-api-generator.jar advanced.json "{\"APIName\":\"college\", \"DataBaseName\":\"collegeDB\"}"