In Spring Roo when we enable our project for JPA using the following command:-

```
jpa setup --provider DATANUCLEUS --database 

```

Then I found that there is no option for MongoDB after --database option.So i want to know how can I do it.

I am thinking to create a JPA setup for MySql and then make changes in the generated persistence.xml for MongoDB cause at the end even ROO is a java project.But I don't know whether its the correct approach.

I would appreciate any assistance in doing this.Any link or example will be great.