anchor.diff:  [cdbookstore]$ jpa-setup --provider Eclipse Link --dbType POSTGRES --dataSourceName java:comp/DefaultDataSource
   ----
   
  -Then, let's create a few fields. Again, one single command end Forge will do its best to simplify our lives :
  +If you have executed the `jpa-setup` command, you've noticed that the prompt has changed: you went from `[cdbookstore]` to `[persistence.xml]`. In Forge, the prompt always tells you where you are. You can even enter the command `pwd` or `ls`. For now, let's go back into the `Book` entity: enter `cd~~` brings you to the root directory, and then `cd src/main/java/org/cdbookstore/model/Book.java`. 
  +
  +So, let's create a few fields in the `Book` entity. Again, one single command end Forge will do its best to simplify our lives :
   
   [source, console]
   ----
  
positive.code: [Book.java]$ jpa-new-field --named description --length 2000
  [Book.java]$ jpa-new-field --named price --type java.lang.Float
  [Book.java]$ jpa-new-field --named nbOfPages --type java.lang.Integer
  [Book.java]$ jpa-new-field --named publicationDate --typeName java.util.Date --temporalType DATE
  ----
  
  As you can see, Forge has a all set of parameters to quickly create attributes and customize their JPA mapping. Now let's say we want to specify that a book is written in a certain language. We can use Forge to quickly create a Java enum and then have it as a JPA Enumerated in the `Book` entity :
  
negative.code: 
  [source, console]
  ----
  [model]$ cd ../rest/BookEndpoint.java
  [BookEndpoint.java]$ ls
  
  [fields]
  