Introduction

I just started playing around with Groovy (and have to say I'm really digging it) and tried to get SimpleJPA working with it. Mission accomplished. To make it work nicely, I've added a configuration parameter to SimpleJPA:

groovyBeans=true 

Which will ignore extra methods that Groovy adds to the beans. Then you have to give SimpleJPA the Groovy classpath so SimpleJPA can find the entities (which is easy as you'll see below). Here's some sample code:

OUR ENTITY:

@Entity 
class Book extends IdedTimestampedBase { 
  String title 
  String summary 
} 

That's all the code you need to make an Entity. Beautiful.

GROOVY SCRIPT USING THE ENTITY:

// get the libraries to scan for @Entity 
def urls = this.class.classLoader.rootLoader.getURLs() 
def libsToScan = [] as Set 
urls.each {libsToScan.add(it.getFile())} 
// create EntityManagerFactory 
def emf = new EntityManagerFactoryImpl("TEST-GROOVY", null, libsToScan) 
// get EntityMananger from factory 
def em = emf.createEntityManager() 
// persist a Book 
def book = new Book(title:"Some book title", summary:"summary of book") 
em.persist(book) 
// find the book 
def book2 = em.find(Book.class, book.id) 
println("got book: ${book2.title}")