More compact @PersistenceCapable declarations

When I started writing I said I was going to treat JDO and JPA equally in these posts, but I've just learned something so earth-shatteringly helpful that happens to be specific to JDO. What would you have me do? Should I withhold valuable information just because it doesn't have a corresponding representation in JPA? That hardly seems right. How about a compromise: I'm going to share the JDO nugget and I promise to make it up to the JPA users at some point in the future. Sound reasonable? We have a deal? Ok, good. Now hold on to your hats, here we go:

I've always written PersistenceCapable declarations like this:

@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Foo {
    @PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
    private Key key;
    // ...
}

Kinda verbose, right? It turns out that if you omit 'identityType' DataNucleus will still do the right thing so long as you've set your PrimaryKey up properly:

@PersistenceCapable
public class Foo {
    @PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
    private Key key;
    // ...
}

I just saved you 41 characters. Happy new year everyone!