Re: [eclipselink-users] Using constructor injection with JPA entities

[James Sutherland <jamesssss@xxxxxxxxx>]

I think that the default constructor you provide JPA can be marked private,
so would be ok.  If a private constructor does not work in EclipseLink,
please log a bug.  EclipseLink also has support for an InstantiationPolicy
that can use a private static method, or factory.


cowwoc wrote:
> 
> But you cannot use constructor injection in JPA 1.0, it still forces you
> to provide a default constructor.
> 
> Gili
> 
> 
> James Sutherland wrote:
>> 
>> JPA 1.0 supports field access, so you do not need set methods if you use
>> field access, which is normally the better way to go anyway.
>> 
>> 
>> cowwoc wrote:
>>> 
>>> Hi,
>>> 
>>> I am curious whether it conceivably possible for JPA 2.0 to add support
>>> for constructor injection for such things as read-only entities. I'm not
>>> a fan of the JavaBean design pattern and I'm wondering whether it would
>>> be possible to move EclipseLink and JPA closer to the Guice way of doing
>>> things. For example:
>>> 
>>> class Foo
>>> {
>>>   public Foo(@Named("username") String username, @Named("password")
>>> String password)
>>>   {}
>>> 
>>>   // mapping annotations go on getters
>>>   public String getUsername() {}
>>>   public String getPassword() {}
>>> 
>>>   // no setters
>>> }
>>> 
>>> It would be even better if you could pick up the property names directly
>>> from the variable name but I believe there are technical problems with
>>> that approach.
>>> 
>>> Thank you,
>>> Gili
>>> 
>> 
>> 
> 
> 


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