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Re: From Hibernate to straight JPA

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On 07/18/2015 03:48 PM, Eternal Hope wrote:
> On 10/07/2015 19:13, Cecil Westerhof wrote:
>> We are asked to change some software. At the moment one of the things
>> that has to be replaced is Hibernate. They want to use straight JPA,
>> so it is easy to switch from Hibernate, to openJPA, to …
>>
>> One of the annotations that is used is:
>>      @NotEmpty(message = "Field is not filled")
>> with the import:
>>      import org.hibernate.validator.constraints.NotEmpty;
>>
>> My college wants to use:
>>      @NotNull(message = "Field is not filled")
>>      @Size(message = "Field is not filled", min = 1)
>>
>> I do not like this. It certainly is not DRY. (It is used hundreds of
>> times.) I prefer to define our own NotEmpty. But I have never worked
>> with annotations. How to do this?
>>
>> Also what is a good resource to learn about JPA and annotations?
>
> As I read this thread I thought it was about time I had a look at this
> JPA stuff. I've been writing Java for circa 15 years now, I've done
> everything from writing byte streams to firmware interfaces to high
> availability container managed business applications and Swing based
> UIs. In all this time I have relied on a JDBC driver in my classpath,
> container managed connection pools, hand coded SQL and 'in code'
> transaction management. I do my own OR mapping; actually we don't call
> it 'OR mapping' it's just relational database stuff, and quite frankly
> I've never found the need to use some persistance framework.
>
> I just had a look at
> http://openjpa.apache.org/builds/2.4.0/apidocs/index.html
>
> Good grief ... HOW many classes. WTF

Here is a much smaller API.
<https://docs.oracle.com/javaee/7/api/javax/persistence/package-summary.html>

>
> Seriously, how much of this stuff do people actually use.
> What is the learning overhead of just this one API
> It gives me a headache just scrolling down the class list.
> What is the actual payback for the time spent getting your head around
> even a fraction of this API
>
> This is not a trivial question AFAIAC I genuinely can't see the benefit,
> particularly in the short term of learning this stuff. There will always
> be another framework, I could spend my entire life learning frameworks
> all the time getting further and further away from the core language.
>
> I'd be genuinely interested in any non-confrontational opinions.
>
> Thanks
>

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From Hibernate to straight JPA Cecil Westerhof <Cecil@decebal.nl> - 2015-07-10 20:13 +0200
  Re: From Hibernate to straight JPA Jeff Higgins <jeff@invalid.invalid> - 2015-07-11 10:56 -0400
    Re: From Hibernate to straight JPA Cecil Westerhof <Cecil@decebal.nl> - 2015-07-11 21:06 +0200
  Re: From Hibernate to straight JPA Lew <lewbloch@gmail.com> - 2015-07-16 17:15 -0700
    Re: From Hibernate to straight JPA Arne Vajhøj <arne@vajhoej.dk> - 2015-07-16 20:44 -0400
      Re: From Hibernate to straight JPA Cecil Westerhof <Cecil@decebal.nl> - 2015-07-17 10:01 +0200
        Re: From Hibernate to straight JPA Arne Vajhøj <arne@vajhoej.dk> - 2015-07-27 22:18 -0400
  Re: From Hibernate to straight JPA Eternal Hope <laughingspam99@gmail.com> - 2015-07-18 20:48 +0100
    Re: From Hibernate to straight JPA Jeff Higgins <jeff@invalid.invalid> - 2015-07-18 16:51 -0400
    Re: From Hibernate to straight JPA Arne Vajhøj <arne@vajhoej.dk> - 2015-07-18 17:21 -0400
    Re: From Hibernate to straight JPA Martin Gregorie <martin@address-in-sig.invalid> - 2015-07-18 23:24 +0000
      Re: From Hibernate to straight JPA Arne Vajhøj <arne@vajhoej.dk> - 2015-07-18 19:43 -0400
      Re: From Hibernate to straight JPA Jeff Higgins <jeff@invalid.invalid> - 2015-07-18 19:50 -0400
        Re: From Hibernate to straight JPA Arne Vajhøj <arne@vajhoej.dk> - 2015-07-18 20:23 -0400
      Re: From Hibernate to straight JPA Eternal Hope <laughingspam99@gmail.com> - 2015-07-19 09:22 +0100
        Re: From Hibernate to straight JPA Jeff Higgins <jeff@invalid.invalid> - 2015-07-19 06:20 -0400
          Re: From Hibernate to straight JPA Jeff Higgins <jeff@invalid.invalid> - 2015-07-19 07:49 -0400
            Re: From Hibernate to straight JPA Eternal Hope <laughingspam99@gmail.com> - 2015-07-19 13:28 +0100
              Re: From Hibernate to straight JPA Jeff Higgins <jeff@invalid.invalid> - 2015-07-19 09:20 -0400
                Re: From Hibernate to straight JPA Jeff Higgins <jeff@invalid.invalid> - 2015-07-19 09:50 -0400
              Re: From Hibernate to straight JPA Jeff Higgins <jeff@invalid.invalid> - 2015-07-20 13:16 -0400
                Re: From Hibernate to straight JPA Jeff Higgins <jeff@invalid.invalid> - 2015-07-20 13:42 -0400
                Re: From Hibernate to straight JPA Jeff Higgins <jeff@invalid.invalid> - 2015-07-20 14:07 -0400
                Re: From Hibernate to straight JPA Eternal Hope <laughingspam99@gmail.com> - 2015-07-20 20:46 +0100
                Re: From Hibernate to straight JPA Martin Gregorie <martin@address-in-sig.invalid> - 2015-07-20 21:01 +0000
                Re: From Hibernate to straight JPA Jeff Higgins <jeff@invalid.invalid> - 2015-07-20 22:19 -0400
                Re: From Hibernate to straight JPA Jeff Higgins <jeff@invalid.invalid> - 2015-07-20 23:52 -0400
                Re: From Hibernate to straight JPA Joerg Meier <joergmmeier@arcor.de> - 2015-07-21 12:04 +0200
                Re: From Hibernate to straight JPA Eternal Hope <laughingspam99@gmail.com> - 2015-07-21 12:43 +0100
    Re: From Hibernate to straight JPA Jeff Higgins <jeff@invalid.invalid> - 2015-07-18 20:25 -0400
      Re: From Hibernate to straight JPA Jeff Higgins <jeff@invalid.invalid> - 2015-07-18 20:44 -0400

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