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What to tell in a talk about JPA

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  What to tell in a talk about JPA Cecil Westerhof <Cecil@decebal.nl> - 2015-11-13 11:14 +0100
    Re: What to tell in a talk about JPA Arne Vajhøj <arne@vajhoej.dk> - 2015-11-13 21:49 -0500
    Re: What to tell in a talk about JPA Lew <lewbloch@gmail.com> - 2015-11-16 14:42 -0800

#33119 — What to tell in a talk about JPA

I am in the middle of migrating a series of applications. One thing is
that JDBC has to be replaced with JPA. I am going to give a
presentation about this on T-DOSE. (The biggest Open Source event in
the Netherlands.) This was/is my first time that I work with JPA. So I
am far from being an expert. What are things that are useful to
mention? The talk is three quarters of an hour and beside JPA I will
also talk about the pitfalls we experienced during the migration.

-- 
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof

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#33128

On 11/13/2015 5:14 AM, Cecil Westerhof wrote:
> I am in the middle of migrating a series of applications. One thing is
> that JDBC has to be replaced with JPA. I am going to give a
> presentation about this on T-DOSE. (The biggest Open Source event in
> the Netherlands.) This was/is my first time that I work with JPA. So I
> am far from being an expert. What are things that are useful to
> mention? The talk is three quarters of an hour and beside JPA I will
> also talk about the pitfalls we experienced during the migration.

I think that:
* showing DAL KLOC before and DAL KLOC after
* showing some examples of old SQL and new generated SQL
would interest those seriously interested in the business case.

Arne

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#33136

On Friday, November 13, 2015 at 2:47:03 AM UTC-8, Cecil Westerhof wrote:
> I am in the middle of migrating a series of applications. One thing is
> that JDBC has to be replaced with JPA. I am going to give a
> presentation about this on T-DOSE. (The biggest Open Source event in
> the Netherlands.) This was/is my first time that I work with JPA. So I
> am far from being an expert. What are things that are useful to
> mention? The talk is three quarters of an hour and beside JPA I will
> also talk about the pitfalls we experienced during the migration.

The main thing is that JPA is NOT A DATA-MANIPULATION TECHNIQUE. It is an object-manipulation technique. The single biggest mistake is to use JPA as a wrapper for SQL rather than a persistence mechanism for objects.

The second mistake is to keep a 'DataManager' around too long. They should be ephemeral.

-- 
Lew

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