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From Dan Haywood <>
Subject Re: Few questions
Date Thu, 12 Dec 2013 18:58:13 GMT
On 12 December 2013 18:34, Satyendra Singh <>wrote:

> I have few questions on ISIS usage.
> 1)      I am assuming one has to learn JDO and its DataNucleus
> implementation to be able to use it, right?

Practically speaking, yes.

In theory, Isis does support multiple object store implementations.  To
date, the only ones released as the JDO/DataNucleus objectstore and - for
prototyping onlt - the in-memory objectstore.

I would recommend using JDO OS throughout, even for prototyping, though.
 There are subtle differences between the implementations, for example the
way in which bidirectional relationships are (with the appropriate JDO
annotations) automatically managed by the JDO OS.

> 2)      I am looking for a plain set of instructions, 'step by step' kind
> of, to be able to build a simple application myself, but so far I have not
> found any. There is a lot of information out there on various concepts but
> they don't give you a simplified picture on 'n' things you need to do to be
> able to bring up a domain object to screen using ISIS and than I could go
> learning each step in detail, if required.
One resource I can point you to is a github repo [1] I put together for a
conference talk [2].  I don't know how good the talk was, but the tags in
that repo (22 of em) should give you a good idea of how an Isis app can be
built up.

> 3)      For a real word application, I need to be able to implement using
> a domain object that has one-to-one, one-to-many, many-to-one relationship
> with other domain object(s), is there any sample application that I can use
> as starting point for this.
Yes, there's [1] as mentioned, you can also take a look at Estatio [3],
which is the app that Jeroen (one of the other Isis committers) and I have
been working on.

> 4)      Is  it possible to replace JDO with JPA as JPA skill is more
> easily available that JDO ?

Not currently.  DataNucleus does support the JPA API, so this is certainly
do-able; but it's not a priority at the moment.

Oscar - one of our other committers - might also want to say something; he
came to Isis from a JPA standpoint also.

> Thank you very much
> Satyendra
You're welcome - any more questions, just ask.



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