[wtp-dev] FW: [eclipse.org-planning-council] Re: EMF usage in TPTP 4.4.0

["Tim Wagner" <twagner@xxxxxxx>]

FYI - info on EMF's impact to JRE version requirements in Europa.

-----Original Message-----
From: eclipse.org-planning-council-bounces@xxxxxxxxxxx
[mailto:eclipse.org-planning-council-bounces@xxxxxxxxxxx] On Behalf Of
Marcelo Paternostro
Sent: Sunday, January 07, 2007 10:39 PM
To: eclipse.org-planning-council
Cc: TPTP PMC communications (including coordination, announcements,and
Group discussions); Cross project issues;
eclipse.org-planning-council-bounces@xxxxxxxxxxx;
eclipse.org-planning-council
Subject: [eclipse.org-planning-council] Re: EMF usage in TPTP 4.4.0

I believe I am reading some misleading information on this thread.  Just
to
make sure we are all on the same page, I will try to summarize the
technical details that I think are relevant here.

- A code compiled with Java 1.4 runs on Java 5 without any problem.

- A code compiled with Java 5 does not run with Java 1.4.  Even
'HelloWorld.java' has such "limitation".

- A bundle that has its environment set to require Java 5 is not
activated
when Eclipse is executed with Java 1.4.

- EMF 2.3.0 is compiled with Java 5 and all its bundles require Java 5.

- EMF 2.3.0 cannot be compiled with Java 1.4 due to the extensive use of
Java 5.0 features.

- EMF 2.3.0 is binary compatible with our latest release (EMF 2.2.1).
Besides our own tests, we heard this from developers of Eclipse projects
and commercial products.  This means that adopting EMF 2.3.0 is not a
problem as long as the code is not recompiled.  We also verified that
EMF
2.3.0 does not break anything if the source compatibility of projects
are
set to Java 1.4,

- EMF 2.3.0 can generate code targeting both Java 1.4 and Java 5.


Putting it together:

- EMF 2.3.0 and its dependencies are not available if Java 1.4 is used.

- If a bundle is compiled with Java 1.4 or with source compatibility set
to
Java 1.4, it will run without any problems with EMF 2.3.0 and Java 5.

- To run your code with Java 1.4, you will need a previous version of
EMF.
Our latest release is 2.2.1 (available in Callisto) and we are currently
fixing important bugs on the 2.2.2 maintenance stream.


Hopefully this will make it easier to understand the impacts of EMF
2.3.0
on Europa.

Best regards,

Marcelo Paternostro
IBM Toronto Lab
marcelop@xxxxxxxxxx

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