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Updating the installation's embedded JRE [message #1829664]

Wed, 08 July 2020 12:07

Jan Poganski

Messages: 6
Registered: March 2011

Junior Member

First of all I would like to say "Thanks, Ed" for JustJ because it comes with good news which I found your recent blog post: "the ability to update the installation's embedded JRE as new ones are released."
(sorry I cannot share the link because links to external sites are not permitted for me as a first time forum user)

While offering a customized version of Eclipse I had no luck providing a new JRE via p2. I remember the discussion in this bug that has been marked with CLOSED WONTFIX after almost ten years:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=300812

That's why I am looking forward to following the instructions about "Building Products that Use JustJ JREs" at https://www.eclipse.org/justj/?page=documentation. (By the way, it includes a link to https://www.eclipse.org/forums/index.php/t/1104206 which seems to be unrelated.)

While studying the comments to your blog post I found some advice about " touch points to alter the eclipse.ini file to point to the appropriate target VM when installing/uninstalling the feature".

It feels like the information how to prepare for updating the installation's embedded JRE can only be found inside bug reports, forums or mailing lists. Can you recommend some place where to find most helpful instructions or even an example?

[Updated on: Mon, 13 July 2020 15:24]

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Re: Updating the installation's embedded JRE [message #1829670 is a reply to message #1829664]

Wed, 08 July 2020 13:30

Jan Poganski

Messages: 6
Registered: March 2011

Junior Member

This is the link to the mentioned blog post:
https://ed-merks.blogspot.com/2020/06/eclipse-justj.html

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Re: Updating the installation's embedded JRE [message #1829676 is a reply to message #1829670]

Wed, 08 July 2020 14:45

Ed Merks

Messages: 33133
Registered: July 2009

Senior Member

Thanks for the comment on the broken link, apparently a trailing slash is needed to link to the correct thread. I've fixed it in the documentation.

This wiki page is useful for how to specify things like touchpoints in an installable unit:

https://wiki.eclipse.org/Equinox/p2/Customizing_Metadata#Touchpoint_Instruction_Advice:

You'll see a setjvm touchpoint in, for example, this p2.inf:

https://ci.eclipse.org/justj/job/build-jres/lastSuccessfulBuild/artifact/jre-gen/plugins/org.eclipse.justj.openjdk.hotspot.jre.full.win32.x86_64/META-INF/p2.inf/*view*/

Of course if you use the JustJ JREs, you don't need to do anything with regards to touchpoints. Those are present and are applied automatically.

Are you trying to follow the instructions but are stuck on some finer point?

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: Updating the installation's embedded JRE [message #1829901 is a reply to message #1829676]

Mon, 13 July 2020 15:24

Jan Poganski

Messages: 6
Registered: March 2011

Junior Member

It sounds good that with the justj JREs I do not need to care about the touchpoints :-)
Before I can really try that I need to modernize my old Ant based build scripts (PDE build) or replace them with a Tycho based approach. Unfortunately the old scripts do not work anymore with the latest Eclipse version.
As the mentioned section of the justj documentation refers to Tycho I assume this is the way to go.

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Re: Updating the installation's embedded JRE [message #1829906 is a reply to message #1829901]

Mon, 13 July 2020 17:00

Ed Merks

Messages: 33133
Registered: July 2009

Senior Member

Definitely Maven in combination with Tycho is the way to do modern builds. I had to convert EMF's build from Buckminster to Tycho, which I kind of resented, but it was well worth it in the end and for the long term...

I do consulting if you need professional help. :-P

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: Updating the installation's embedded JRE [message #1836756 is a reply to message #1829906]

Wed, 13 January 2021 11:22

Jan Poganski

Messages: 6
Registered: March 2011

Junior Member

After migrating from PDE Build to Tycho I can now confirm that JustJ definitely allowed me to nicely ship a JRE 14 with a custom Eclipse product and then provide a JRE 15 as part of a product update via p2. I was thrilled to see Eclipse switching its JRE when restarting after the update had been installed. JustJ is such an elegant solution to the problem discussed for ten year in that bug (to which I added a comment pointing to JustJ): https://bugs.eclipse.org/bugs/show_bug.cgi?id=300812
Thank you so much, Ed. I hope that many other will start enjoying these benefits of JustJ.

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Re: Updating the installation's embedded JRE [message #1836768 is a reply to message #1836756]

Wed, 13 January 2021 14:39

Ed Merks

Messages: 33133
Registered: July 2009

Senior Member

Thanks for the kind words and for sharing your experience both here and in Bugzilla!

Ed Merks
Professional Support: https://www.macromodeling.com/

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