Re: [mat-dev] IBM DTFJ Feature update will require Java 1.8

[Andrew Johnson <andrew_johnson@xxxxxxxxxx>]

Pete,

Currently we build on Hudson at Eclipse.org
with jdk1.8.0-latest
The build does run tests of MAT using
DTFJ so that should still work.

We currently build MAT against Eclipse
Mars - see parent/pom.xml, so as Mars has a 1.7 requirement then so does
MAT. We did put a version check into the configuration a few releases ago,
but I think this was just for Java 1.6, and if you point use Java 1.6 with
MAT the check passes, so it then fails with a strange error message.

See 427081: Create stand-alone MAT based
on Kepler (4.3)
https://bugs.eclipse.org/bugs/show_bug.cgi?id=427081#c7
https://bugs.eclipse.org/bugs/show_bug.cgi?id=427081#c8

for the settings which enforced the
1.6 check.

There was some work done on getting
MAT standalone to build using Neon.
496550: Enable building RCPs with Neon
https://bugs.eclipse.org/bugs/show_bug.cgi?id=496550

497129: SWTBot test failures with Eclipse
Neon in org.eclipse.mat.ui.rcp.tests.MemoryAnalyzerProductTest
https://bugs.eclipse.org/bugs/show_bug.cgi?id=497129

though bug 496550 has a comment: "Neon
puts a requirement on java 1.8, so I would probably leave the (MAT) 1.6
packages based on an older one."

See also this for details of problems
switching to Neon or Oxygen. This also changes the platform support - dropping
a few and adding others, e.g. Neon Solaris is 64-bit only due to a lack
of 32-bit Java 1.8 on Solaris. For Oxygen, Eclipse has dropped support
for the following Unix based platforms: AIX, Solaris, HP-UX and s390 (and
Linux PPC32),
https://dev.eclipse.org/mhonarc/lists/mat-dev/msg00493.html

If MAT is installed into Oxygen then
Oxygen already has a Java 1.8 requirement.

There is also this bug:
520963: Building MAT on older versions
of Eclipse such as 3.6/Helios
https://bugs.eclipse.org/bugs/show_bug.cgi?id=520963

Changing the DTFJ update site might
be possible for two versions, but would cause confusion and also MAT 1.7
now comes with a link to the current update site.

In conclusion:
1. I think the MAT builds will succeed
with the new version of DTFJ
2. We should have a Java version check
for 1.7 for MAT
3. Will there be a helpful error message
if running DTFJ and MAT under Java 1.7? 
4. We may need to update some project
pages / forums / wiki to explain about the Java 1.8 requirement for DTFJ
5. We should investigate further building
standalone MAT against Neon (or Oxygen), but check the download stats for
the effect on people of removing some platform support.


Andrew Johnson




From:      
 Pete Robbins <ROBBINS@xxxxxxxxxx>
To:      
 Memory Analyzer Dev
list <mat-dev@xxxxxxxxxxx>
Date:      
 31/08/2017 10:26
Subject:    
   [mat-dev] IBM
DTFJ Feature update will require Java 1.8
Sent by:    
   mat-dev-bounces@xxxxxxxxxxx

---

In the next few weeks we will be updating
the IBM DTFJ Feature with support for recent IBM SDKs. This has a requirement
to run on Java 1.8 (IBM or OpenJDK). 

Will this change break MAT builds? Do you build with 1.8 or 1.7? 

It may be possible to leave the current DTFJ Feature repo where it is and
create a parallel one for the update and document how to install the new
support. 

Any thoughts? 



Cheers, 

Peter G (Pete) Robbins
IBM Runtime Technologies

Phone: 44-1962-818667 E-mail: ROBBINS@xxxxxxxxxx IBM Monitoring and Diagnostic Tools: www.ibm.com/developerworks/java/jdk/tools/ Find me on:	Hursley Park Hursley, SO212JN United Kingdom

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Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number
741598. 
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6
3AU