New candidate JEP: 336: Deprecate the Pack200 Tools and API

Peter Firmstone peter.firmstone at
Wed Jun 13 10:17:59 UTC 2018

Hi Daniel,

I had a look at the pack200 code in openjdk, it's written in c++, and 
looks a little painful to maintain.  I also had a look at Apache 
Harmony's implementation, written in Java, it uses the ASM byte code 
library and it's also already an OSGi Bundle.  It's still only at 
bytecode version 1.6, but it's going to be a lot easier to maintain in 
the long term.



On 13/06/2018 6:50 AM, Daniel Megert wrote:
> pack200 is used by the Eclipse update manager a.k.a. p2. The JARed
> plug-ins are compressed with pack200 and put into a p2 repository.
> Removing pack200 will make the download (and hence install) of plug-ins
> much slower. Eclipse would therefore like to keep this technology. If
> that's not an option, then we would like that the removal does not happen
> before Java 13.
> Dani
> Eclipse PMC

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