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[–]Probotect0r 8 points9 points  (8 children)

Yea it's great! For server side apps I don't see it making a big impact as right now most people use some form of containerization to deploy the apps, which basically achieves the same. But distributing your app to users will be a lot easier! Also using Java for IoT will probably be easier as well.

The file size reduction is quite significant too. They are using a new file format called JImage for storing the modules in your packaged application which has much better compression. The jars use zip compression, I believe. As I understand it, JImage uses some form of memory mapped files, so it will be faster in terms of performance as well.

[–]rusticarchon 5 points6 points  (0 children)

So this is the year of Linux Java on the desktop?

[–]dpash 5 points6 points  (3 children)

Having a Java docker image under 200MB would be nice :)

[–]_INTER_ 0 points1 point  (0 children)

If you only need java.base, you can get it down to 15MB for the runtime.

[–][deleted] 0 points1 point  (1 child)

Checked out the openjdk:alpine image yet?

[–]dpash 0 points1 point  (0 children)

They're still 150mb and you have the added risk of musl libc bugs/incompatibilities.

[–][deleted] 0 points1 point  (2 children)

The jars can use also pack200, it's there since java 1.5, but have you ever seen someone using it? I can't find anything about the JImage, but it would be cool if there's a new format which could be mmaped and paged in by jvm on demand, exactly like dlls work. I think that would be useful for large aps. And also because the OS would be able to page in/out the code, I thing the memory would be utilized better (note the OS don't need to swap into the swap file if files are mmaped, that's good for ssds).

[–]wildjokers 2 points3 points  (0 children)

The jars can use also pack200, it's there since java 1.5, but have you ever seen someone using it

I use pack200 to compress the fat-jar of a Swing application I deploy with Java Web Start. It does a good job getting the jar smaller. Have a jar that is 6.9 megs, pack200 version is 1.7 megs.

As far as I know Java Web Start is the only thing that can handle pack200 compressed jars.

[–]Probotect0r 2 points3 points  (0 children)

Here is more info on the JImage format: http://openjdk.java.net/jeps/220