There's a list of compatibility issues between Java 7 & Java 8 here http://www.oracle.com/technetwork/java/javase/8-compatibility-guide-2156366. html
The main problem I would see in two system communicating while running different Java version is the way they handle serialization and de-serialization of objects which had been a problem in the past between some Java versions. AFAIK we're using JSON for that now, so if the code already compiles with Java8, it should not be a problem. On Mon, Feb 20, 2017 at 10:36 PM, Wei ZHOU <ustcweiz...@gmail.com> wrote: > We tested 4.7.1+systemd patches as well, it also works fine. > > -Wei > > 2017-02-20 22:34 GMT+01:00 Wei ZHOU <ustcweiz...@gmail.com>: > > > @Will and @Syed, I build the packages of 4.9.2+systemd patches on ubuntu > > 16.04 (openjdk 8). > > Then install the packages to management server and kvm hosts (all are > > ubuntu 16.04 with openjdk8). > > The systemvm template is 4.6 with openjdk7. > > > > cpvm and ssvm work fine. > > > > As there is no java process in VR, so I did not check, VR should not be > > impacted. > > > > -Wei > > > > 2017-02-20 22:16 GMT+01:00 Pierre-Luc Dion <pd...@cloudops.com>: > > > >> That's quite interesting Chiradeep! > >> > >> so I could do something like this I guest: > >> > >> mvn clean install > >> > >> and then this one to build the systemvm.iso: > >> mvn -Psystemvm -source 1.7 -target 1.7 install > >> > >> > >> I'll give it a try! but for now, I'm worried about existing VR, they > must > >> continue to work while running on jdk7. newer VPC would be ok to run > with > >> jdk8. but we need to make sure while upgrading the management-server we > >> are not in the obligation to upgrade VR's. > >> > >> For sure it is required for strongswan + JDK8 to ugprade the VR, but a > >> existing VR should remain usable for port forwarding, vm creation and > >> such... > >> > >> I'll post my finding... > >> > >> Thanks ! > >> > >> > >> > >> On Mon, Feb 20, 2017 at 3:59 PM, Chiradeep Vittal <chirade...@gmail.com > > > >> wrote: > >> > >> > You can build the system vm with -source 1.7 -target 1.7 > >> > Also unless you are using Java8 features (lambda) the classfiles > >> produced > >> > by javac 8 should work in a 1.7 JVM > >> > > >> > Sent from my iPhone > >> > > >> > > On Feb 20, 2017, at 11:51 AM, Will Stevens <wstev...@cloudops.com> > >> > wrote: > >> > > > >> > > yes, that is what I was expecting. which is why I was asking about > >> Wei's > >> > > setup because he seems to have worked around that problem. Or he > has > >> a > >> > > custom SystemVM template running with both JDK7 and JDK8. > >> > > > >> > > *Will STEVENS* > >> > > Lead Developer > >> > > > >> > > <https://goo.gl/NYZ8KK> > >> > > > >> > >> On Mon, Feb 20, 2017 at 2:20 PM, Syed Ahmed <sah...@cloudops.com> > >> > wrote: > >> > >> > >> > >> The problem is that systemvm.iso is built with java 8 whereas java > on > >> > the > >> > >> VR is java 7 > >> > >>> On Mon, Feb 20, 2017 at 13:20 Will Stevens <wstev...@cloudops.com > > > >> > wrote: > >> > >>> > >> > >>> Did it work after resetting a VPC or when blowing away the SSVM or > >> > >> CPVM? I > >> > >>> would not expect the SSVM or the CPVM to come up if the management > >> > server > >> > >>> was built with JDK8 and the system vm template is only using JDK7. > >> Can > >> > >> you > >> > >>> confirm? > >> > >>> > >> > >>> *Will STEVENS* > >> > >>> Lead Developer > >> > >>> > >> > >>> <https://goo.gl/NYZ8KK> > >> > >>> > >> > >>>> On Mon, Feb 20, 2017 at 1:15 PM, Wei ZHOU <ustcweiz...@gmail.com > > > >> > wrote: > >> > >>>> > >> > >>>> We've tested management server 4.7.1 with ubuntu 16.04/openjdk8 > and > >> > >>>> systemvm 4.6 with debian7/openjdk7. > >> > >>>> The systemvms (ssvm, cpvm) work fine. > >> > >>>> > >> > >>>> I agree we need consider the openjdk upgrade in systemvm > template. > >> > >>>> > >> > >>>> -Wei > >> > >>>> > >> > >>>> 2017-02-20 18:15 GMT+01:00 Will Stevens <wstev...@cloudops.com>: > >> > >>>> > >> > >>>>> Regarding my question. Is it because of the version of Java that > >> the > >> > >>>>> systemvm.iso is built on? > >> > >>>>> > >> > >>>>> On Feb 20, 2017 11:58 AM, "Will Stevens" <wstev...@cloudops.com > > > >> > >>> wrote: > >> > >>>>> > >> > >>>>>> A question that is hidden in here is: > >> > >>>>>> - Why does the JDK version on the management server have to > match > >> > >> the > >> > >>>> JDK > >> > >>>>>> version of the System VM? > >> > >>>>>> > >> > >>>>>> *Will STEVENS* > >> > >>>>>> Lead Developer > >> > >>>>>> > >> > >>>>>> <https://goo.gl/NYZ8KK> > >> > >>>>>> > >> > >>>>>> On Mon, Feb 20, 2017 at 11:50 AM, Pierre-Luc Dion < > >> > >>> pd...@cloudops.com> > >> > >>>>>> wrote: > >> > >>>>>> > >> > >>>>>>> Hi, > >> > >>>>>>> > >> > >>>>>>> In the context of deployment of CloudStack with VPCs, > >> > >>>>>>> What will happen to a cloud when upgrading to 4.10 that now > use > >> > >>> jdk8? > >> > >>>>>>> > >> > >>>>>>> Does upgrading the management-server to 4.10 jdk8 and then > keep > >> > >> the > >> > >>>> old > >> > >>>>>>> VRs > >> > >>>>>>> run for a while that run on JDK7 will still work ? > >> > >>>>>>> > >> > >>>>>>> Because If we upgrade the management-server to jdk8, we need > to > >> > >> keep > >> > >>>> VR > >> > >>>>> to > >> > >>>>>>> work until they get upgraded but we can't force an upgrade of > VR > >> > >>> just > >> > >>>>>>> because the management-server is now using JDK8. > >> > >>>>>>> > >> > >>>>>>> Thanks, > >> > >>>>>>> > >> > >>>>>> > >> > >>>>>> > >> > >>>>> > >> > >>>> > >> > >>> > >> > >> > >> > > >> > > > > >
