No there isn't any issue except having the bugs & fixes of the JDK you're using. You can compile it with a JDK 1.8 as long as you don't change the target bytecode version for 1.7
On Tue, Feb 21, 2017 at 8:15 AM, Wei ZHOU <ustcweiz...@gmail.com> wrote: > Marco, > > Good point. Is there any issue if we compile code with jdk8 but run it on > jdk7 (systemvm) ? > > -Wei > > 2017-02-21 7:43 GMT+01:00 Marc-Aurèle Brothier <ma...@exoscale.ch>: > > > 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, > > > >> > >>>>>>> > > > >> > >>>>>> > > > >> > >>>>>> > > > >> > >>>>> > > > >> > >>>> > > > >> > >>> > > > >> > >> > > > >> > > > > >> > > > > > > > > > > > > > >
