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From John Burwell <john.burw...@shapeblue.com>
Subject Re: [DISCUSS] Moving to Java 8
Date Thu, 16 Jul 2015 15:58:28 GMT
Wido,

We have an acute problem — Oracle will be issuing no further security patches for Java7
which is a significant opsec risk.  Put simply, we can’t leave our users exposed to such
a risk because Ubuntu won’t ship a release for an non-EOL’ed Java version for another
year.  Personally, I think it is a tremendous oversight that Java7 has been EOL’ed for over
three (3) months [1], and we have not addressed the issue for our users.  CloudStack should
have officially supported Java8 before Java7 reached EOL.

To minimize the impact of the change and smooth the transition, I suggest continuing to build
with source and runtime compatibility set to 1.7 and test builds on both Java7 and Java8 until
CloudStack 5.  This approach will allow users to gradually transition from Java7 to Java8
with support for Java7 being eliminated at the next major release.

Thanks,
-John

[1]: http://www.oracle.com/technetwork/java/eol-135779.html

---
John Burwell (@john_burwell)
VP of Software Engineering, ShapeBlue
(571) 403-2411 | +44 20 3603 0542
http://www.shapeblue.com
Please join us at CloudStack Collab EU — http://events.linuxfoundation.org/events/cloudstack-collaboration-conference-europe




> On Jul 15, 2015, at 7:57 AM, Wido den Hollander <wido@widodh.nl> wrote:
>
> Signed PGP part
>
>
> On 15-07-15 09:20, Wilder Rodrigues wrote:
> > If there would be dependencies on some other things, that in no way
> > could be fixed now, we could wait for 4.7 (5.0). However, if we
> > could give it a go, I would be able to tackle this in our next
> > Sprint (within 1 1/2 week from now) and still get it into 4.6.
> >
> > What would be the main considerations?
> >
>
> Well, on Ubuntu systems we simply we will require a additional
> software repo. The good thing is that OpenJDK 8 is available for 12.04
> and 14.04
>
> I don't feel like we should do something like this in a 4.X release,
> but that's me.
>
> Wido
>
> > Cheers, Wilder
> >
> >
> > On 14 Jul 2015, at 22:25, Wido den Hollander
> > <wido@widodh.nl<mailto:wido@widodh.nl>> wrote:
> >
> >
> >
> > On 07/14/2015 10:18 PM, John Burwell wrote: Wido,
> >
> > Is the OpenJDK PPA [1] not acceptable?  Since Java7 is no longer
> > supported, we run the risk of an Java security issue affecting the
> > project that won’t be fixed.
> >
> >
> > I didn't know that a PPA with OpenJDk existed. Looking at it I see
> > that the maintainer Matthias Klose works for Canonical, so it
> > seems like an official PPA.
> >
> > Still, having users adding PPAs is something we want to prevent as
> > much as possible, but I do recognize the problem here.
> >
> > Ubuntu 16.04 is less then a year away and will have Java 8 support,
> > so that will be resolved by then, but for now it is a problem.
> >
> > I think that CloudStack 4.6 is to early, but maybe 4.7 (called
> > 5.0?) is a good time to make the move?
> >
> > Wido
> >
> > Thanks, -John
> >
> > [1]: https://launchpad.net/~openjdk-r/+archive/ubuntu/ppa
> >
> > --- John Burwell (@john_burwell) VP of Software Engineering,
> > ShapeBlue (571) 403-2411 | +44 20 3603 0542
> > http://www.shapeblue.com Please join us at CloudStack Collab EU —
> > http://events.linuxfoundation.org/events/cloudstack-collaboration-conf
> >
> >
> erence-europe
> >
> >
> >
> >
> >
> > On Jul 10, 2015, at 5:47 PM, Wido den Hollander
> > <wido@widodh.nl<mailto:wido@widodh.nl>> wrote:
> >
> > Signed PGP part
> >
> >
> > On 07/10/2015 09:22 PM, Rohit Yadav wrote: Ping Wilder - any
> > progress/plan on moving forward (perhaps after 4.6?).
> >
> >
> > I don't think there is? Since Ubuntu 14.04 doesn't support Java 8
> > in any package form we can't really continue.
> >
> > Ubuntu 16.04 will ship with Java 8 and that will be the next LTS.
> >
> > Wido
> >
> > On 01-May-2015, at 4:07 pm, Wilder Rodrigues
> > <WRodrigues@schubergphilis.com<mailto:WRodrigues@schubergphilis.com><m
> ailto:WRodrigues@schubergphilis.com>
> >
> >
> >
> >
> > wrote:
> >
> > Hi Marcus,
> >
> > Sorry for the push, I think after doing the whole
> > CitrixResourceBase refactor I also got a bit attached to the whole
> > thing/solution. ;)
> >
> > Thanks for the input you gave. I will finish the refactor and apply
> > it to both implementations.
> >
> > Cheers, Wilder
> >
> >
> > On 01 May 2015, at 09:06, Marcus
> > <shadowsor@gmail.com<mailto:shadowsor@gmail.com><mailto:shadowsor@gmai
> l.com><mailto:shadowsor@gm
> >
> >
> ai
> >
> >
> > l.com<http://l.com>>> wrote:
> >
> > Oh, and of course the annotation added to the wrapper looks like:
> >
> >
> > ...
> >
> > @ResourceWrapper(handles =  CheckHealthCommand.class)
> >
> > public final class LibvirtCheckHealthCommandWrapper
> >
> > ...
> >
> >
> > maybe 'wraps' or 'wrapperfor' would be better than 'handles' in
> > your naming scheme. You get the idea.
> >
> > On Thu, Apr 30, 2015 at 11:59 PM, Marcus
> > <shadowsor@gmail.com<mailto:shadowsor@gmail.com><mailto:shadowsor@gmai
> l.com>>
> > wrote: I agree, this wrapper is a good step forward. It's totally
> > fine to continue on that path because it is obviously better and
> > makes it easy to switch to autodetection anytime later by simply
> > adding the annotation. Sorry if I got a bit passionate about that,
> > but as you mention I also get tired of adding things in multiple
> > places, and the annotations have worked well in the API and provide
> > a good model to emulate for consistency.
> >
> > I can't share code, because these extensions to
> > LibvirtComputingResource that I've provided for other companies
> > have not been open sourced. I can speak more generically though
> > about methods.
> >
> > To answer question "a", reflection allows you to do something
> > like:
> >
> > Reflections reflections = new
> > Reflections("com.cloud.hypervisor.kvm.resource.wrapper");
> > Set<Class<? extends CommandWrapper>> wrappers =
> > reflections.getSubTypesOf(CommandWrapper.class);
> >
> > So here in "new Reflections" we are automatically filtering for
> > just the wrappers that would apply to the KVM plugin. Then to
> > finish it off, you iterate through the wrappers and do:
> >
> > ResourceWrapper annotation =
> > wrapper.getAnnotation(ResourceWrapper.class);
> > citrixCommands.put(annotation.handles(), wrapper.newInstance());
> >
> > Sorry, I guess that's four lines, plus the relevant for loop. And
> > probably a null check or something for the annotation. You also
> > have to add the annotation class itself, and add a line for the
> > annotation in each wrapper, but in the end when we add new
> > Commands, we won't have to touch anything but the new class that
> > handles the command.
> >
> >
> > public @interface ResourceWrapper {
> >
> > Class<? extends Command> handles();
> >
> > }
> >
> > There's an example of something similar to this in
> > KVMStoragePoolManager.java (annotation is StoragePoolInfo.java).
> > This example has actually been adapted from that. Also to a lesser
> > extent in the API server, but it is spread across a bunch of
> > classes.
> >
> > On Thu, Apr 30, 2015 at 10:41 PM, Wilder Rodrigues
> > <WRodrigues@schubergphilis.com<mailto:WRodrigues@schubergphilis.com><m
> ailto:WRodrigues@schubergphilis.com>
> >
> >
> >
> >
> > wrote: Hi Marcus,
> >
> > Thanks for the email… I’m always in for improvements. But why can’t
> > you share the code?
> >
> > Few points below:
> >
> > 1. I added an subclassing example of LibvirtComputingResource
> > because you mentioned it in a previous email:
> >
> > On 23 Apr 2015, at 17:26, Marcus
> > <shadowsor@gmail.com<mailto:shadowsor@gmail.com><mailto:shadowsor@gmai
> l.com>>
> > wrote:
> >
> > I mentioned the reflection model because that's how I tend to
> > handle the commands when subclassing LibvirtComputingResource.
> >
> > 2. Current situation with LibvirtComputingResource on Master is:
> >
> > a. 67 IFs b. 67 private/protected methods that are used only there
> > c. If a new Command is added it means we will have a new IF and a
> > new private method e. Maintenance is hell, test is close to zero
> > and code quality is below expectations
> >
> > That being said, the main idea with the refactor is to change
> > structure only, not behaviour. So what I’m doing is to simply move
> > the code out the LibvirtCompRes and write tests for it, keeping the
> > behaviour the same - to be done in a next phase. If you look at the
> > changes you will see that some wrappers are already 100% covered.
> > However, some others have 4% or 8% (not that much though). I would
> > like to refactor that as well, but that could change behaviour
> > (mentioned above) which I don’t want to touch now.
> >
> > 3. With the new situation:
> >
> > a. No IFs b. All methods wrapped by other classes (command
> > wrappers) - loosely coupled, easier to test and maintain c. If a
> > new Command is added we would have to add a command wrapper and 1
> > line in the request wrapper implementation ( I know, it hurts you a
> > bit) - but please bear with me for the good news.
> >
> > 4. the warnings are due to that: Hashtable<Class<? extends
> > Command>, CommandWrapper>()
> >
> > No big deal.
> >
> > As I understood from  your first paragraph we would have to
> > annotated the commands classes, right? I mean, all of them.
> >
> > That’s something I wouldn’t do in this phase, to be honest. It
> > might seem harmless to do, but I like to break things down a bit
> > and have more isolation in my changes.
> >
> > What’s next: I will finish the refactor with the request wrapper as
> > it is. For me it is no problem do add the lines now and remove them
> > in 1 week. Most of the work is concentrated in the tests, which I’m
> > trying as hard as I can to get them in the best way possible. Once
> > it’s done and pushed to master, I will analyse what we would need
> > to apply the annotation.
> >
> > But before I go to bring the kids to school, just one question:
> >
> > a. The “handle” value, in the annotation, would have the wrapper
> > class that would be used for that command, right?  Now let’s get 1
> > command as example: CheckHealthCommand. Its wrapper implementation
> > differs per hypervisor (just like all the other wrapper commands
> > do). I’m not taking the time to really think about it now, but how
> > would we annotated the different wrappers per command?
> >
> > Thanks again for your time.
> >
> > Cheers, Wilder
> >
> >
> > On 30 Apr 2015, at 22:52, Marcus
> > <shadowsor@gmail.com<mailto:shadowsor@gmail.com><mailto:shadowsor@gmai
> l.com>>
> > wrote:
> >
> > Ok. I wish I could share some code, because it isn't really as big
> > of a deal as it sounds from your reasoning. It is literally just 3
> > lines on startup that fetch anything with the '@AgentExecutor'
> > annotation and stores it in a hash whose key is the value from
> > @AgentExecutor's 'handles' property. Then when a *Command comes it
> > it is passed to the appropriate Executor class.
> >
> > Looking at CitrixRequestWrapper, the 3 lines I mention are almost
> > identical in function to your init method, just that it uses the
> > annotation to find all of the commands, rather than hardcoding
> > them. We use the same annotation design for the api side of the
> > code on the management server, which allows the api commands to be
> > easier to write and self-contained (you don't have to update other
> > code to add a new api call). It makes things easier for novice
> > developers.
> >
> > This implementation is no less typesafe than the previous design
> > (the one with all of the instanceof). It didn't require any casting
> > or warning suppression, either, as the wrapper does.
> >
> > Extending LibvirtComputingResource is not ideal, and doesn't work
> > if multiple third parties are involved. Granted, there hasn't been
> > a lot of demand for this, nevertheless it's particularly important
> > for KVM, where the Command classes are executed on the hypervisor
> > it's not really feasible to just dump the code in your management
> > server-side plugin like some plugins do.
> >
> > In reviewing the code, the two implementations are really very
> > close. If you just updated init to fetch the wrappers based on
> > either an annotation or the class they extend, or something along
> > those lines so this method doesn't have to be edited every time a
> > command is added, that would be more or less the same thing. The
> > the KVM agent would be pluggable like the management server side
> > is.
> >
> > On Thu, Apr 30, 2015 at 12:55 PM, Wilder Rodrigues
> > <WRodrigues@schubergphilis.com<mailto:WRodrigues@schubergphilis.com><m
> ailto:WRodrigues@schubergphilis.com>
> >
> >
> >
> >
> > wrote: Hi Marcus,
> >
> > Apologies for taking so much time to reply to your email, but was,
> > and still am, quite busy. :)
> >
> > I would only use reflection if that was the only way to do it. The
> > use of reflection usually makes the code more complex, which is not
> > good when we have java developers in all different levels (from jr.
> > do sr) working with cloudstack. It also makes us lose the type
> > safety, which might also harm the exception handling if not done
> > well. In addition, if we need to refactor something, the IDE is no
> > longer going to do few things because the refection code cannot be
> > found.
> >
> > If someone will need to extend the LibvirtComputingResource that
> > would be no problem with the approach I’m using. The
> > CitrixResourceBase also has quite few sub-classes and it works just
> > fine.
> >
> > I will document on the wiki page how it should be done when
> > sub-classing the LibvirtComputingResource class.
> >
> > In a quick note/snippet, one would do:
> >
> > public class EkhoComputingResource extends LibvirtComputingResource
> > {
> >
> > @Override public Answer executeRequest(final Command cmd) {
> >
> > final LibvirtRequestWrapper wrapper =
> > LibvirtRequestWrapper.getInstance(); try { return
> > wrapper.execute(cmd, this); } catch (final Exception e) { return
> > Answer.createUnsupportedCommandAnswer(cmd); } } }
> >
> >
> > In the flyweight where I keep the wrapper we could have ():
> >
> > final Hashtable<Class<? extends Command>, CommandWrapper>
> > linbvirtCommands = new Hashtable<Class<? extends Command>,
> > CommandWrapper>(); linbvirtCommands.put(StopCommand.class, new
> > LibvirtStopCommandWrapper());
> >
> > final Hashtable<Class<? extends Command>, CommandWrapper>
> > ekhoCommands = new Hashtable<Class<? extends Command>,
> > CommandWrapper>(); linbvirtCommands.put(StopCommand.class, new
> > EkhoStopCommandWrapper());
> >
> > resources.put(LibvirtComputingResource.class, linbvirtCommands);
> > resources.put(EkhoComputingResource.class, ekhoCommands);
> >
> > But that is needed only if the StopCommand has a different
> > behaviour for the EkhoComputingResource.
> >
> > Once a better version of the documentation is on the wiki, I will
> > let you know.
> >
> > On other matters, I’m also adding unit tests for all the changes.
> > We already went from 4% to 13.6% coverage in the KVM hypervisor
> > plugin. The code I already refactored has 56% of coverage.
> >
> > You can see all the commits here:
> > https://github.com/schubergphilis/cloudstack/tree/refactor/libvirt_r
> >
> >
> es
> >
> >
> > ource
> >
> > Cheers, Wilder
> >
> > On 23 Apr 2015, at 17:26, Marcus
> > <shadowsor@gmail.com<mailto:shadowsor@gmail.com><mailto:shadowsor@gmai
> l.com>>
> > wrote:
> >
> > Great to see someone working on it. What sorts of roadblocks came
> > out of reflection? How does the wrapper design solve the
> > pluggability issue? This is pretty important to me, since I've
> > worked with several companies now that end up subclassing
> > LibvirtComputingResource in order to handle their own Commands on
> > the hypervisor from their server-side plugins, and changing their
> > 'resource' to that in agent.properties. Since the main agent class
> > needs to be set at agent join, this is harder to manage than it
> > should be.
> >
> > I mentioned the reflection model because that's how I tend to
> > handle the commands when subclassing LibvirtComputingResource. I
> > haven't had any problems with it, but then again I haven't tried to
> > refactor 5500 lines into that model, either.
> >
> > On Thu, Apr 23, 2015 at 1:17 AM, Wilder Rodrigues
> > <WRodrigues@schubergphilis.com<mailto:WRodrigues@schubergphilis.com><m
> ailto:WRodrigues@schubergphilis.com>
> >
> >
> >
> >
> > wrote:
> >
> > Hi Marcus,
> >
> > I like the annotation idea, but reflection is trick because it
> > hides some information about the code.
> >
> > Please, have a look at the CitrixResourceBase after the refactor I
> > did. It became quite smaller and test coverage was improved.
> >
> > URL:
> > https://cwiki.apache.org/confluence/display/CLOUDSTACK/Refactoring+X
> >
> >
> en
> >
> >
> > Server+Hypervisor+Plugin
> >
> > The same patter is being about to Libvirt stuff. The coverage on
> > the KVM hypervisor plugin already went from 4 to 10.5% after
> > refactoring 6 commands
> >
> > Cheers, Wilder
> >
> > On 22 Apr 2015, at 23:06, Marcus
> > <shadowsor@gmail.com<mailto:shadowsor@gmail.com><mailto:shadowsor@gmai
> l.com>>
> > wrote:
> >
> > Kind of a tangent, but I'd actually like to see some work done to
> > clean up LibvirtComputing resource. One model I've prototyped that
> > seems to work is to create an annotation, such as
> > 'KVMCommandExecutor', with a 'handles' property. With this
> > annotation, you implement a class that handles, e.g. StartCommand,
> > etc. Then in LibvirtComputingResource, the 'configure' method
> > fetches all of these executors via reflection and stores them in an
> > object. Then, instead of having all of the 'instanceof' lines in
> > LibvirtComputingResource, the executeRequest method fetches the
> > executor that handles the incoming command and runs it.
> >
> > I think this would break up LibvirtComputingResource into smaller,
> > more testable and manageable chunks, and force things like config
> > and utility methods to move to a more sane location, as well. As a
> > bonus, this model makes things pluggable. Someone could ship KVM
> > plugin code containing standalone command executors that are
> > discovered at runtime for things they need to run at the hypervisor
> > level.
> >
> > On Tue, Apr 21, 2015 at 6:27 AM, Wilder Rodrigues
> > <WRodrigues@schubergphilis.com<mailto:WRodrigues@schubergphilis.com><m
> ailto:WRodrigues@schubergphilis.com>
> >
> >
> >
> >
> > wrote:
> >
> > Hi all,
> >
> > Yesterday I started working on the LibvirtComputingResource class
> > in order to apply the same patterns I used in the
> > CitrixResourceBase + add more unit tests to it After 10 hours of
> > work I got a bit stuck with the 1st test, which would cover the
> > refactored LibvirtStopCommandWrapper. Why did I get stuck? The
> > class used a few static methods that call native libraries, which I
> > would like to mock. However, when writing the tests I faced
> > problems with the current Mockito/PowerMock we are using: they are
> > simply not enough for the task.
> >
> > What did I do then? I added a dependency to EasyMock and
> > PowerMock-EasyMock API. It worked almost fine, but I had to add a
> > “-noverify” to both my Eclipse Runtime configuration and also to
> > the cloud-plugin-hypervisor-kvm/pom.xml file. I agree that’s not
> > nice, but was my first attempt of getting it to work. After trying
> > to first full build I faced more problems related to
> > ClassDefNotFoundExpcetion which were complaining about Mockito
> > classes. I then found out that adding the PowerMockRunner to all
> > the tests classes was going to be a heavy burden and would also
> > mess up future changes (e.g. the -noverify flag was removed from
> > Java 8, thus adding it now would be a problem soon).
> >
> > Now that the first 2 paragraphs explain a bit about the problem,
> > let’s get to the solution: Java 8
> >
> > The VerifyError that I was getting was due to the use of the latest
> > EasyMock release (3.3.1). I tried to downgrade it to 3.1/3.2 but it
> > also did not work. My decision: do not refactor if the proper tests
> > cannot be added. This left me with one action: migrate to Java 8.
> >
> > There were mentions about Java 8 in february[1] and now I will put
> > some energy in making it happen.
> >
> > What is your opinion on it?
> >
> > Thanks in advance.
> >
> > Cheers, Wilder
> >
> > http://mail-archives.apache.org/mod_mbox/cloudstack-dev/201502.mbox/
> >
> >
> %3
> >
> >
> > C54EEF6BE.5040401@shapeblue.com<mailto:C54EEF6BE.5040401@shapeblue.com
> >%3E<http://mail-archives.apache.org/mod_m
> >
> >
> box/cloudstack-dev/201502.mbox/<54EEF6BE.5040401@shapeblue.com<mailto:54
> EEF6BE.5040401@shapeblue.com><mailto
> > :54
> >
> >
> > EEF6BE.5040401@shapeblue.com<mailto:EEF6BE.5040401@shapeblue.com>>>>
> >
> >  Regards, Rohit Yadav Software Architect, ShapeBlue
> >
> >
> > [cid:9DD97B41-04C5-45F0-92A7-951F3E962F7A]
> >
> >
> > M. +91 88 262 30892 |
> > rohit.yadav@shapeblue.com<mailto:rohit.yadav@shapeblue.com><mailto:roh
> it.yadav@shapeblue.com>
> >
> >
> Blog: bhaisaab.org<http://bhaisaab.org><http://bhaisaab.org> | Twitter:
> @_bhaisaab
> >
> >
> >
> >
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CSForge – rapid IaaS deployment framework<http://shapeblue.com/csforge/>
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CloudStack Software Engineering<http://shapeblue.com/cloudstack-software-engineering/>
CloudStack Infrastructure Support<http://shapeblue.com/cloudstack-infrastructure-support/>
CloudStack Bootcamp Training Courses<http://shapeblue.com/cloudstack-training/>

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