Agree, there are some corner cases, but normally gwt developers have to deal with a bunch of differences between java and gwt.
Anyway I think that it's better that SDK7 users assume some language issues than not be able to compile their projects at all. On Thu, Feb 18, 2016 at 10:17 AM, 'Daniel Kurka' via GWT Contributors < google-web-toolkit-contributors@googlegroups.com> wrote: > We have seen issues internally where some code would be a compile error in > Java8 but not in Java7 (especially around type checking). This setup will > leave users vulnerable to this since their code will compile in their IDE, > but will fail GWT compile. > > On Thu, Feb 18, 2016 at 8:57 AM Manuel Carrasco Moñino <man...@apache.org> > wrote: > >> I follow, but I have a couple of thoughts >> >> - Is it actually useful from the user perspective to use a >> sourceLevel=1.7 if he has to manually provide a compatible >> gwt-jre-emulation? >> IMO, he might want that everything works out-of-the-boxy. Right now, gwt >> emul classes in the 2.8-snapshot make fail sourceLevel=1.7 though, so I >> don't see any reason to deliver gwt-2.8.0 with a non working flag. >> >> - IMHO, for real users having to code in 1.7, it's not a problem to set >> javac.source=1.7 and have gwtc.sourceLevel=default=1.8. In this case the >> javac compiler will validate his source code and gwtc compiler does not >> need to do the validation, it simply works without raising any error when >> processing its internal jre-emul classes. >> >> So, since gwtc can be run with a sdk7 (even with gwt java8 sources), >> there should not be any problem compiling gwt projects written in java7 and >> compiled with sdk7, and the user does not bother about the sourceLevel flag. >> >> >> >> On Wed, Feb 17, 2016 at 9:13 PM, 'Goktug Gokdogan' via GWT Contributors < >> google-web-toolkit-contributors@googlegroups.com> wrote: >> >>> I think you didn't understand what I said. Let me try to clarify: >>> >>> "For any reason, if community wants to run the GWT 2.8 SDK in Java 7 >>> source level *(i.e. gwtc sourcelevel 7)*, they can theoretically do it >>> by supplying *a java7 compatible JRE emulation* without any >>> compiler/SDK changes *(but just setting the gwtc sourcelevel 7)*. >>> That's why I didn't originally remove Java7 option from the SourceLevel >>> flag. >>> By removing the flag (which seems submitted now), the community will not >>> have that option *(i.e. they need also supply a modified compiler >>> together with the emulation)*." >>> >>> This may never happen but keeping the flag was cheap so I kept it. >>> >>> On Tue, Feb 16, 2016 at 11:35 PM, Manuel Carrasco Moñino < >>> man...@apache.org> wrote: >>> >>>> Removing the 1.7 flag does not make the compiler fail when using a >>>> java7 sdk. >>>> Now the compiler always thinks that source code is sourced-level 1.8 so >>>> it does not fail when looking at java8 emul classes. >>>> >>>> You can still have the java.source property set to 1.7 when compiling >>>> your project and javac will validate that your code is java7 compliant, >>>> because javac process your client code. >>>> >>>> In summary javac and gwtc could use at the same time different source >>>> languages, but we always need to force gwtc to use 1.8 since new java8 api >>>> emul code. >>>> >>>> >>>> On Wed, Feb 17, 2016 at 2:32 AM, 'Goktug Gokdogan' via GWT Contributors >>>> <google-web-toolkit-contributors@googlegroups.com> wrote: >>>> >>>>> To remind the backlog of this: >>>>> >>>>> GWT 2.8 decided to support only Java8 source level (see related >>>>> threads from last year) as the emulation will include Java 8 APIs which >>>>> cannot be compiled in Java7 mode. >>>>> >>>>> However, GWT compiler itself is intended to be runnable in a Java 7 >>>>> JVM. This should enable slow-to-upgrade enterprises business to keep their >>>>> legacy dev environments. >>>>> For any reason, if community wants to run the GWT 2.8 SDK in Java 7 >>>>> source level, they can theoretically do it by supplying a java7 compatible >>>>> JRE emulation without any compiler/SDK changes. That's why I didn't >>>>> originally remove Java7 option from the SourceLevel flag. >>>>> By removing the flag (which seems submitted now), the community will >>>>> not have that option. >>>>> >>>>> (It is not import from Google side; just wanted to let you know if the >>>>> community cares about it.) >>>>> >>>>> On Mon, Feb 15, 2016 at 5:12 AM, Thomas Broyer <t.bro...@gmail.com> >>>>> wrote: >>>>> >>>>>> >>>>>> >>>>>> On Monday, February 15, 2016 at 11:39:02 AM UTC+1, Thomas Broyer >>>>>> wrote: >>>>>>> >>>>>>> >>>>>>> >>>>>>> On Monday, February 15, 2016 at 10:06:47 AM UTC+1, Manuel Carrasco >>>>>>> Moñino wrote: >>>>>>>> >>>>>>>> Thomas, I want to experiment with this, pls, could you give me some >>>>>>>> advise what are the classes I have to look at? >>>>>>>> >>>>>>> >>>>>>> https://gwt-review.googlesource.com/14353 >>>>>>> (currently running the testsuite locally) >>>>>>> >>>>>> >>>>>> Tests pass \o/ >>>>>> >>>>>> -- >>>>>> You received this message because you are subscribed to 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<https://groups.google.com/d/msgid/google-web-toolkit-contributors/CAM28XAsQGwM4MRA-aBxoze-1MQ_fzeCQp4Jxw1Hc2o0FiOtmHA%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "GWT Contributors" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to google-web-toolkit-contributors+unsubscr...@googlegroups.com >>> . >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/google-web-toolkit-contributors/CAN%3DyUA2LYKb1U_1eTH0whd%3DUjXgaudG1NBqugy54eEq8Rw7eoA%40mail.gmail.com >>> <https://groups.google.com/d/msgid/google-web-toolkit-contributors/CAN%3DyUA2LYKb1U_1eTH0whd%3DUjXgaudG1NBqugy54eEq8Rw7eoA%40mail.gmail.com?utm_medium=email&utm_source=footer> >>> . >>> >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- >> You 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