GWT 2.8.0-beta1 available for testing

[Daniel Kurka]

Hi all,

we just finished testing for GWT 2.8.0-beta1. You can either download it from goo.gl/62SeR5 or from maven central.

Release notes can be found here.

Please start testing and let us know about any issues you encounter by either discussion here or filing bugs on github.

-Daniel

[luca.masini]

Hi, I need also the gwt-maven-plugin 2.8.0-beta, the old 2.7.0 put on the classpath the old gwt-user and my projects break.

Thank you.

[Thomas Broyer]

On Friday, December 4, 2015 at 1:01:39 PM UTC+1, luca.masini wrote:

Hi, I need also the gwt-maven-plugin 2.8.0-beta,

Mojo's Plugin for GWT is an independent project, and indeed there's a 2.8.0-SNAPSHOT version (hasn't been updated for months though, some arguments might break, e.g. jsInteropMode).

It's in https://oss.sonatype.org/content/repositories/snapshots

 

the old 2.7.0 put on the classpath the old gwt-user and my projects break.

Unless you tell if to use 2.8.0-SNAPSHOT: https://gwt-maven-plugin.github.io/gwt-maven-plugin/user-guide/using-different-gwt-sdk-version.html

(make sure you declare https://oss.sonatype.org/content/repositories/google-snapshots in both repositories and pluginRepositories).

Of course, there's also the alternative to use a plugin that's not bound to a specific version of GWT: https://tbroyer.github.io/gwt-maven-plugin/ (shameless plug)

BTW, we may switch the GWT samples to that plugin in the near future…

[Paul Robinson]

Is it intentional/necessary that gwt-servlet.jar is compiled for Java 7 and not Java 6?

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[Jens]

Is it intentional/necessary that gwt-servlet.jar is compiled for Java 7 and not Java 6?

gwt-servlet.jar isn't really compiled, its just assembled. The build script compiles gwt-dev and gwt-user using Java 7 as minimum and then gwt-servlet.jar is created by pulling in a subset of already compiled classes of gwt-user and gwt-dev. That means gwt-servlet.jar also requires Java 7. So generally its intentional.

Also as soon as we land Java 8 API emulations GWT will be compiled using Java 8 which would mean gwt-servlet.jar also requires Java 8. Its probably not possible to keep gwt-servlet.jar compatible to Java 7 because as soon as we add java.time emulation to GWT we probably also add GWT-RPC custom field serializers for Java 8 classes like LocalDate, etc.

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[Juan Pablo Gardella]

It will be very useful to make gwt-servlet compatible with java 6

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[Thomas Broyer]

Given the intricacies of code dependencies, this is not going to be easy, and unless someone for whom it really matters jumps in to contribute a patch (possibly with help from maintainers) I'm afraid it's not going to be addressed.

Maybe it'd be easier to run Retrolambda or something similar on the "extracted" JAR to produce a Java6-compatible JAR; question is whether this should be done in GWT or in the applications that will run in a Java 6 JRE.

On Saturday, December 5, 2015 at 12:47:36 AM UTC+1, juan_pablo_gardella wrote:

It will be very useful to make gwt-servlet compatible with java 6

On 4 December 2015 at 17:41, Jens <jens.ne...@gmail.com> wrote:

Is it intentional/necessary that gwt-servlet.jar is compiled for Java 7 and not Java 6?

gwt-servlet.jar isn't really compiled, its just assembled. The build script compiles gwt-dev and gwt-user using Java 7 as minimum and then gwt-servlet.jar is created by pulling in a subset of already compiled classes of gwt-user and gwt-dev. That means gwt-servlet.jar also requires Java 7. So generally its intentional.

Also as soon as we land Java 8 API emulations GWT will be compiled using Java 8 which would mean gwt-servlet.jar also requires Java 8. Its probably not possible to keep gwt-servlet.jar compatible to Java 7 because as soon as we add java.time emulation to GWT we probably also add GWT-RPC custom field serializers for Java 8 classes like LocalDate, etc.

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[Goktug Gokdogan]

As you mention, it looks like the only reason to compile with Java8 is the custom field serializers. When that happens, those extra custom field serializers could be supplied as a separate jar.

 

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[István Horváth]

it would nice to have if you update the release notes page with exact dates on all of the version on both the links and the linked details too.

http://www.gwtproject.org/release-notes.html

[Julien Dramaix]

Feel free to fill a patch for that :)

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[Colin Alworth]

If I could be permitted to slight restate what Julien just said: We will make a note of it, as we have done in the past, such as when the default moved from java6 to java7: http://www.gwtproject.org/release-notes.html#Release_Notes_2_6_0_RC1. That being said, we of course welcome any community assistance in maintaining GWT, and documentation is an excellent place to get started and make significant contributions without going through the code review process that GWT requires.

Java6 has been EOL'd for almost three years, though technically Java7 has also reached that stage (last April). As long as we hang on to support for Java6, we would be unable to use new classes/methods/features of Java7 (and Java8), excepting the use of something like retrolambda like Thomas suggested. We would likewise welcome any testing in that area after performing an automated change to the gwt-servlet.jar. If you find problems or discover that it works perfectly, and if you share the build scripts you used to achieve it, that would make it easier to include these changes into the official release.

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[István Horváth]

good, where can i find exact dates about release dates (full date, like year month and day) from the beginning?

[István Horváth]

i not sure about this link has the correct dates: https://en.wikipedia.org/wiki/Google_Web_Toolkit

also it lacks of 2.5.0 and 2.5.1

[Colin Alworth]

Sorry, I hadn't understood that your primary interest was in release dates, but though it was more for compatibility with upstream or related tools on release. That said, I think that the list of downloads at https://code.google.com/p/google-web-toolkit/downloads/list may prove useful for historical release dates. 

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[Thomas Broyer]

On Monday, December 7, 2015 at 4:40:22 PM UTC+1, István Horváth wrote:

good, where can i find exact dates about release dates (full date, like year month and day) from the beginning?

https://code.google.com/archive/p/google-web-toolkit/downloads has all the old ones.

Starting with 2.1.0 (5 years ago), releases have "official" Maven artifacts, so you can find their dates here: https://search.maven.org/#search%7Cgav%7C1%7Cg%3A%22com.google.gwt%22%20AND%20a%3A%22gwt%22

[István Horváth]

ok, i have PR for this, i hope it fits Google's needs.

2015. december 7., hétfő 15:47:50 UTC+1 időpontban Julien Dramaix a következőt írta:

Feel free to fill a patch for that :)

On Mon, Dec 7, 2015 at 2:28 PM István Horváth <arm...@gmail.com> wrote:

it would nice to have if you update the release notes page with exact dates on all of the version on both the links and the linked details too.

http://www.gwtproject.org/release-notes.html

2015. december 4., péntek 10:51:13 UTC+1 időpontban Daniel Kurka a következőt írta:

Hi all,

we just finished testing for GWT 2.8.0-beta1. You can either download it from goo.gl/62SeR5 or from maven central.

Release notes can be found here.

Please start testing and let us know about any issues you encounter by either discussion here or filing bugs on github.

-Daniel

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[Juan Pablo Gardella]

Hi contributors,

I've created a google doc with full GWT 2.8.0 release notes. It's divided by features/components and links for each commit. I didn't put reverted commits, and fixes over features like JSInterop. Everyone can put comments. It could be added later at GWT official documentation once gwt 2.8.0 is completed.

Juan

On 7 December 2015 at 11:15, István Horváth <arm...@gmail.com> wrote:

ok, i have PR for this, i hope it fits Google's needs.

2015. december 7., hétfő 15:47:50 UTC+1 időpontban Julien Dramaix a következőt írta:

Feel free to fill a patch for that :)

On Mon, Dec 7, 2015 at 2:28 PM István Horváth <arm...@gmail.com> wrote:

it would nice to have if you update the release notes page with exact dates on all of the version on both the links and the linked details too.

http://www.gwtproject.org/release-notes.html

2015. december 4., péntek 10:51:13 UTC+1 időpontban Daniel Kurka a következőt írta:

Hi all,

we just finished testing for GWT 2.8.0-beta1. You can either download it from goo.gl/62SeR5 or from maven central.

Release notes can be found here.

Please start testing and let us know about any issues you encounter by either discussion here or filing bugs on github.

-Daniel

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[Julien Dramaix]

This is really nice!

Could you create a pull request on the existing Release note and add the missing items ? 

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[Paul Robinson]

On Mon, Dec 7, 2015 at 3:06 PM, Colin Alworth <nilo...@gmail.com> wrote:

If I could be permitted to slight restate what Julien just said: We will make a note of it, as we have done in the past, such as when the default moved from java6 to java7: http://www.gwtproject.org/release-notes.html#Release_Notes_2_6_0_RC1. 

I was questioning what happens for GWT RPC in production at runtime.

GWT 2.6 (and also 2.7) did not require Java 7 at runtime for RPC, whereas GWT 2.8 does. Does the suggestion that it might require Java 8 by the time GWT 2.8 is released apply to compile time or run time?

The release notes should separate the requirements for compile time and run time Java environment.

[Thomas Broyer]

On Tuesday, December 8, 2015 at 1:54:40 PM UTC+1, Paul Robinson wrote:

On Mon, Dec 7, 2015 at 3:06 PM, Colin Alworth <nilo...@gmail.com> wrote:

If I could be permitted to slight restate what Julien just said: We will make a note of it, as we have done in the past, such as when the default moved from java6 to java7: http://www.gwtproject.org/release-notes.html#Release_Notes_2_6_0_RC1. 

I was questioning what happens for GWT RPC in production at runtime.

GWT 2.6 (and also 2.7) did not require Java 7 at runtime for RPC, whereas GWT 2.8 does. Does the suggestion that it might require Java 8 by the time GWT 2.8 is released apply to compile time or run time?

With the current build scripts, yes; and it'll be quite hard to decouple the two.

 

The release notes should separate the requirements for compile time and run time Java environment.

You have no guarantee that your code will run in an earlier Java environment when you compile with a later one (i.e. if you cross-compile; see https://docs.oracle.com/javase/8/docs/technotes/tools/unix/javac.html#BHCIJIEG). Things used to work earlier, but Java 8 makes it very real.

See http://developer-blog.cloudbees.com/2014/12/beware-siren-target-call.html and http://www.draconianoverlord.com/2014/04/01/jdk-compatibility.html for examples of that.

If you want to be compatible with Java 6, you should use a Java 6 JDK or at least a Java 6 bootclasspath (though as I said, Java 7 is in most cases –if not all– compatible with Java 6 if you make sure you don't use Java7-specific APIs).

If you require Java 8 at compile-time, then there are risks that your code won't work in a Java 6 or Java 7 environment.

If any statement could me made, it'd be about client-side and server-side; or compile-time in the sense of the GWT Compiler, not to be confused with JavaC.

Building GWT in a way such that it's compatible at runtime with Java 7 (or 6) would at a minimum require building it (JavaC) with Java 7 (or 6) and then running tests with Java 8; or running Retrolambda or similar on gwt-servlet and requestfactory-* (but then ideally those would have to be exercised too). Anything else would require changing the build scripts and be much more complicated.

Because Oracle Java 7 is EOL'd, the chances that this happens are very low unless someone helps make it happen (or Vaadin, Sencha or RedHat –who have paying customers that probably would face that issue– possibly jump in).

(note: this is me talking, not in the name of the steering committee).

[Paul Robinson]

Thanks for the clarification Thomas.

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[Pedro Lamarão]

Em sexta-feira, 4 de dezembro de 2015 07:51:13 UTC-2, Daniel Kurka escreveu:

 

Please start testing and let us know about any issues you encounter by either discussion here or filing bugs on github.

Is it ready for use with Google Plugin for Eclipse?
I added it as a new SDK and retargeted my projects -- in the build path, in the compiler path for annotations.
A build with the GWT compilers ends with:

[ERROR] Unexpected internal compiler error
java.lang.NoSuchMethodError: com.google.gwt.util.tools.shared.Md5Utils.getMd5Digest(Ljava/lang/String;)[B
    at com.google.gwt.dev.util.CompilerVersion.getHash(CompilerVersion.java:42)
    at com.google.gwt.dev.javac.PersistentUnitCacheDir.<clinit>(PersistentUnitCacheDir.java:53)
    at com.google.gwt.dev.javac.PersistentUnitCache$BackgroundService.<init>(PersistentUnitCache.java:275)
    at com.google.gwt.dev.javac.PersistentUnitCache.<init>(PersistentUnitCache.java:104)
    at com.google.gwt.dev.javac.UnitCacheSingleton.get(UnitCacheSingleton.java:98)
    at com.google.gwt.dev.Compiler.getOrCreateUnitCache(Compiler.java:89)
    at com.google.gwt.dev.Compiler.run(Compiler.java:183)
    at com.google.gwt.dev.Compiler.run(Compiler.java:156)
    at com.google.gwt.dev.Compiler$1.run(Compiler.java:117)
    at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:55)
    at com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:50)
    at com.google.gwt.dev.Compiler.main(Compiler.java:124)

P.

[Brandon Donnelson]

I think you may have two libraries on the classpath. Regarding Eclipse, it is ready. 

Find the download that will work with mars and GWT 2.8. 

http://gwt-plugins.github.io/documentation/gwt-eclipse-plugin/Download.html

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[Brandon Donnelson]

Oops, a library is missing from the classpath. :) Try adding gwt-dev. 

[Pedro Lamarão]

Changing the SDK version in the Google configuration tab had a strange effect in the build path of my projects.
Manually resetting the build path solved my issue.
Thanks!
P.

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[Goktug Gokdogan]

Hi Brandon. Little bit of topic but I think we may want to make it less convenient to use old devmode as it is deprecated. You may want to remove the options for dev mode in GPE (if you haven't already). For example, the default menu option for running unit test is to run it in dev mode.

On Tue, Dec 8, 2015 at 9:42 AM, Brandon Donnelson <brandon....@sencha.com> wrote:

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[stuckagain]

Great news!

I tried to recompile with Java8 and GWT 2.8 beta1 a project I am working on. But I see these 2 errors:

guava-gwt 18.0 does not seem to compile:

[INFO]    Tracing compile failure path for type 'com.google.common.collect.GwtPlatform'
[INFO]       [ERROR] Errors in 'jar:file:/C:/Users/dnouls/.m2/repository/com/google/guava/guava-gwt/18.0/guava-gwt-18.0.jar!/com/goo
gle/common/collect/super/com/google/common/collect/GwtPlatform.java'
[INFO]          [ERROR] Line 38: The method createFrom(T[], int) is undefined for the type Array

GQuery 1.4.3 also has a problem:

Tracing compile failure path for type 'com.google.gwt.query.client.GQuery'
   [ERROR] Errors in 'jar:file:/C:/Users/dnouls/.m2/repository/com/googlecode/gwtquery/gwtquery/1.4.3/gwtquery-1.4.3.jar!/
/gwt/query/client/GQuery.java'
      [ERROR] Line 226: The method $(Element) is ambiguous for the type GQuery

On Friday, December 4, 2015 at 10:51:13 AM UTC+1, Daniel Kurka wrote:

Hi all,

we just finished testing for GWT 2.8.0-beta1. You can either download it from goo.gl/62SeR5 or from maven central.

Release notes can be found here.

Please start testing and let us know about any issues you encounter by either discussion here or filing bugs on github.

-Daniel

[Thomas Broyer]

On Wednesday, December 9, 2015 at 5:22:28 PM UTC+1, stuckagain wrote:

Great news!

I tried to recompile with Java8 and GWT 2.8 beta1 a project I am working on. But I see these 2 errors:

guava-gwt 18.0 does not seem to compile:

[INFO]    Tracing compile failure path for type 'com.google.common.collect.GwtPlatform'
[INFO]       [ERROR] Errors in 'jar:file:/C:/Users/dnouls/.m2/repository/com/google/guava/guava-gwt/18.0/guava-gwt-18.0.jar!/com/goo
gle/common/collect/super/com/google/common/collect/GwtPlatform.java'
[INFO]          [ERROR] Line 38: The method createFrom(T[], int) is undefined for the type Array

Known issue: https://github.com/google/guava/wiki/Release19#gwt-notes

TL;DR: use Guava 19.0-SNAPSHOT.

[Lars]

For the guava related issue you could also check this https://groups.google.com/forum/m/#!topic/google-web-toolkit-contributors/VbokswmVz9w

[Thomas Broyer]

So, we talked about it during our Steering Committee meeting today and, hoping I'm transcribing correctly:

• GWT has moved to Java 7 and uses Java 7-isms, so Java 6 compatibility is gone (but I believe we announced it at some point already, that 2.7 would be the last version to support Java 6)
• the current patches in review adding Java 8-only emulations (using defender methods in interfaces for instance) are only about super-sources, so shouldn't change the current requirement (i.e. they don't mean GWT would require Java 8)
• as long as GWT can be built with Java 7, GWT 2.8 will be compatible with Java 7. We'll have to discuss the matter again if there's a change requiring Java 8 (such as CustomFieldSerializers for new Java 8 classes), so it's not totally excluded that GWT 2.8 might require Java 8 (and as I said above, if that's the case, it would mean gwt-servlet.jar would require Java 8 too unless one uses Retrolambda or similar; if that ever happens, –and this is my own comment, not in the name of the Steering Committee– contributions to apply Retrolambda during the build would be welcome, to produce a com.google.gwt:gwt-servlet:2.8.0:java7 in addition to the "normal" com.google.gwt:gwt-servlet:2.8.0 requiring Java 8).

TL;DR: Java 6 compat is gone, GWT still compatible with Java 7 and 2.8 will likely be, though might require Java 8.

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[David]

I don't seem to have access to 19.0 snapshot, but 19.0 is out. However it does not work with gwt 2.8 beta1. So I am stuck on this since I will need to wait for 20.0 which will be released after gwt 2.8 is released.

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[Guillaume Rebesche]

Hi,

I have updated to 2.8.0-beta1 our big application without major issues (have to use guava 19.0-SNAPSHOT and gwt-maven-plugin 2.8.0-SNAPSHOT for now).

Everything looks good except the SDM refresh. If I do a small change, stop SDM and recompile, everything is good. But I do the same small change and refresh I have some errors (big trace in attached file) related to Gin (I'm using the latest (yet old) version of Gin).

Doesn't anyone have any idea why a full recompile work but not a refresh?

cheers,

Guillaume