Re: GWT 2.8.0 is not compatible with java6

[Juan Pablo Gardella]

Hi Marko,

I'm using GWT RPC, so it's required gwt-servlet in the WAR file. As it's
deployed in an old Jboss server with java6, by using retrolambda, it's
possible to use gwt-servlet 2.8 in the server.

Juan

On Fri, 4 Nov 2016 at 07:37 Thomas Broyer  wrote:

> With the exception of a few corner-cases, Java 6 source code is also Java
> 8 compliant; so the GWT Compiler should be able to process it even though
> it assumes Java 8 source code.
>
> But the question was about JVM requirements: gwt-servlet.jar is compiled
> as Java 7 bytecode in 2.8, so it requires a Java 7 JVM on your server; and
> similarly gwt-dev and gwt-user require a Java 7 JVM on your developers' and
> CI machines (and if you use GIN, because GWT will "internally" compile your
> sources to Java 8 bytecode and GIN will try to actually run that code,
> you'll need a Java 8 JVM)
> Retrolambda could possibly solve the issue of gwt-servlet at least,
> possibly also gwt-dev/gwt-user at compile-time.
>
>
> On Friday, November 4, 2016 at 11:25:46 AM UTC+1, Marko wrote:
>
> How can you use retrolambda for that? Isn't retrolambda transforming the
> compiled >>bytecode<>source code<< and not
> bytecode...
>
> Marko
>
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Re: GWT 2.8.0 is not compatible with java6

[Thomas Broyer]

With the exception of a few corner-cases, Java 6 source code is also Java 8 
compliant; so the GWT Compiler should be able to process it even though it 
assumes Java 8 source code.

But the question was about JVM requirements: gwt-servlet.jar is compiled as 
Java 7 bytecode in 2.8, so it requires a Java 7 JVM on your server; and 
similarly gwt-dev and gwt-user require a Java 7 JVM on your developers' and 
CI machines (and if you use GIN, because GWT will "internally" compile your 
sources to Java 8 bytecode and GIN will try to actually run that code, 
you'll need a Java 8 JVM)
Retrolambda could possibly solve the issue of gwt-servlet at least, 
possibly also gwt-dev/gwt-user at compile-time.

On Friday, November 4, 2016 at 11:25:46 AM UTC+1, Marko wrote:
>
> How can you use retrolambda for that? Isn't retrolambda transforming the 
> compiled >>bytecode<>source code<< and not 
> bytecode...
>
> Marko
>

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Re: GWT 2.8.0 is not compatible with java6

[Marko]

How can you use retrolambda for that? Isn't retrolambda transforming the 
compiled >>bytecode<>source code<< and not 
bytecode...

Marko

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Re: GWT 2.8.0 is not compatible with java6

[Juan Pablo Gardella]

Hi all,

A workaround to use gwt-2.8.0 in Java 6 is using retrololamda
. Here how I configured it (using
maven), by adding a profile (here the gist

):


production


production





com.google.gwt
gwt-servlet
provided




${basedir}/src/env/production



org.apache.maven.plugins
maven-dependency-plugin
2.10


process-classes

unpack-dependencies


gwt-servlet
${project.build.directory}/classes






net.orfjackal.retrolambda
retrolambda-maven-plugin
2.3.0


process-classes

process-main
process-test




true
1.6





On Wed, 2 Nov 2016 at 10:53 Thomas Broyer  wrote:

>
>
> On Wednesday, November 2, 2016 at 2:38:38 PM UTC+1, Juan Pablo Gardella
> wrote:
>
> Hi all,
>
> At release notes is not mentioned that now it will support only java7.
>
>
> Good catch!
>
>
> I found tbroyer comment here:
> http://stackoverflow.com/questions/28879590/jdk-and-jre-minimal-versions-required-for-gwt-compiling-and-running
>
> Can be updated the release notes with that?
> http://www.gwtproject.org/release-notes.html#Release_Notes_2_8_0
>
> Let me know, I can create the pull request.
>
>
> Yes please, go ahead.
>
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>

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Re: GWT 2.8.0 is not compatible with java6

[Thomas Broyer]

On Wednesday, November 2, 2016 at 2:38:38 PM UTC+1, Juan Pablo Gardella 
wrote:
>
> Hi all,
>
> At release notes is not mentioned that now it will support only java7.
>

Good catch!
 

> I found tbroyer comment here:
> http://stackoverflow.com/questions/28879590/jdk-and-jre-minimal-versions-required-for-gwt-compiling-and-running
>
> Can be updated the release notes with that?
> http://www.gwtproject.org/release-notes.html#Release_Notes_2_8_0 
>
> Let me know, I can create the pull request.
>

Yes please, go ahead. 

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GWT 2.8.0 is not compatible with java6

[Juan Pablo Gardella]

Hi all,

At release notes is not mentioned that now it will support only java7. I
found tbroyer comment here:
http://stackoverflow.com/questions/28879590/jdk-and-jre-minimal-versions-required-for-gwt-compiling-and-running

Can be updated the release notes with that?
http://www.gwtproject.org/release-notes.html#Release_Notes_2_8_0

Let me know, I can create the pull request.

Thanks,
Juan

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