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xtext maven to use java 8 features [message #1807996]

Fri, 14 June 2019 02:23

paul lu

Messages: 43
Registered: April 2013

Member

Hi,

I want some elements in my DSL (xbase based) to compile to java 8 default interface methods. Works in eclipse. But it doesn't work with maven.

Setting maven.compiler.source to 1.8 does not set version on
org.eclipse.xtext.xbase.compiler.GeneratorConfig
which is used in xbase compiler to determine whether to generate java 8 sources.

Also I find this issue:
https://github.com/eclipse/xtext-maven/issues/11

Is there any workaround now to compile DSL to java 8 sources in maven build ?

Thanks.

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Re: xtext maven to use java 8 features [message #1807997 is a reply to message #1807996]

Fri, 14 June 2019 03:44

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Did you try to sublass, customize and bind generator config in yourdslruntimemodule

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: xtext maven to use java 8 features [message #1808022 is a reply to message #1807997]

Fri, 14 June 2019 06:53

paul lu

Messages: 43
Registered: April 2013

Member

Thanks, I was able to bind a IGeneratorConfig in my runtime module.
But still I'd like to make the source level configurable, preferably use the same source level as the maven property : maven.compiler.source.

It seems there are two separate guice modules in the maven build: MavenStandaloneBuilderModule and my language Module.
The maven property maven.compiler.source is passed to the IJavaCompiler configured in MavenStandaloneBuilderModule.
see https://github.com/eclipse/xtext-maven/blob/master/org.eclipse.xtext.maven.plugin/src/main/java/org/eclipse/xtext/maven/XtextGenerator.java#L192
So it seems impossible to get the maven.compiler.source value in objects maintained by my language Module.

Maybe I need to rely on other approaches such as environment variable or reading external pom files to achieve this.

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