Exception on launching grails app with RC1 version

[matias...@brinqa.com]

I added these dependencies to my grails app:

"io.projectreactor:reactor-core:2.0.0.RC1",
"io.projectreactor:reactor-groovy:2.0.0.RC1",
"io.projectreactor.spring:reactor-spring-context:2.0.0.RC1"

I'm getting this exception:

Fatal error during compilation org.apache.tools.ant.BuildException: java.lang.UnsupportedClassVersionError: reactor/groovy/ext/ObservableExtensions : Unsupported major.minor version 52.0

It looks that it needs JRE 8, isn't it? I can't upgrade my project from Java 7 right now. Is this mandatory?

Thanks,

Matias.

[Jon Brisbin]

Java should not be mandatory, no. It looks like our CI server is somehow not producing Java 7 version class files, even though I thought we had all that worked out in the build already.

Our settings “should” be right:

compileGroovy {
 sourceCompatibility = 1.7
 targetCompatibility = 1.7
}

But something is obviously *not* right! :(

I’ll get with our CI guy and see if we can figure something out. I suspect it will mean using build snapshots until we can roll an RC2.

Thanks!

Jon Brisbin

Reactor Project Lead
@j_brisbin | @ProjectReactor

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[Matias Burak]

Good… i’ll wait for that.

One other thing I've noticed is that springVersion on reactor-spring is 4.1.3.RELEASE. Is Spring 4 mandatory? Is it possible to use it on a Spring 3 project?

[Jon Brisbin]

If you’re not using the TaskExecutors or annotated bean (@Consumer) event handling and are creating Streams directly in @Bean methods, you should be able to use Reactor 2.0 with Spring 3.0 just fine.

AFAIK only the autoconfiguration (@EnableReactor) and use of @Consumer proxy injection would be affected by downgrading to Spring 3. That and I believe the TaskExecutor interfaces are different.

Thanks!

Jon Brisbin

Reactor Project Lead
@j_brisbin | @ProjectReactor

[Matias Burak]

Great.

When do you think you’ll have reactor-groovy available for Java 7?

Thanks!

Matias.