Request Java 11 update to OSGi Example

[jeujai]

My company still supports Java 8 so there is no immediate impediment to iterating on the current example but we're actively moving our apps to Java 11 and it'd be great if we can do the same with GraphQL + OSGi. Certainly, the improved optics from being on the latest and greatest LTS release of Java is secondary to the dynamic capabilities that Apache Karaf offers but it does have value, especially in the long term.

[sergehuber]

Actually the question is not so much about the OSGi Karaf under Java 11 but rather that it seems that there are problems either :

• Compiling the current gradle project (with Gradle 3.5) with JDK 11
• Compiling the current gradle project (updated to Gradle 5.6)

[jeujai]

Thanks for clarifying, Serge! Your post describes exactly what I ran into.

[oliemansm]

I was able to compile the main project with JDK 11 and Gradle 4.10.3. Does that solve the problem for you?

[oliemansm]

@sergehuber When checking for Gradle deprecations to be ble to upgrade to 5.6 I get the following warning which seems to be OSGI related:

> Task :jar
Registering invalid inputs and outputs via TaskInputs and TaskOutputs methods has been deprecated. This is scheduled to be removed in Gradle 5.0. A problem was found with the configuration of task ':jar'.
 - File 'C:\Code\Scopisto\GraphQL\graphql-java-servlet\bnd.bnd' specified for property '$1' does not exist.
Do not cast FileCollection to File[]. This has been deprecated and is scheduled to be removed in Gradle 5.0.

I'm not familiar with OSGI unfortunately and googling it isn't really getting me solutions. Do you know what's going on here and how to solve it?

It's caused by this part in build.gradle:

jar {
    manifest {
        instruction 'Require-Capability', 'osgi.extender'
    }
}

[oliemansm]

@benfortuna You seem to have OSGi experience. Any chance you could help out with this one?

[benfortuna]

@oliemansm I don't use Apache Karaf directly, but I have seen some compatibility issues with Java 11 in the OSGi environments I am working with.

I'm not sure if the problem here is a compilation or runtime issue, but if you update to the latest bnd plugin it might resolve some of the compilation warnings: #238

[oliemansm]

This should be fixed with the recently release 9.1.0 version as mentioned above.