fix: remove JavaConvention (#425)

Author: ndr-brt

plugins/edc-build/src/main/java/org/eclipse/edc/plugins/edcbuild/EdcBuildPlugin.java

@@ -34,7 +34,6 @@
 import static org.eclipse.edc.plugins.edcbuild.conventions.Conventions.checkstyle;
 import static org.eclipse.edc.plugins.edcbuild.conventions.Conventions.defaultDependencies;
 import static org.eclipse.edc.plugins.edcbuild.conventions.Conventions.jar;
-import static org.eclipse.edc.plugins.edcbuild.conventions.Conventions.java;
 import static org.eclipse.edc.plugins.edcbuild.conventions.Conventions.mavenPom;
 import static org.eclipse.edc.plugins.edcbuild.conventions.Conventions.mavenPublication;
 import static org.eclipse.edc.plugins.edcbuild.conventions.Conventions.mavenPublishing;
@@ -73,7 +72,6 @@ public void apply(Project target) {
             // apply the conventions
             of(
                     rootBuildScript(),
-                    java(),
                     repositories(),
                     defaultDependencies(),
                     checkstyle(),

plugins/edc-build/src/main/java/org/eclipse/edc/plugins/edcbuild/conventions/Conventions.java

@@ -43,10 +43,6 @@ public static EdcConvention mavenPom() {
         return new MavenArtifactConvention();
     }
 
-    public static EdcConvention java() {
-        return new JavaConvention();
-    }
-
     public static EdcConvention allDependencies() {
         return new AllDependenciesConvention();
     }

plugins/edc-build/src/main/java/org/eclipse/edc/plugins/edcbuild/conventions/JavaConvention.java

@@ -18,7 +18,6 @@
 import org.gradle.api.Action;
 import org.gradle.api.model.ObjectFactory;
 import org.gradle.api.provider.Property;
-import org.gradle.jvm.toolchain.JavaLanguageVersion;
 
 /**
  * Root configuration resource for the EDC Build plugin
@@ -47,8 +46,6 @@ public MavenPomExtension getPom() {
         return pom;
     }
 
-    public abstract Property<JavaLanguageVersion> getJavaLanguageVersion();
-
     public SwaggerGeneratorExtension getSwagger() {
         return swagger;
     }