avoid duplicated publication

Author: ndr-brt

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

@@ -19,7 +19,6 @@
 import org.gradle.api.Plugin;
 import org.gradle.api.Project;
 import org.gradle.api.publish.maven.tasks.AbstractPublishToMaven;
-import org.gradle.api.tasks.TaskCollection;
 import org.gradle.plugins.signing.Sign;
 
 import static java.util.List.of;
@@ -51,12 +50,6 @@ public void apply(Project target) {
         // apply all plugins
         target.getPlugins().apply(EdcBuildBasePlugin.class);
 
-        // add task dependency to permit publication
-        var publish = target.getTasks().findByName("publishMavenJavaPublicationToMavenCentralRepository");
-        if (publish != null) {
-            publish.dependsOn("signMavenPublication");
-        }
-
         target.getTasks().withType(AbstractPublishToMaven.class).configureEach(task -> {
             var signTasks = target.getTasks().withType(Sign.class);
             task.mustRunAfter(signTasks);

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

@@ -48,23 +48,21 @@ public void apply(Project target) {
 
         var buildExt = requireExtension(target, BuildExtension.class);
         var shouldPublish = buildExt.getPublish().getOrElse(DEFAULT_SHOULD_PUBLISH);
+        var publishExtension = requireExtension(target, PublishingExtension.class);
 
         if (shouldPublish) {
-            var pe = requireExtension(target, PublishingExtension.class);
 
-            if (pe.getPublications().findByName(target.getName()) == null) {
-                pe.publications(publications -> publications.create(target.getName(), MavenPublication.class,
-                        mavenPublication -> {
-                            mavenPublication.from(target.getComponents().getByName("java"));
-                            mavenPublication.setGroupId(buildExt.getPom().getGroupId());
-                            mavenPublication.suppressPomMetadataWarningsFor("testFixturesApiElements");
-                            mavenPublication.suppressPomMetadataWarningsFor("testFixturesRuntimeElements");
-                        }));
-            }
+            publishExtension.getPublications().getByName("maven", publication -> {
+                if (publication instanceof MavenPublication mavenPublication) {
+                    mavenPublication.setGroupId(buildExt.getPom().getGroupId());
+                }
+            });
 
             target.getExtensions().configure(MavenPublishBaseExtension.class, extension -> {
                 extension.publishToMavenCentral(true);
             });
+        } else {
+            publishExtension.getPublications().clear();
         }
     }