fix (openshift-client) : Fix OSGi startup exceptions while using Kube…

…rnetesClient/OpenShiftClient

+ Remove ExtensionAdapter reference from ManagedKubernetesClient, no
  provider is exposed for ExtensionAdapter interface in
  kubernetes-client module. bindExtensionAdapter and
  unbindExtensionAdapter are throwing NullPointerException during
  startup.
+ Add Provide-Capability field in openshift-client bundle configuration
  in order to resolve SPIFly related NPE (reported in #3890)

Signed-off-by: Rohan Kumar <rohaan@redhat.com>

kubernetes-client/src/main/java/io/fabric8/kubernetes/client/osgi/ManagedKubernetesClient.java

@@ -21,7 +21,6 @@
 import io.fabric8.kubernetes.client.NamespacedKubernetesClient;
 import io.fabric8.kubernetes.client.OAuthTokenProvider;
 import io.fabric8.kubernetes.client.ResourceHandler;
-import io.fabric8.kubernetes.client.extension.ExtensionAdapter;
 import org.apache.felix.scr.annotations.Activate;
 import org.apache.felix.scr.annotations.Component;
 import org.apache.felix.scr.annotations.ConfigurationPolicy;
@@ -66,7 +65,6 @@
 @Service({ KubernetesClient.class, NamespacedKubernetesClient.class })
 @References({
     @Reference(referenceInterface = io.fabric8.kubernetes.client.ResourceHandler.class, cardinality = ReferenceCardinality.OPTIONAL_MULTIPLE, policy = ReferencePolicy.DYNAMIC, bind = "bindResourceHandler", unbind = "unbindResourceHandler"),
-    @Reference(referenceInterface = ExtensionAdapter.class, cardinality = ReferenceCardinality.OPTIONAL_MULTIPLE, policy = ReferencePolicy.DYNAMIC, bind = "bindExtensionAdapter", unbind = "unbindExtensionAdapter"),
     @Reference(referenceInterface = OAuthTokenProvider.class, cardinality = ReferenceCardinality.OPTIONAL_UNARY, policyOption = ReferencePolicyOption.GREEDY, bind = "bindOAuthTokenProvider", unbind = "unbindOAuthTokenProvider")
 })
 public class ManagedKubernetesClient extends NamespacedKubernetesClientAdapter<DefaultKubernetesClient> {
@@ -191,14 +189,6 @@ public void unbindResourceHandler(ResourceHandler resourceHandler) {
     // not used
   }
 
-  public void bindExtensionAdapter(ExtensionAdapter adapter) {
-    getClient().getAdapters().register(adapter);
-  }
-
-  public void unbindExtensionAdapter(ExtensionAdapter adapter) {
-    getClient().getAdapters().unregister(adapter);
-  }
-
   public void bindOAuthTokenProvider(OAuthTokenProvider provider) {
     this.provider = provider;
   }

openshift-client/pom.xml

@@ -33,6 +33,11 @@
       osgi.extender;
       filter:="(osgi.extender=osgi.serviceloader.registrar)"
     </osgi.require-capability>
+    <osgi.provide-capability>
+      osgi.serviceloader;
+      osgi.serviceloader=io.fabric8.kubernetes.client.extension.ExtensionAdapter,
+      io.fabric8.kubernetes.client.ServiceToURLProvider
+    </osgi.provide-capability>
     <osgi.import>
       !org.junit*,
       *