fixes

Author: csviri

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/config/NamespaceChangeable.java

@@ -2,6 +2,8 @@
 
 import java.util.Set;
 
+import static io.javaoperatorsdk.operator.api.reconciler.Constants.DEFAULT_NAMESPACES;
+
 public interface NamespaceChangeable {
 
   /**
@@ -16,7 +18,7 @@ public interface NamespaceChangeable {
 
   default void changeNamespaces(String... namespaces) {
     changeNamespaces(
-        namespaces != null ? Set.of(namespaces) : ResourceConfiguration.DEFAULT_NAMESPACES);
+        namespaces != null ? Set.of(namespaces) : DEFAULT_NAMESPACES);
   }
 
   default boolean allowsNamespaceChanges() {

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/config/informer/InformerConfiguration.java

@@ -10,6 +10,8 @@
 import io.javaoperatorsdk.operator.processing.event.source.SecondaryToPrimaryMapper;
 import io.javaoperatorsdk.operator.processing.event.source.informer.Mappers;
 
+import static io.javaoperatorsdk.operator.api.reconciler.Constants.DEFAULT_NAMESPACES;
+
 public interface InformerConfiguration<R extends HasMetadata>
     extends ResourceConfiguration<R> {
 
@@ -71,7 +73,7 @@ public InformerConfigurationBuilder<R> withSecondaryToPrimaryMapper(
 
     public InformerConfigurationBuilder<R> withNamespaces(String... namespaces) {
       return withNamespaces(
-          namespaces != null ? Set.of(namespaces) : ResourceConfiguration.DEFAULT_NAMESPACES);
+          namespaces != null ? Set.of(namespaces) : DEFAULT_NAMESPACES);
     }
 
     public InformerConfigurationBuilder<R> withNamespaces(Set<String> namespaces) {
@@ -90,7 +92,7 @@ public InformerConfigurationBuilder<R> withNamespaces(Set<String> namespaces) {
      */
     public InformerConfigurationBuilder<R> withNamespaces(Set<String> namespaces,
         boolean followChanges) {
-      this.namespaces = namespaces != null ? namespaces : ResourceConfiguration.DEFAULT_NAMESPACES;
+      this.namespaces = namespaces != null ? namespaces : DEFAULT_NAMESPACES;
       this.inheritControllerNamespacesOnChange = true;
       return this;
     }

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/reconciler/Constants.java

@@ -1,12 +1,14 @@
 package io.javaoperatorsdk.operator.api.reconciler;
 
+import java.util.Collections;
 import java.util.Set;
 
 public final class Constants {
 
-  public static final Set<String> DEFAULT_NAMESPACES = Set.of(Constants.WATCH_ALL_NAMESPACES);
+  public static final Set<String> DEFAULT_NAMESPACES =
+      Collections.singleton(Constants.WATCH_ALL_NAMESPACES);
   public static final Set<String> WATCH_CURRENT_NAMESPACE_SET =
-      Set.of(Constants.WATCH_CURRENT_NAMESPACE);
+      Collections.singleton(Constants.WATCH_CURRENT_NAMESPACE);
 
   public static final String NO_VALUE_SET = "";
   public static final String WATCH_CURRENT_NAMESPACE = "JOSDK_WATCH_CURRENT";