Use diamond operator when possible

src/main/java/sh/libre/scim/core/GroupAdapter.java

@@ -20,7 +20,7 @@ import java.util.stream.Stream;
 public class GroupAdapter extends Adapter<GroupModel, Group> {
 
     private String displayName;
-    private Set<String> members = new HashSet<String>();
+    private Set<String> members = new HashSet<>();
 
     public GroupAdapter(KeycloakSession session, String componentId) {
         super(session, componentId, "Group", Logger.getLogger(GroupAdapter.class));
@@ -58,7 +58,7 @@ public class GroupAdapter extends Adapter<GroupModel, Group> {
         setDisplayName(group.getDisplayName().get());
         var groupMembers = group.getMembers();
         if (groupMembers != null && groupMembers.size() > 0) {
-            this.members = new HashSet<String>();
+            this.members = new HashSet<>();
             for (var groupMember : groupMembers) {
                 try {
                     var userMapping = this.query("findByExternalId", groupMember.getValue().get(), "User")

src/main/java/sh/libre/scim/core/UserAdapter.java

@@ -169,7 +169,7 @@ public class UserAdapter extends Adapter<UserModel, User> {
             logger.warn(e);
         }
         user.setMeta(meta);
-        List<PersonRole> roles = new ArrayList<PersonRole>();
+        List<PersonRole> roles = new ArrayList<>();
         for (var r : this.roles) {
             var role = new PersonRole();
             role.setValue(r);
@@ -227,7 +227,7 @@ public class UserAdapter extends Adapter<UserModel, User> {
 
     @Override
     public Stream<UserModel> getResourceStream() {
-        Map<String, String> params = new HashMap<String, String>() {
+        Map<String, String> params = new HashMap<>() {
         };
         return this.session.users().searchForUserStream(realm, params);
     }

src/main/java/sh/libre/scim/event/ScimEventListenerProvider.java

@@ -28,7 +28,7 @@ public class ScimEventListenerProvider implements EventListenerProvider {
 
     private final KeycloakSession session;
 
-    private final Map<ResourceType, Pattern> patterns = new HashMap<ResourceType, Pattern>();
+    private final Map<ResourceType, Pattern> patterns = new HashMap<>();
 
     public ScimEventListenerProvider(KeycloakSession session) {
         this.session = session;