Replace Arrays.asList() (with 1 arg) with Collections.singletonList().

(for performance reasons)

src/java/org/jivesoftware/openfire/commands/admin/GetListActiveUsers.java

@@ -119,7 +119,7 @@ public class GetListActiveUsers extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/admin/GetUsersPresence.java

@@ -29,8 +29,8 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
-import java.util.Arrays;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.List;
 
 /**
@@ -119,7 +119,7 @@ public class GetUsersPresence extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/admin/PacketsNotification.java

@@ -28,7 +28,7 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
-import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
 /**
@@ -124,7 +124,7 @@ public class PacketsNotification extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/admin/group/AddGroup.java

@@ -19,10 +19,6 @@
 
 package org.jivesoftware.openfire.commands.admin.group;
 
-import java.util.Arrays;
-import java.util.Collection;
-import java.util.List;
-
 import org.dom4j.Element;
 import org.jivesoftware.openfire.commands.AdHocCommand;
 import org.jivesoftware.openfire.commands.SessionData;
@@ -35,6 +31,10 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
 /**
  * Command that allows to create and configure new goups.
  *
@@ -188,7 +188,7 @@ public class AddGroup extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(AdHocCommand.Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/admin/group/AddGroupUsers.java

@@ -19,10 +19,6 @@
 
 package org.jivesoftware.openfire.commands.admin.group;
 
-import java.util.Arrays;
-import java.util.Collection;
-import java.util.List;
-
 import org.dom4j.Element;
 import org.jivesoftware.openfire.commands.AdHocCommand;
 import org.jivesoftware.openfire.commands.SessionData;
@@ -35,6 +31,10 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
 /**
  * Command that allows to add members or admins to a given group.
  *
@@ -130,7 +130,7 @@ public class AddGroupUsers extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(AdHocCommand.Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/admin/group/DeleteGroup.java

@@ -28,7 +28,7 @@ import org.jivesoftware.openfire.group.GroupNotFoundException;
 import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 
-import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
 /**
@@ -98,7 +98,7 @@ public class DeleteGroup extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(AdHocCommand.Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/admin/group/DeleteGroupUsers.java

@@ -19,9 +19,6 @@
 
 package org.jivesoftware.openfire.commands.admin.group;
 
-import java.util.Arrays;
-import java.util.List;
-
 import org.dom4j.Element;
 import org.jivesoftware.openfire.commands.AdHocCommand;
 import org.jivesoftware.openfire.commands.SessionData;
@@ -34,6 +31,9 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
+import java.util.Collections;
+import java.util.List;
+
 /**
  * Command that allows to delete members or admins from a given group.
  *
@@ -119,7 +119,7 @@ public class DeleteGroupUsers extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(AdHocCommand.Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/admin/group/GetListGroupUsers.java

@@ -29,7 +29,7 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
-import java.util.Arrays;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -110,7 +110,7 @@ public class GetListGroupUsers extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(AdHocCommand.Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/admin/group/GetListGroups.java

@@ -28,7 +28,7 @@ import org.jivesoftware.openfire.roster.RosterManager;
 import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 
-import java.util.Arrays;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -155,7 +155,7 @@ public class GetListGroups extends AdHocCommand {
 
     @Override
 	protected List<AdHocCommand.Action> getActions(SessionData data) {
-        return Arrays.asList(AdHocCommand.Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/admin/group/UpdateGroup.java

@@ -28,7 +28,12 @@ import org.jivesoftware.openfire.group.GroupNotFoundException;
 import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.StringTokenizer;
 
 /**
  * Command that allows to update a given group.
@@ -213,12 +218,12 @@ public class UpdateGroup extends AdHocCommand {
     @Override
 	protected List<Action> getActions(SessionData data) {
         if (data.getStage() == 0) {
-            return Arrays.asList(AdHocCommand.Action.next);
+            return Collections.singletonList(Action.next);
         }
         else if (data.getStage() == 1) {
             return Arrays.asList(AdHocCommand.Action.next, AdHocCommand.Action.prev, AdHocCommand.Action.complete);
         }
-        return Arrays.asList(AdHocCommand.Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/admin/muc/CreateMUCRoom.java

@@ -30,8 +30,8 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
-import java.util.Arrays;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 
@@ -167,7 +167,7 @@ public class CreateMUCRoom extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(AdHocCommand.Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/admin/user/AddUser.java

@@ -31,7 +31,7 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
-import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 
@@ -168,7 +168,7 @@ public class AddUser extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(AdHocCommand.Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/admin/user/AuthenticateUser.java

@@ -22,9 +22,9 @@ package org.jivesoftware.openfire.commands.admin.user;
 import org.dom4j.Element;
 import org.jivesoftware.openfire.XMPPServer;
 import org.jivesoftware.openfire.auth.AuthFactory;
-import org.jivesoftware.openfire.auth.UnauthorizedException;
 import org.jivesoftware.openfire.auth.ConnectionException;
 import org.jivesoftware.openfire.auth.InternalUnauthenticatedException;
+import org.jivesoftware.openfire.auth.UnauthorizedException;
 import org.jivesoftware.openfire.commands.AdHocCommand;
 import org.jivesoftware.openfire.commands.SessionData;
 import org.jivesoftware.openfire.component.InternalComponentManager;
@@ -35,7 +35,7 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
-import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
 /**
@@ -142,7 +142,7 @@ public class AuthenticateUser extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(AdHocCommand.Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/admin/user/ChangeUserPassword.java

@@ -30,7 +30,7 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
-import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
 /**
@@ -118,7 +118,7 @@ public class ChangeUserPassword extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(AdHocCommand.Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/admin/user/DeleteUser.java

@@ -19,10 +19,6 @@
  */
 package org.jivesoftware.openfire.commands.admin.user;
 
-import java.util.Arrays;
-import java.util.List;
-import java.util.Map;
-
 import org.dom4j.Element;
 import org.jivesoftware.openfire.XMPPServer;
 import org.jivesoftware.openfire.commands.AdHocCommand;
@@ -35,6 +31,10 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
 /**
  * Delete a user from Openfire if the provider is not read-only. See
  * <a href="http://www.xmpp.org/extensions/xep-0133.html#delete-user">Service Administration:
@@ -122,7 +122,7 @@ public class DeleteUser extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(AdHocCommand.Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/admin/user/UserProperties.java

@@ -19,17 +19,17 @@
  */
 package org.jivesoftware.openfire.commands.admin.user;
 
+import org.dom4j.Element;
 import org.jivesoftware.openfire.commands.AdHocCommand;
 import org.jivesoftware.openfire.commands.SessionData;
-import org.jivesoftware.openfire.user.UserManager;
 import org.jivesoftware.openfire.user.User;
-import org.dom4j.Element;
+import org.jivesoftware.openfire.user.UserManager;
 import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
+import java.util.Collections;
 import java.util.List;
-import java.util.Arrays;
 
 /**
  *  An adhoc command to retrieve the properties of the user.
@@ -120,7 +120,7 @@ public class UserProperties extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(AdHocCommand.Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/clearspace/ChangeSharedSecret.java

@@ -28,7 +28,7 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
-import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 
@@ -122,7 +122,7 @@ public class ChangeSharedSecret extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/clearspace/SystemAdminAdded.java

@@ -16,18 +16,18 @@
 
 package org.jivesoftware.openfire.commands.clearspace;
 
+import org.dom4j.Element;
+import org.jivesoftware.openfire.admin.AdminManager;
 import org.jivesoftware.openfire.commands.AdHocCommand;
 import org.jivesoftware.openfire.commands.SessionData;
-import org.jivesoftware.openfire.admin.AdminManager;
 import org.jivesoftware.openfire.component.InternalComponentManager;
-import org.dom4j.Element;
 import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
+import java.util.Collections;
 import java.util.List;
 import java.util.Map;
-import java.util.Arrays;
 
 /**
  * Notifies that a new system administrator has been added.
@@ -98,7 +98,7 @@ public class SystemAdminAdded extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/clearspace/SystemAdminRemoved.java

@@ -16,18 +16,18 @@
 
 package org.jivesoftware.openfire.commands.clearspace;
 
+import org.dom4j.Element;
+import org.jivesoftware.openfire.admin.AdminManager;
 import org.jivesoftware.openfire.commands.AdHocCommand;
 import org.jivesoftware.openfire.commands.SessionData;
-import org.jivesoftware.openfire.admin.AdminManager;
 import org.jivesoftware.openfire.component.InternalComponentManager;
-import org.dom4j.Element;
 import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
+import java.util.Collections;
 import java.util.List;
 import java.util.Map;
-import java.util.Arrays;
 
 /**
  * Notifies that a user has had its system administrator status revoked.
@@ -98,7 +98,7 @@ public class SystemAdminRemoved extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/event/GroupAdminAdded.java

@@ -31,7 +31,7 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
-import java.util.Arrays;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -140,7 +140,7 @@ public class GroupAdminAdded extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/event/GroupAdminRemoved.java

@@ -32,6 +32,7 @@ import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -140,7 +141,7 @@ public class GroupAdminRemoved extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/event/GroupCreated.java

@@ -31,7 +31,6 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
-import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
@@ -117,7 +116,7 @@ public class GroupCreated extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/event/GroupDeleting.java

@@ -31,7 +31,6 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
-import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
@@ -117,7 +116,7 @@ public class GroupDeleting extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/event/GroupMemberAdded.java

@@ -31,7 +31,7 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
-import java.util.Arrays;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -140,7 +140,7 @@ public class GroupMemberAdded extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/event/GroupMemberRemoved.java

@@ -31,7 +31,7 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
-import java.util.Arrays;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -140,7 +140,7 @@ public class GroupMemberRemoved extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/event/GroupModified.java

@@ -31,7 +31,7 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
-import java.util.Arrays;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -188,7 +188,7 @@ public class GroupModified extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/event/UserCreated.java

@@ -31,7 +31,6 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
-import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
@@ -118,7 +117,7 @@ public class UserCreated extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/event/UserDeleting.java

@@ -31,7 +31,6 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
-import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
@@ -115,7 +114,7 @@ public class UserDeleting extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/event/UserModified.java

@@ -31,7 +31,7 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
-import java.util.Arrays;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -194,7 +194,7 @@ public class UserModified extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/event/VCardCreated.java

@@ -29,7 +29,7 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
-import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 
@@ -112,7 +112,7 @@ public class VCardCreated extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/event/VCardDeleting.java

@@ -29,7 +29,7 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
-import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 
@@ -112,7 +112,7 @@ public class VCardDeleting extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/commands/event/VCardModified.java

@@ -29,7 +29,7 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
-import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 
@@ -112,7 +112,7 @@ public class VCardModified extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/handler/IQOfflineMessagesHandler.java

@@ -20,13 +20,6 @@
 
 package org.jivesoftware.openfire.handler;
 
-import java.text.ParseException;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Date;
-import java.util.Iterator;
-import java.util.List;
-
 import org.dom4j.DocumentHelper;
 import org.dom4j.Element;
 import org.jivesoftware.openfire.IQHandlerInfo;
@@ -52,6 +45,13 @@ import org.xmpp.packet.IQ;
 import org.xmpp.packet.JID;
 import org.xmpp.packet.PacketError;
 
+import java.text.ParseException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Date;
+import java.util.Iterator;
+import java.util.List;
+
 /**
  * Implements JEP-0013: Flexible Offline Message Retrieval. Allows users to request number of
  * messages, request message headers, retrieve specific messages, remove specific messages,
@@ -156,7 +156,7 @@ public class IQOfflineMessagesHandler extends IQHandler implements ServerFeature
     }
 
     public Iterator<String> getFeatures(String name, String node, JID senderJID) {
-        return Arrays.asList(NAMESPACE).iterator();
+        return Collections.singletonList(NAMESPACE).iterator();
     }
 
     public DataForm getExtendedInfo(String name, String node, JID senderJID) {

src/java/org/jivesoftware/openfire/pubsub/PendingSubscriptionsCommand.java

@@ -27,7 +27,7 @@ import org.xmpp.forms.DataForm;
 import org.xmpp.forms.FormField;
 import org.xmpp.packet.JID;
 
-import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
 /**
@@ -120,7 +120,7 @@ public class PendingSubscriptionsCommand extends AdHocCommand {
 
     @Override
 	protected List<Action> getActions(SessionData data) {
-        return Arrays.asList(Action.complete);
+        return Collections.singletonList(Action.complete);
     }
 
     @Override

src/java/org/jivesoftware/openfire/pubsub/PubSubEngine.java

@@ -20,17 +20,6 @@
 
 package org.jivesoftware.openfire.pubsub;
 
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.HashSet;
-import java.util.Iterator;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
-import java.util.concurrent.ConcurrentHashMap;
-
 import org.dom4j.DocumentHelper;
 import org.dom4j.Element;
 import org.dom4j.QName;
@@ -53,9 +42,18 @@ import org.xmpp.packet.IQ;
 import org.xmpp.packet.JID;
 import org.xmpp.packet.Message;
 import org.xmpp.packet.PacketError;
-import org.xmpp.packet.PacketError.Condition;
 import org.xmpp.packet.Presence;
 
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+
 /**
  * A PubSubEngine is responsible for handling packets sent to a pub-sub service.
  *
@@ -1841,7 +1839,7 @@ public class PubSubEngine {
                 return Collections.emptyList();
             }
             // User is connected at specified resource so answer list with presence show value
-            return Arrays.asList(show);
+            return Collections.singletonList(show);
         }
     }