diff --git a/Java/Spring/activitypubbot/src/main/java/dev/activitypub/activitypubbot/BotNotFoundByUsernameException.java b/Java/Spring/activitypubbot/src/main/java/dev/activitypub/activitypubbot/BotNotFoundByUsernameException.java
new file mode 100644
index 0000000..31b0c93
--- /dev/null
+++ b/Java/Spring/activitypubbot/src/main/java/dev/activitypub/activitypubbot/BotNotFoundByUsernameException.java
@@ -0,0 +1,11 @@
+package dev.activitypub.activitypubbot;
+
+public class BotNotFoundByUsernameException extends RuntimeException {
+ public BotNotFoundByUsernameException() {
+ super();
+ }
+
+ public BotNotFoundByUsernameException(String message) {
+ super(message);
+ }
+}
diff --git a/Java/Spring/activitypubbot/src/main/resources/templates/user_not_found.html b/Java/Spring/activitypubbot/src/main/resources/templates/user_not_found.html
new file mode 100644
index 0000000..7645049
--- /dev/null
+++ b/Java/Spring/activitypubbot/src/main/resources/templates/user_not_found.html
@@ -0,0 +1,11 @@
+
+
+
+
+Spring Bot - 404
+
+
+ 404
+ User not found: [[${message}]]
+
+