38. Custom exception classes (#3 Section 5: Custom Exception Handling)

support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/EmailExistsException.java

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+package net.shyshkin.study.fullstack.supportportal.backend.exception.domain;
+
+public class EmailExistsException extends Exception{
+    public EmailExistsException(String message) {
+        super(message);
+    }
+}

support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/EmailNotFoundException.java

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+package net.shyshkin.study.fullstack.supportportal.backend.exception.domain;
+
+public class EmailNotFoundException extends Exception{
+    public EmailNotFoundException(String message) {
+        super(message);
+    }
+}

support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/UserNotFoundException.java

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+package net.shyshkin.study.fullstack.supportportal.backend.exception.domain;
+
+public class UserNotFoundException extends Exception{
+    public UserNotFoundException(String message) {
+        super(message);
+    }
+}

support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/exception/domain/UsernameExistsException.java

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+package net.shyshkin.study.fullstack.supportportal.backend.exception.domain;
+
+public class UsernameExistsException extends Exception{
+    public UsernameExistsException(String message) {
+        super(message);
+    }
+}