diff --git a/src/main/java/com/klaroworks/runtime/exception/BaseException.java b/src/main/java/com/klaroworks/runtime/exception/BaseException.java
new file mode 100644
index 0000000..f7202af
--- /dev/null
+++ b/src/main/java/com/klaroworks/runtime/exception/BaseException.java
@@ -0,0 +1,34 @@
+package com.klaroworks.runtime.exception;
+
+public abstract class BaseException extends RuntimeException {
+    private final ErrorCode errorCode;
+    
+    protected BaseException(ErrorCode errorCode) {
+        super(errorCode.getMessage());
+        this.errorCode = errorCode;
+    }
+    
+    protected BaseException(ErrorCode errorCode, String message) {
+        super(message);
+        this.errorCode = errorCode;
+    }
+    
+    public ErrorCode getErrorCode() { return errorCode; }
+}
+
+class BusinessException extends BaseException {
+    public BusinessException(ErrorCode errorCode) { super(errorCode); }
+    public BusinessException(ErrorCode errorCode, String message) { super(errorCode, message); }
+}
+
+class RoleNotFoundException extends BusinessException {
+    public RoleNotFoundException(Long roleId) {
+        super(ErrorCode.ROLE_NOT_FOUND, String.format("Role not found with id: %d", roleId));
+    }
+}
+
+class DuplicateResourceException extends BusinessException {
+    public DuplicateResourceException(String resourceType, String identifier) {
+        super(ErrorCode.DUPLICATE_ROLE_NAME, String.format("%s '%s' already exists", resourceType, identifier));
+    }
+}