fix: add EdaException and unified exception hierarchy

- Add EdaException extending FireflyInfrastructureException
- Add fireflyframework-kernel dependency

Author: ancongui

pom.xml

@@ -15,6 +15,13 @@
     <description>Unified Event-Driven Architecture library providing standardized messaging abstractions and implementations</description>
 
     <dependencies>
+        <!-- Firefly Kernel (exception hierarchy, shared abstractions) -->
+        <dependency>
+            <groupId>org.fireflyframework</groupId>
+            <artifactId>fireflyframework-kernel</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+
         <!-- Spring Boot -->
         <dependency>
             <groupId>org.springframework.boot</groupId>

src/main/java/org/fireflyframework/eda/exception/EdaException.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2024-2026 Firefly Software Solutions Inc
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.fireflyframework.eda.exception;
+
+import org.fireflyframework.kernel.exception.FireflyInfrastructureException;
+
+/**
+ * Base exception for all EDA (Event-Driven Architecture) related errors.
+ */
+public class EdaException extends FireflyInfrastructureException {
+
+    public EdaException(String message) {
+        super(message);
+    }
+
+    public EdaException(Throwable cause) {
+        super(cause);
+    }
+
+    public EdaException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public EdaException(String message, String errorCode) {
+        super(message, errorCode);
+    }
+
+    public EdaException(String message, String errorCode, Throwable cause) {
+        super(message, errorCode, cause);
+    }
+}

src/main/java/org/fireflyframework/eda/serialization/SerializationException.java

@@ -16,10 +16,12 @@
 
 package org.fireflyframework.eda.serialization;
 
+import org.fireflyframework.eda.exception.EdaException;
+
 /**
  * Exception thrown when serialization fails.
  */
-public class SerializationException extends Exception {
+public class SerializationException extends EdaException {
 
     public SerializationException(String message) {
         super(message);