build: enforce existing Checkstyle rules

client/base/src/main/java/org/a2aproject/sdk/client/Client.java

@@ -118,7 +118,7 @@
  *             case FAILED -> System.err.println("Task failed: " +
  *                 tue.getTask().status().message());
  *         }
- *         
+ *
  *         // Check for new artifacts
  *         if (tue.getUpdateEvent() instanceof TaskArtifactUpdateEvent update) {
  *             Artifact artifact = update.artifact();

client/base/src/main/java/org/a2aproject/sdk/client/ClientBuilder.java

@@ -407,7 +407,7 @@ private ClientTransport wrap(ClientTransport transport, ClientTransportConfig<?
         if (wrappers.isEmpty()) {
             LOGGER.debug("No client transport wrappers found via ServiceLoader");
             return transport;
-        } 
+        }
         LOGGER.debug(wrappers.size() + " client transport wrappers found via ServiceLoader");
 
         // Reverse to apply lowest priority first (building stack with highest priority outermost)

client/base/src/main/java/org/a2aproject/sdk/client/MessageEvent.java

@@ -18,15 +18,15 @@
  * client.addConsumer((event, agentCard) -> {
  *     if (event instanceof MessageEvent me) {
  *         Message msg = me.getMessage();
- *         
+ *
  *         // Extract text content
  *         String text = msg.parts().stream()
  *             .filter(p -> p instanceof TextPart)
  *             .map(p -> ((TextPart) p).text())
  *             .collect(Collectors.joining());
- *         
+ *
  *         System.out.println("Agent response: " + text);
- *         
+ *
  *         // Check for images
  *         msg.parts().stream()
  *             .filter(p -> p instanceof ImagePart)

client/base/src/main/java/org/a2aproject/sdk/client/TaskEvent.java

@@ -25,7 +25,7 @@
  * client.addConsumer((event, agentCard) -> {
  *     if (event instanceof TaskEvent te) {
  *         Task task = te.getTask();
- *         
+ *
  *         // Check task state
  *         TaskState state = task.status().state();
  *         switch (state) {

client/base/src/main/java/org/a2aproject/sdk/client/TaskUpdateEvent.java

@@ -36,12 +36,12 @@
  *     if (event instanceof TaskUpdateEvent tue) {
  *         Task currentTask = tue.getTask();
  *         UpdateEvent update = tue.getUpdateEvent();
- *         
+ *
  *         // Handle status changes
  *         if (update instanceof TaskStatusUpdateEvent statusUpdate) {
  *             TaskState newState = currentTask.status().state();
  *             System.out.println("Task " + currentTask.id() + " → " + newState);
- *             
+ *
  *             if (newState == TaskState.COMPLETED) {
  *                 System.out.println("Final result: " +
  *                     currentTask.artifact().parts());
@@ -50,12 +50,12 @@
  *                     currentTask.status().message());
  *             }
  *         }
- *         
+ *
  *         // Handle new content
  *         if (update instanceof TaskArtifactUpdateEvent artifactUpdate) {
  *             Artifact newContent = artifactUpdate.artifact();
  *             System.out.println("New content received: " + newContent.parts());
- *             
+ *
  *             // For streaming text generation
  *             newContent.parts().stream()
  *                 .filter(p -> p instanceof TextPart)

client/base/src/test/java/org/a2aproject/sdk/A2ATest.java

@@ -19,7 +19,7 @@ public class A2ATest {
     public void testToUserMessage() {
         String text = "Hello, world!";
         Message message = A2A.toUserMessage(text);
-        
+
         assertEquals(Message.Role.ROLE_USER, message.role());
         assertEquals(1, message.parts().size());
         assertEquals(text, ((TextPart) message.parts().get(0)).text());
@@ -33,7 +33,7 @@ public void testToUserMessageWithId() {
         String text = "Hello, world!";
         String messageId = "test-message-id";
         Message message = A2A.toUserMessage(text, messageId);
-        
+
         assertEquals(Message.Role.ROLE_USER, message.role());
         assertEquals(messageId, message.messageId());
     }
@@ -42,7 +42,7 @@ public void testToUserMessageWithId() {
     public void testToAgentMessage() {
         String text = "Hello, I'm an agent!";
         Message message = A2A.toAgentMessage(text);
-        
+
         assertEquals(Message.Role.ROLE_AGENT, message.role());
         assertEquals(1, message.parts().size());
         assertEquals(text, ((TextPart) message.parts().get(0)).text());
@@ -54,7 +54,7 @@ public void testToAgentMessageWithId() {
         String text = "Hello, I'm an agent!";
         String messageId = "agent-message-id";
         Message message = A2A.toAgentMessage(text, messageId);
-        
+
         assertEquals(Message.Role.ROLE_AGENT, message.role());
         assertEquals(messageId, message.messageId());
     }
@@ -64,9 +64,9 @@ public void testCreateUserTextMessage() {
         String text = "User message with context";
         String contextId = "context-123";
         String taskId = "task-456";
-        
+
         Message message = A2A.createUserTextMessage(text, contextId, taskId);
-        
+
         assertEquals(Message.Role.ROLE_USER, message.role());
         assertEquals(contextId, message.contextId());
         assertEquals(taskId, message.taskId());
@@ -80,9 +80,9 @@ public void testCreateUserTextMessage() {
     @Test
     public void testCreateUserTextMessageWithNullParams() {
         String text = "Simple user message";
-        
+
         Message message = A2A.createUserTextMessage(text, null, null);
-        
+
         assertEquals(Message.Role.ROLE_USER, message.role());
         assertNull(message.contextId());
         assertNull(message.taskId());
@@ -95,9 +95,9 @@ public void testCreateAgentTextMessage() {
         String text = "Agent message with context";
         String contextId = "context-789";
         String taskId = "task-012";
-        
+
         Message message = A2A.createAgentTextMessage(text, contextId, taskId);
-        
+
         assertEquals(Message.Role.ROLE_AGENT, message.role());
         assertEquals(contextId, message.contextId());
         assertEquals(taskId, message.taskId());
@@ -114,9 +114,9 @@ public void testCreateAgentPartsMessage() {
         );
         String contextId = "context-parts";
         String taskId = "task-parts";
-        
+
         Message message = A2A.createAgentPartsMessage(parts, contextId, taskId);
-        
+
         assertEquals(Message.Role.ROLE_AGENT, message.role());
         assertEquals(contextId, message.contextId());
         assertEquals(taskId, message.taskId());

client/base/src/test/java/org/a2aproject/sdk/client/AuthenticationAuthorizationTest.java

@@ -45,7 +45,7 @@
 /**
  * Tests for handling HTTP 401 (Unauthorized) and 403 (Forbidden) responses
  * when the client sends streaming and non-streaming messages.
- * 
+ *
  * These tests verify that the client properly fails when the server returns
  * authentication or authorization errors.
  */
@@ -71,7 +71,7 @@ public void setUp() {
                 .contextId("context-1234")
                 .messageId("message-1234")
                 .build();
-        
+
         grpcServerName = InProcessServerBuilder.generateName();
 
         agentCard = AgentCard.builder()