docs(task): 更新任务通信规则文档并添加任务注册描述

添加任务注册信息的描述字段到tasker_mapper.json
完善WebSocket通信机制文档，补充核心组件说明
修正属性同步机制中的空指针问题
优化代码格式和注释

client/src/main/java/com/ecep/contract/WebSocketClientSession.java

@@ -1,20 +1,31 @@
 package com.ecep.contract;
 
-import com.ecep.contract.constant.WebSocketConstant;
-import com.fasterxml.jackson.core.JsonProcessingException;
-import com.fasterxml.jackson.databind.JsonNode;
-import lombok.Getter;
-import org.springframework.beans.BeanUtils;
-
 import java.beans.PropertyDescriptor;
 import java.util.Locale;
 import java.util.Map;
 import java.util.UUID;
 import java.util.logging.Level;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.BeanUtils;
+
+import com.ecep.contract.constant.WebSocketConstant;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.JsonNode;
+
+import lombok.Getter;
+
+/**
+ *
+ */
 public class WebSocketClientSession {
+    private static final Logger logger = LoggerFactory.getLogger(WebSocketClientSession.class);
+    /**
+     * 会话ID由客户端创建，服务器不保存会话只回传会话ID
+     */
     @Getter
-    private String sessionId = UUID.randomUUID().toString();
+    private final String sessionId = UUID.randomUUID().toString();
 
     private WebSocketClientTasker tasker;
 
@@ -90,11 +101,17 @@ public class WebSocketClientSession {
             Object object = webSocketService.getObjectMapper().convertValue(value, descriptor.getPropertyType());
             System.out.println("object = " + object);
             System.out.println("descriptor.getWriteMethod() = " + descriptor.getWriteMethod());
-            System.out.println("descriptor.getWriteMethod().getParameterTypes() = "
-                    + descriptor.getWriteMethod().getParameterTypes());
-            descriptor.getWriteMethod().invoke(tasker, object);
+
+            if (descriptor.getWriteMethod() == null) {
+                tasker.updateMessage(java.util.logging.Level.SEVERE, "属性 " + name + " 不可写");
+            } else {
+                System.out.println("descriptor.getWriteMethod().getParameterTypes() = "
+                        + descriptor.getWriteMethod().getParameterTypes());
+                descriptor.getWriteMethod().invoke(tasker, object);
+            }
         } catch (Exception e) {
             tasker.updateMessage(java.util.logging.Level.SEVERE, "属性设置失败: " + name + " = " + value);
+            logger.error("set {} = {}", name, value, e);
         }
     }