diff --git a/config/application.properties b/config/application.properties
index 0311b28..37d655b 100644
--- a/config/application.properties
+++ b/config/application.properties
@@ -19,7 +19,7 @@ spring.jpa.hibernate.ddl-auto=update
 # mysql默认配置
 # mysql需要手动创建数据库，mysql命令行下执行 create database appdata; appdata可以换为别的库名，但注意不能使用IM服务器使用的数据库"wfchat"，否则会引起冲突。
 ##*********************** mysql DB begin *************************
-#spring.datasource.url=jdbc:mysql://localhost:3306/appdata?serverTimezone=UTC&useSSL=false
+#spring.datasource.url=jdbc:mysql://localhost:3306/appdata?serverTimezone=UTC&allowPublicKeyRetrieval=true&useSSL=false
 #spring.datasource.username=root
 #spring.datasource.password=123456
 #spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
diff --git a/src/main/java/cn/wildfirechat/app/jpa/Announcement.java b/src/main/java/cn/wildfirechat/app/jpa/Announcement.java
index 4a56883..25263be 100755
--- a/src/main/java/cn/wildfirechat/app/jpa/Announcement.java
+++ b/src/main/java/cn/wildfirechat/app/jpa/Announcement.java
@@ -11,6 +11,7 @@ public class Announcement {
 
 	private String author;
 
+	@Column(length = 2048)
 	private String announcement;
 
 	private long timestamp;
diff --git a/src/main/java/cn/wildfirechat/app/jpa/FavoriteItem.java b/src/main/java/cn/wildfirechat/app/jpa/FavoriteItem.java
index 6450073..6061a01 100755
--- a/src/main/java/cn/wildfirechat/app/jpa/FavoriteItem.java
+++ b/src/main/java/cn/wildfirechat/app/jpa/FavoriteItem.java
@@ -15,7 +15,7 @@ public class FavoriteItem {
     @Nullable
     public Long messageUid;
 
-    @Column(name = "user_id")
+    @Column(name = "user_id", length = 64)
 	public String userId;
 
     @Column(name = "type")