修复Spring Boot升级带来的报错。

deploy/litemall/application-db.yml

@@ -22,5 +22,5 @@ spring:
       test-on-return:  false
       test-while-idle:  true
       time-between-eviction-runs-millis:  60000
-      filters:  stat,wall,log4j
+      filters:  stat,wall