set jdk to 1.8

pom.xml

@@ -58,8 +58,6 @@
         <!-- database related -->
         <mybatis-plus.version>3.4.3.4</mybatis-plus.version>
         <druid.version>1.2.8</druid.version>
-        <!-- 5.x for jdk11, 4.x for jdk8-->
-        <hikaricp.version>5.0.0</hikaricp.version>
 
         <!-- dubbo related -->
         <dubbo.version>3.0.4</dubbo.version>
@@ -262,11 +260,7 @@
                     </exclusion>
                 </exclusions>
             </dependency>
-            <dependency>
-                <groupId>com.zaxxer</groupId>
-                <artifactId>HikariCP</artifactId>
-                <version>${hikaricp.version}</version>
-            </dependency>
+
             <!-- apollo -->
             <dependency>
                 <groupId>com.ctrip.framework.apollo</groupId>