update pom

pom.xml

@@ -33,6 +33,10 @@
         <spring-boot.version>2.4.5</spring-boot.version>
         <swagger.version>2.9.2</swagger.version>
         <fastjson.version>1.2.75</fastjson.version>
+        <java.version>1.8</java.version>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
     <dependencies>
         <dependency>