diff --git a/pom.xml b/pom.xml
index 89a711c..9c6d38f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -56,8 +56,8 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>3.8.0</version>
                 <configuration>
-                    <source>1.8</source>
-                    <target>1.8</target>
+                    <source>11</source>
+                    <target>11</target>
                     <!-- The semantics of this option are reversed, see MCOMPILER-209. -->
                     <useIncrementalCompilation>false</useIncrementalCompilation>
                     <compilerArgs>
diff --git a/src/main/java/com/zdjizhi/function/DosDetectionFunction.java b/src/main/java/com/zdjizhi/function/DosDetectionFunction.java
index 6662873..4914335 100644
--- a/src/main/java/com/zdjizhi/function/DosDetectionFunction.java
+++ b/src/main/java/com/zdjizhi/function/DosDetectionFunction.java
@@ -312,7 +312,7 @@ public class DosDetectionFunction extends ProcessFunction<DosSketchLog, DosEvent
                         countrySet.add(country);
                     }
                 }
-                countryList = StringUtils.join(countrySet, ", ");
+                countryList = StringUtils.join(countrySet, ",");
                 return countryList;
             } catch (Exception e) {
                 logger.error("{} source IP lists 获取国家失败", sourceIpList, e);