diff --git a/spring-cloud-alibaba-sentinel-datasource/src/main/java/org/springframework/cloud/alibaba/sentinel/datasource/config/AbstractDataSourceProperties.java b/spring-cloud-alibaba-sentinel-datasource/src/main/java/org/springframework/cloud/alibaba/sentinel/datasource/config/AbstractDataSourceProperties.java
index 8cfea8919..ba6500bbd 100644
--- a/spring-cloud-alibaba-sentinel-datasource/src/main/java/org/springframework/cloud/alibaba/sentinel/datasource/config/AbstractDataSourceProperties.java
+++ b/spring-cloud-alibaba-sentinel-datasource/src/main/java/org/springframework/cloud/alibaba/sentinel/datasource/config/AbstractDataSourceProperties.java
@@ -4,7 +4,6 @@ import javax.validation.constraints.NotEmpty;
 import javax.validation.constraints.NotNull;
 
 import org.springframework.cloud.alibaba.sentinel.datasource.RuleType;
-import org.springframework.util.Assert;
 
 import com.alibaba.csp.sentinel.datasource.AbstractDataSource;
 import com.alibaba.csp.sentinel.slots.block.authority.AuthorityRuleManager;
@@ -22,7 +21,7 @@ import com.fasterxml.jackson.annotation.JsonIgnore;
  */
 public class AbstractDataSourceProperties {
 
-    @NotEmpty
+	@NotEmpty
 	private String dataType = "json";
 	@NotNull
 	private RuleType ruleType;
diff --git a/spring-cloud-alibaba-sentinel-datasource/src/main/java/org/springframework/cloud/alibaba/sentinel/datasource/config/ApolloDataSourceProperties.java b/spring-cloud-alibaba-sentinel-datasource/src/main/java/org/springframework/cloud/alibaba/sentinel/datasource/config/ApolloDataSourceProperties.java
index aad5ffee7..5ee8f4201 100644
--- a/spring-cloud-alibaba-sentinel-datasource/src/main/java/org/springframework/cloud/alibaba/sentinel/datasource/config/ApolloDataSourceProperties.java
+++ b/spring-cloud-alibaba-sentinel-datasource/src/main/java/org/springframework/cloud/alibaba/sentinel/datasource/config/ApolloDataSourceProperties.java
@@ -12,9 +12,9 @@ import org.springframework.cloud.alibaba.sentinel.datasource.factorybean.ApolloD
  */
 public class ApolloDataSourceProperties extends AbstractDataSourceProperties {
 
-    @NotEmpty
+	@NotEmpty
 	private String namespaceName;
-    @NotEmpty
+	@NotEmpty
 	private String flowRulesKey;
 	private String defaultFlowRuleValue;
 
diff --git a/spring-cloud-alibaba-sentinel-datasource/src/main/java/org/springframework/cloud/alibaba/sentinel/datasource/config/FileDataSourceProperties.java b/spring-cloud-alibaba-sentinel-datasource/src/main/java/org/springframework/cloud/alibaba/sentinel/datasource/config/FileDataSourceProperties.java
index 40dabc661..8f3c32d06 100644
--- a/spring-cloud-alibaba-sentinel-datasource/src/main/java/org/springframework/cloud/alibaba/sentinel/datasource/config/FileDataSourceProperties.java
+++ b/spring-cloud-alibaba-sentinel-datasource/src/main/java/org/springframework/cloud/alibaba/sentinel/datasource/config/FileDataSourceProperties.java
@@ -16,7 +16,7 @@ import org.springframework.util.StringUtils;
  */
 public class FileDataSourceProperties extends AbstractDataSourceProperties {
 
-    @NotEmpty
+	@NotEmpty
 	private String file;
 	private String charset = "utf-8";
 	private long recommendRefreshMs = 3000L;
diff --git a/spring-cloud-alibaba-sentinel-datasource/src/main/java/org/springframework/cloud/alibaba/sentinel/datasource/config/NacosDataSourceProperties.java b/spring-cloud-alibaba-sentinel-datasource/src/main/java/org/springframework/cloud/alibaba/sentinel/datasource/config/NacosDataSourceProperties.java
index f7b63b677..5be00c783 100644
--- a/spring-cloud-alibaba-sentinel-datasource/src/main/java/org/springframework/cloud/alibaba/sentinel/datasource/config/NacosDataSourceProperties.java
+++ b/spring-cloud-alibaba-sentinel-datasource/src/main/java/org/springframework/cloud/alibaba/sentinel/datasource/config/NacosDataSourceProperties.java
@@ -18,10 +18,10 @@ public class NacosDataSourceProperties extends AbstractDataSourceProperties {
 
 	private String serverAddr;
 
-    @NotEmpty
+	@NotEmpty
 	private String groupId;
 
-    @NotEmpty
+	@NotEmpty
 	private String dataId;
 
 	// commercialized usage