bug

src/main/java/nju/seec/SEECdemo/util/ApplicationProperties.java

@@ -10,6 +10,7 @@ import org.springframework.validation.annotation.Validated;
 import javax.validation.Valid;
 import javax.validation.constraints.Email;
 import javax.validation.constraints.NotEmpty;
+import javax.validation.constraints.NotNull;
 import javax.validation.constraints.Pattern;
 import java.util.HashMap;
 import java.util.Map;
@@ -46,7 +47,7 @@ public class ApplicationProperties {
 		private String webHookProxy = "http://localhost:3000";
 		@NotEmpty
 		private String username = "root";
-		@NotEmpty
+		@NotNull
 		private Integer userId = 1;
 		@NotEmpty
 		private String token;