!2 Fix build errors

From: @wang_yue111
Reviewed-by: @small_leek
Signed-off-by: @small_leek

json-lib.spec

@@ -1,6 +1,6 @@
 Name:           json-lib
 Version:        2.4
-Release:        16
+Release:        17
 Summary:        JSON library for Java
 License:        ASL 2.0
 URL:            http://json-lib.sourceforge.net/
@@ -74,7 +74,7 @@ cd -
 
 %build
 %mvn_file : json-lib
-%mvn_build -- -Dproject.build.sourceEncoding=UTF-8
+%mvn_build -f -- -Dproject.build.sourceEncoding=UTF-8
 
 cd jenkins-json-lib-%{version}
 %mvn_build -f
@@ -97,5 +97,8 @@ cd -
 %license LICENSE.txt
 
 %changelog
+* Mon Sep 14 2020 wangyue <wangyue92@huawei.com> - 2.4-17
+- Fix build errors
+
 * Sat Mar 07 2020 daiqianwen <daiqianwen@huawei.com> - 2.4-16
 - Package init