diff --git a/config/checkstyle/checkstyle.xml b/config/checkstyle/checkstyle.xml
index ef582cc..c04721d 100644
--- a/config/checkstyle/checkstyle.xml
+++ b/config/checkstyle/checkstyle.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0"?>
 <!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
-		"http://www.puppycrawl.com/dtds/configuration_1_3.dtd">
+		"https://www.puppycrawl.com/dtds/configuration_1_3.dtd">
 <module name="Checker">
 	<!-- Suppressions -->
 	<module name="SuppressionFilter">
diff --git a/samples/boot/gemfire-with-gfsh-servers/src/main/resources/initializer-cache.xml b/samples/boot/gemfire-with-gfsh-servers/src/main/resources/initializer-cache.xml
index 6025cc2..a94865f 100644
--- a/samples/boot/gemfire-with-gfsh-servers/src/main/resources/initializer-cache.xml
+++ b/samples/boot/gemfire-with-gfsh-servers/src/main/resources/initializer-cache.xml
@@ -2,7 +2,7 @@
 <!-- tag::cache-xml[] -->
 <cache xmlns="http://geode.apache.org/schema/cache"
 	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	   xsi:schemaLocation="http://geode.apache.org/schema/cache http://geode.apache.org/schema/cache/cache-1.0.xsd"
+	   xsi:schemaLocation="http://geode.apache.org/schema/cache https://geode.apache.org/schema/cache/cache-1.0.xsd"
 	   version="1.0">
 
 	<initializer>
diff --git a/samples/xml/gemfire-clientserver/src/main/resources/META-INF/spring/session-server.xml b/samples/xml/gemfire-clientserver/src/main/resources/META-INF/spring/session-server.xml
index 37d61cd..779d54e 100644
--- a/samples/xml/gemfire-clientserver/src/main/resources/META-INF/spring/session-server.xml
+++ b/samples/xml/gemfire-clientserver/src/main/resources/META-INF/spring/session-server.xml
@@ -6,10 +6,10 @@
 	   xmlns:util="http://www.springframework.org/schema/util"
 	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	   xsi:schemaLocation="
-	   	http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
-		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
-        http://www.springframework.org/schema/gemfire http://www.springframework.org/schema/gemfire/spring-gemfire.xsd
-		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd
+	   	http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
+		http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd
+        http://www.springframework.org/schema/gemfire https://www.springframework.org/schema/gemfire/spring-gemfire.xsd
+		http://www.springframework.org/schema/util https://www.springframework.org/schema/util/spring-util.xsd
 ">
 
 	<!-- tag::beans[] -->
diff --git a/samples/xml/gemfire-clientserver/src/main/webapp/WEB-INF/spring/session-client.xml b/samples/xml/gemfire-clientserver/src/main/webapp/WEB-INF/spring/session-client.xml
index fcf1f65..01c5979 100644
--- a/samples/xml/gemfire-clientserver/src/main/webapp/WEB-INF/spring/session-client.xml
+++ b/samples/xml/gemfire-clientserver/src/main/webapp/WEB-INF/spring/session-client.xml
@@ -6,10 +6,10 @@
 	   xmlns:util="http://www.springframework.org/schema/util"
 	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	   xsi:schemaLocation="
-	   	http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
-		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
-        http://www.springframework.org/schema/gemfire http://www.springframework.org/schema/gemfire/spring-gemfire.xsd
-		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd
+	   	http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
+		http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd
+        http://www.springframework.org/schema/gemfire https://www.springframework.org/schema/gemfire/spring-gemfire.xsd
+		http://www.springframework.org/schema/util https://www.springframework.org/schema/util/spring-util.xsd
 ">
 
 	<!-- tag::beans[] -->
diff --git a/samples/xml/gemfire-clientserver/src/main/webapp/WEB-INF/web.xml b/samples/xml/gemfire-clientserver/src/main/webapp/WEB-INF/web.xml
index 1db17d0..9cc8658 100644
--- a/samples/xml/gemfire-clientserver/src/main/webapp/WEB-INF/web.xml
+++ b/samples/xml/gemfire-clientserver/src/main/webapp/WEB-INF/web.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
 		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-		xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
+		xsi:schemaLocation="http://java.sun.com/xml/ns/javaee https://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
 	<!--
 	- Location of the XML file that defines the root application context
 	- Applied by ContextLoaderListener.
diff --git a/samples/xml/gemfire-p2p/src/main/webapp/WEB-INF/spring/session.xml b/samples/xml/gemfire-p2p/src/main/webapp/WEB-INF/spring/session.xml
index 14930b6..69c15f5 100644
--- a/samples/xml/gemfire-p2p/src/main/webapp/WEB-INF/spring/session.xml
+++ b/samples/xml/gemfire-p2p/src/main/webapp/WEB-INF/spring/session.xml
@@ -6,10 +6,10 @@
 	   xmlns:util="http://www.springframework.org/schema/util"
 	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	   xsi:schemaLocation="
-	   	http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
-		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
-        http://www.springframework.org/schema/gemfire http://www.springframework.org/schema/gemfire/spring-gemfire.xsd
-		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd
+	   	http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
+		http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd
+        http://www.springframework.org/schema/gemfire https://www.springframework.org/schema/gemfire/spring-gemfire.xsd
+		http://www.springframework.org/schema/util https://www.springframework.org/schema/util/spring-util.xsd
 ">
 
 	<!-- tag::beans[] -->
diff --git a/samples/xml/gemfire-p2p/src/main/webapp/WEB-INF/web.xml b/samples/xml/gemfire-p2p/src/main/webapp/WEB-INF/web.xml
index fd09adf..dfe804f 100644
--- a/samples/xml/gemfire-p2p/src/main/webapp/WEB-INF/web.xml
+++ b/samples/xml/gemfire-p2p/src/main/webapp/WEB-INF/web.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
 		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-		xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
+		xsi:schemaLocation="http://java.sun.com/xml/ns/javaee https://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
 	<!--
 	- Location of the XML file that defines the root application context
 	- Applied by ContextLoaderListener.
diff --git a/spring-session-data-geode/src/test/resources/org/springframework/session/data/gemfire/config/annotation/web/http/GemFireHttpSessionXmlConfigurationTests-context.xml b/spring-session-data-geode/src/test/resources/org/springframework/session/data/gemfire/config/annotation/web/http/GemFireHttpSessionXmlConfigurationTests-context.xml
index 4ec2fdf..ea1567d 100644
--- a/spring-session-data-geode/src/test/resources/org/springframework/session/data/gemfire/config/annotation/web/http/GemFireHttpSessionXmlConfigurationTests-context.xml
+++ b/spring-session-data-geode/src/test/resources/org/springframework/session/data/gemfire/config/annotation/web/http/GemFireHttpSessionXmlConfigurationTests-context.xml
@@ -5,9 +5,9 @@
 	   xmlns:util="http://www.springframework.org/schema/util"
 	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	   xsi:schemaLocation="
-	   	http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
-        http://www.springframework.org/schema/gemfire http://www.springframework.org/schema/gemfire/spring-gemfire.xsd
-        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd
+	   	http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
+        http://www.springframework.org/schema/gemfire https://www.springframework.org/schema/gemfire/spring-gemfire.xsd
+        http://www.springframework.org/schema/util https://www.springframework.org/schema/util/spring-util.xsd
 ">
 
 	<util:properties id="gemfireProperties">