Merge "spring ver from 5.0.9 to 5.1.2"

diff --cc reference/logging-demo/pom.xml
index c2ee020,4d3a35b..6e4f591
--- 1/reference/logging-demo/pom.xml
--- 2/reference/logging-demo/pom.xml
+++ b/reference/logging-demo/pom.xml
@@@ -9,9 -9,9 +9,9 @@@
    <packaging>war</packaging>
    <name>logging-demo</name>
    <properties>
 -       <jackson-2-version>2.5.1</jackson-2-version>
 +       <jackson-2-version>2.8.6</jackson-2-version>
         <!-- https://mvnrepository.com/artifact/org.springframework/spring-aop/5.0.5.RELEASE -->
-        <spring.version>5.0.9.RELEASE</spring.version>
+        <spring.version>5.1.2.RELEASE</spring.version>
         <logback.version>1.2.3</logback.version>                
    </properties>
    <build>