Use one version, for easier upgrade

Author: mlvandijk

examples/osgi/apache-karaf-feature/pom.xml

@@ -12,26 +12,32 @@
     <artifactId>graphql-java-servlet-osgi-examples-karaf-feature</artifactId>
     <packaging>feature</packaging>
 
+    <properties>
+        <jackson.version>2.9.8</jackson.version>
+    </properties>
+
+
+
     <dependencies>
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-core</artifactId>
-            <version>2.9.8</version>
+            <version>${jackson.version}</version>
         </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-annotations</artifactId>
-            <version>2.9.8</version>
+            <version>${jackson.version}</version>
         </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-databind</artifactId>
-            <version>2.9.8</version>
+            <version>${jackson.version}</version>
         </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.datatype</groupId>
             <artifactId>jackson-datatype-jdk8</artifactId>
-            <version>2.9.8</version>
+            <version>${jackson.version}</version>
         </dependency>
         <dependency>
             <groupId>com.google.guava</groupId>