WW-4510 Upgrade spring plugin dependencies to spring version 4.x

- The Servlet API mocks in Spring Framework 4.x only supports Servlet 3.0 and higher

plugins/json/pom.xml

@@ -97,6 +97,15 @@
             <scope>test</scope>
         </dependency>
 
+        <!-- The Servlet API mocks in Spring Framework 4.x only supports Servlet 3.0 and higher.
+           This is only necessary in tests-->
+        <dependency>
+            <groupId>javax.servlet</groupId>
+            <artifactId>javax.servlet-api</artifactId>
+            <version>3.1.0</version>
+            <scope>test</scope>
+        </dependency>
+
     </dependencies>
     <properties>
     	<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>