Lesson 49: Missing import on org.springframework.mail

try downloading .jar file from this web:
http://mvnrepository.com/artifact/org.springframework/spring-context-support/3.2.5.RELEASE

or use maven / pom you can add this in pom.xml:
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>3.2.5.RELEASE</version>
</dependency>