Classes that represent optional values without using null references
'com.timgroup:Functional:1.0'
<dependency> <groupId>com.timgroup</groupId> <artifactId>Functional</artifactId> <version>1.0</version> </dependency>
<dependency org="com.timgroup" name="Functional" rev="1.0"/>
"com.timgroup", "Functional", "1.0"