The Apache Commons Collections package contains types that extend and augment the Java Collections Framework.
'org.apache.commons:commons-collections4:4.1'
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-collections4</artifactId>
<version>4.1</version>
</dependency>
<dependency org="org.apache.commons" name="commons-collections4" rev="4.1"/>
"org.apache.commons", "commons-collections4", "4.1"