This is a pom artifact to pull in ehcache-core and ehcache-terracotta for clustering. Make sure to set 'type' to 'pom' in your dependency.
'net.sf.ehcache:ehcache:2.6.2'
<dependency>
<groupId>net.sf.ehcache</groupId>
<artifactId>ehcache</artifactId>
<version>2.6.2</version>
</dependency>
<dependency org="net.sf.ehcache" name="ehcache" rev="2.6.2"/>
"net.sf.ehcache", "ehcache", "2.6.2"