The Java Portlet API version 2.1.0 developed by the Java Community Process JSR-286 Expert Group.
'org.apache.portals:portlet-api_2.1.0_spec:1.0'
<dependency>
<groupId>org.apache.portals</groupId>
<artifactId>portlet-api_2.1.0_spec</artifactId>
<version>1.0</version>
</dependency>
<dependency org="org.apache.portals" name="portlet-api_2.1.0_spec" rev="1.0"/>
"org.apache.portals", "portlet-api_2.1.0_spec", "1.0"