Install libportlet-api-2.0-spec-java by entering the following commands in the terminal:
sudo apt update sudo apt install libportlet-api-2.0-spec-java
Description:
Java Portlet Specification V2.0
The Java Portlet API version 2.0 developed by the Java Community Process JSR-286 Expert Group. . Portlets are pluggable user interface components that are managed and displayed in a web portal like Liferay or JBoss Gatein. . Package current source code is taken from Apache Portals project
Homepage: http://portals.apache.org/pluto/portlet-2.0-apidocs/
Version: 1.0-2.1
Section: universe/java