<dependency>
<groupId>org.mnode.ical4j</groupId>
<artifactId>ical4j</artifactId>
<version>3.2.1</version>
</dependency>
compile
|-- org.slf4j:slf4j-api:1.7.32
|-- commons-codec:commons-codec:1.11
|-- org.apache.commons:commons-lang3:3.8.1
|-- org.apache.commons:commons-collections4:4.1
|-- com.sun.mail:javax.mail:1.6.2
runtime
|-- javax.cache:cache-api:1.1.1
|-- org.threeten:threeten-extra:1.5.0
|-- org.codehaus.groovy:groovy:3.0.7