Couldn't import class to Java project

I am trying to import

import org.apache.commons.collections4.trie.PatriciaTrie;

It gives me error that it does not exists. I am using Lucene with Glassfish server.

What should be done to fix that issue?

Solution

If you use any kind of central repository system (Maven, SBT, Ivy, Gradle) in your project you could add this dependency with help of this link

E.g. for Maven it will be -

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-collections4</artifactId>
    <version>4.0</version>
</dependency>

If you don't use it, you should add needed library to classpath manually.