missing org.apache.commons.collections.CollectionUtils

Question

I import commons-lang3 as following:

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.4</version>
</dependency>

But I can not found sub package collections in package org.apache.commons.lang3

Answer 1

You will not find it in this jar. Maybe you are looking for the commons-collections artifact:

 <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-collections4</artifactId>
        <version>4.4</version>
   </dependency>

or

<dependency>
    <groupId>commons-collections</groupId>
    <artifactId>commons-collections</artifactId>
    <version>3.2.2</version>
</dependency>

In both of them, you will find the class CollectionUtils. But, in your case, I think the version 3.2.2 will fit better.