It seems that org.apache.commons.collections.CollectionUtils doesn't contain isEmpty() anymore.
Is there any other "common" library, which contains the same functionality?
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2Still there in 4.1: https://commons.apache.org/proper/commons-collections/javadocs/api-release/org/apache/commons/collections4/CollectionUtils.html#isEmpty(java.util.Collection) – Thilo Oct 20 '16 at 11:12
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Are you using Spring ? They have the same utility: http://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/util/CollectionUtils.html – Rodislav Moldovan Oct 20 '16 at 11:17
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How hard is it to write `collection != null && collection.size() == 0` yourself? – OneCricketeer Oct 20 '16 at 11:22
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@cricket_007: Don't call `size()` ! That could be expensive. use `isEmpty()`. – Thilo Oct 20 '16 at 11:23
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@cricket_007 or use `collection.isEmpty()` ;) – Peter Lawrey Oct 20 '16 at 11:23
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@Thilo `isEmpty()` is clearer, few collections are much faster with isEmpty(). – Peter Lawrey Oct 20 '16 at 11:24
1 Answers
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The Problem was the version. Imported was 3.1, isEmpty() is from 3.2 available. Solution:
<dependency>
<groupId>commons-collections</groupId>
<artifactId>commons-collections</artifactId>
<version>3.2.2</version>
</dependency>
LazR
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