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Java static code analysis

Unique rules to find Bugs, Vulnerabilities, Security Hotspots, and Code Smells in your JAVA code

Java features should be preferred to Guava

consistency - conventional

maintainability

Code Smell

MajorSonarSource default severity
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Why is this an issue?

Some Guava features were really useful for Java 7 application because Guava was bringing APIs missing in the JDK. Java 8 fixed some of these limitations. When migrating an application to Java 8 or even when starting a new one, it’s recommended to prefer Java 8 APIs over Guava ones to ease its maintenance: developers don’t need to learn how to use two APIs and can stick to the standard one.

Java 9 brought even more useful methods to the standard Java library and if Java version is equal to or higher than 9, these standard methods should be used.

This rule raises an issue when the following Guava APIs are used:

Guava API	Java 8 API
com.google.common.io.BaseEncoding#base64()	java.util.Base64
com.google.common.io.BaseEncoding#base64Url()	java.util.Base64
com.google.common.base.Joiner.on()	java.lang.String#join() or java.util.stream.Collectors#joining()
com.google.common.base.Optional#of()	java.util.Optional#of()
com.google.common.base.Optional#absent()	java.util.Optional#empty()
com.google.common.base.Optional#fromNullable()	java.util.Optional#ofNullable()
com.google.common.base.Optional	java.util.Optional
com.google.common.base.Predicate	java.util.function.Predicate
com.google.common.base.Function	java.util.function.Function
com.google.common.base.Supplier	java.util.function.Supplier
com.google.common.io.Files.createTempDir	java.nio.file.Files.createTempDirectory

Guava API	Java 9 API
com.google.common.collect.ImmutableSet#of()	java.util.Set#of()
com.google.common.collect.ImmutableList#of()	java.util.List#of()
com.google.common.collect.ImmutableMap#of()	java.util.Map#of() or java.util.Map#ofEntries()

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