diamond operator is not supported in -source 1.5 even when compiler version is 1.8

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When packaging my project using maven in intellij idea, it gives below error, also my java compiler version is set on 1.8: diamond operator is not supported in -source 1.5 [ERROR] (use -source 7 or higher to enable diamond operator) I'm really confused, because both java version and compiler version are set with 1.8.

javacompiler maven intellij-idea java
1 Answers

Include the following within your <build> tag of your pom.xml to configure maven to compile with source and target with Java 1.8 :

<plugins>
    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.6.1</version>
        <configuration>
            <source>1.8</source>
            <target>1.8</target>
        </configuration>
    </plugin>
</plugins>
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