Eclipse Maven | lambda | use -source 8 or Higher to enable lambda Expressions

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Java Maven project in Eclipse neon (4.6.0), simply does not compile when using lambda.

The mistake:

use lambda Expressions are not supported in -source 1.5 (use -source 8 or Higher to enable lambda Expressions)

The detail is I’m using JDK 8:

java version "1.8.0_101" Java(TM) SE Runtime Environment (build 1.8.0_101-B13) Java Hotspot(TM) 64-Bit Server VM (build 25.101-B13, Mixed mode)

Eclipse is also configured correctly according to the images below:

inserir a descrição da imagem aqui inserir a descrição da imagem aqui inserir a descrição da imagem aqui inserir a descrição da imagem aqui Any idea why there’s a lambda error?

java eclipse maven lambda-expressions jdk

1 answer

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The code of your pom.xml should also reference java8. It would look like this:

<build>
    <plugins>
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.0</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
    </plugins>
</build>

  • It worked, but I’d never had to do it, you know why? Thank you.

  • Yes, every time you build the Maven project it changes the version of the java you selected. That’s why you always need to report this in the pom.

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