lambda expressions are not supported in -source 1.7 [duplicate]

Question

I have maven project opened in Eclipse. But when I do clean and install, I get above error.

I changed my build path to use SE 1.8 and my compiler is also configured to use 1.8. You can see that in following screen shots.

I am seeing little red crosses in project explorer too. You can see that in following picture.

I am not sure why maven is using SE 1.7 when I have configured it to use 1.8 in Eclipse.

Answer 1

You need to configure maven to use 1.8 compatibility when compiling:

    <build>
      <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <encoding>utf8</encoding>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
     </plugins>
   </build>