Solve [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project Maven: Compilation failure: Compilation failure: diamond operator is not supported in -source 1.5 (use -source 7 or higher to enable diamond operator)




In this post we will solve 
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project MavenCompilation failure: Compilation failure:

diamond operator is not supported in -source 1.5
(use -source 7 or higher to enable diamond operator)


Please 
<build> … </build> 

in pom.xml-
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>a</groupId>
  <artifactId>b</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <description>  </description>



    <dependencies>

          <!-- Add dependency -->
          <dependency>
                 <groupId>commons-lang</groupId>
                 <artifactId>commons-lang</artifactId>
                 <version>2.2</version>
          </dependency>

    </dependencies>

  <build>
<plugins>
     <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
         <version>3.5.1</version>
         <configuration>
             <source>1.8</source>
             <target>1.8</target>
         </configuration>
     </plugin>
</plugins>
</build>

</project>



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