Maven打包报错：“请使用 -source 7 或更高版本以启用 diamond 运算符”

>     [INFO] -------------------------------------------------------------
>     [ERROR] COMPILATION ERROR : 
>     [INFO] -------------------------------------------------------------
> -source 1.5 中不支持 diamond 运算符
>       (请使用 -source 7 或更高版本以启用 diamond 运算符)
>     [INFO] 1 error
>     [INFO] -------------------------------------------------------------
>     [INFO] ------------------------------------------------------------------------
>     [INFO] BUILD FAILURE
>     [INFO] ------------------------------------------------------------------------
>     [INFO] Total time: 5.976 s
>     [INFO] Final Memory: 14M/159M
>     [INFO] ------------------------------------------------------------------------
>     [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile
> (default-compile) on project storm-samples: Compilation failure
> -source 1.5 中不支持 diamond 运算符
>     [ERROR] (请使用 -source 7 或更高版本以启用 diamond 运算符)
>     [ERROR] -> [Help 1]
>     [ERROR] 
>     [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
>     [ERROR] Re-run Maven using the -X switch to enable full debug logging.
>     [ERROR] 
>     [ERROR] [Help 1] 

<build>
  <finalName>项目名</finalName>
  <plugins>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-compiler-plugin</artifactId>
      <version>2.3.2</version>  
      <configuration>
        <source>1.7</source>
        <target>1.7</target>
      </configuration>
    </plugin>
  </plugins>
</build>

[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 38.902 s
[INFO] Finished at: 2018-12-01T10:30:58+08:00
[INFO] ------------------------------------------------------------------------