java - Maven编译错误: (use -source 7 or higher to enable diamond operator)

Question

我在IntelliJ、JDK1.8、maven 3.2.5中使用maven。出现编译错误:使用 -source 7 或更高版本启用钻石歌剧。详情如下:

  [ERROR] COMPILATION ERROR : 
  [INFO] -------------------------------------------------------------
  [ERROR] TrainingConstructor.java:[31,55] diamond operator is not supported in -source 1.5 (use -source 7 or higher to enable diamond operator)
  [ERROR] DTM.java:[79,21] try-with-resources is not supported in -source 1.5  (use -source 7 or higher to enable try-with-resources)
  [ERROR] ticons.java:[53,44] diamond operator is not supported in -source 1.5  (use -source 7 or higher to enable diamond operator)

有什么建议吗？是否有其他配置来设置此源级别？似乎它不使用java 1.8。

Answer 1

检查您的 maven-compiler-plugin 的配置方式，它应该使用 java 版本 7 或更高版本:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.1</version>
    <configuration>
        <source>1.7</source>
        <target>1.7</target>
    </configuration>
</plugin>

有关更完整的答案，请参阅 the one below .