Maven 编译错误:(使用 -source 7 或更高版本来启用菱形运算符)

问题描述：

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

I'm using maven in IntelliJ, JDK1.8, maven 3.2.5. Got compilation error: use -source 7 or higher to enable diamond opera. details are as follows:

  [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?是否还有其他配置可以设置此 -source 级别?似乎它不使用 java 1.8.

Any suggestions? Is there any other configuration to set this -source level? seems it doesn't use java 1.8.

答

检查你的 maven-compiler-plugin 是如何配置的，它应该使用 java 7 或更高版本:

Check how your maven-compiler-plugin is configured, it should use java version 7 or higher:

<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>

要获得更完整的答案，请参阅以下内容.

For a more complete answer see the one below.

Maven 编译错误:(使用 -source 7 或更高版本来启用菱形运算符)

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