Java 行家。-source 1.5 不支持 lambda 表达式
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maven. lambda expressions are not supported in -source 1.5
提问by gstackoverflow
I use maven to build my project.
我使用 maven 来构建我的项目。
I have following configuration:
我有以下配置：
D:\freelance\polyndrom>mvn -verion Apache Maven 3.2.3 (33f8c3e1027c3ddde99d3cdebad2656a31e8fdf4; 2014-08-12T00:58:1 0+04:00) Maven home: C:\Program Files\apache\apache-maven-3.2.3 Java version: 1.8.0_25, vendor: Oracle Corporation Java home: C:\Program Files\Java\jdk1.8.0_25\jre Default locale: ru_RU, platform encoding: Cp1251 OS name: "windows 7", version: "6.1", arch: "amd64", family: "dos"
D:\freelance\polyndrom>mvn -verion Apache Maven 3.2.3 (33f8c3e1027c3ddde99d3cdebad2656a31e8fdf4; 2014-08-12T00:58:1 0+04:00) Maven 主页: C\3.2\Program Maven 文件\-apachem\ 3 Java 版本：1.8.0_25，供应商：Oracle Corporation Java 主页：C:\Program Files\Java\jdk1.8.0_25\jre 默认语言环境：ru_RU，平台编码：Cp1251 操作系统名称：“windows 7”，版本：“6.1 ", 拱门: "amd64", 家庭: "dos"
but when I compile project I see following errors:
但是当我编译项目时，我看到以下错误：
lambda expressions are not supported in -source 1.5
I am confused - mven sees that I use java 8.
我很困惑 - mven 看到我使用 java 8。
pom.xml:
pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<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>polyndrom</groupId>
<artifactId>polyndrom</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-all</artifactId>
<version>1.8.4</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>com.peterservice.polyndrom.Main</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
</project>
采纳答案by mattweyant
By default, Maven assumes you wrote your code using JDK 1.5 and that you want to compile to that same target. You will need to add the maven-compiler-plugin to your build plugins, in order to tell it to use 1.8.
默认情况下，Maven 假定您使用 JDK 1.5 编写代码并且您希望编译到相同的目标。您需要将 maven-compiler-plugin 添加到您的构建插件中，以便告诉它使用 1.8。
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
Check out the plugin's docs for more info: http://maven.apache.org/plugins/maven-compiler-plugin/compile-mojo.html
查看插件的文档了解更多信息：http: //maven.apache.org/plugins/maven-compiler-plugin/compile-mojo.html
回答by talex
You can specify language version in properties
您可以在属性中指定语言版本
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
回答by Kamil Naja
I found possible solution for IntelliJ.
我找到了 IntelliJ 的可能解决方案。
Go into Project settings(ctrl + shift + alt + s). Then you can change language level into higher version.
进入项目设置（ctrl + shift + alt + s）。然后您可以将语言级别更改为更高版本。
