行家。 -source 1.5不支持lambda表达式 [英] maven. lambda expressions are not supported in -source 1.5

问题描述

我使用maven来构建我的项目。

I use maven to build my project.

我有以下配置：

d：\freelance\polyndrom> MVN -verion阿帕奇的Maven 3.2.3
（33f8c3e1027c3ddde99d3cdebad2656a31e8fdf4; 2014-08-12T00：58：1 0 + 04：00）
Maven的家：C ：\Program Files\apache\apache Maven的-3.2.3 Java版本：
1.8.0_25，供应商：Oracle公司的Java家：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，arch：amd64，系列：
dos

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"

但是当我编译项目时，我看到以下错误：

but when I compile project I see following errors:

lambda expressions are not supported in -source 1.5

我很困惑 - mven看到我使用java 8。

I am confused - mven sees that I use java 8.

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>

推荐答案

默认情况下，Maven假设您使用JDK编写代码1.5并且您要编译到同一目标。您需要将maven-compiler-plugin添加到构建插件中，以告诉它使用1.8。

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.

<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>

查看插件的文档以获取更多信息： http://maven.apache.org/plugins/maven-compiler-plugin/compile-mojo.html

Check out the plugin's docs for more info: http://maven.apache.org/plugins/maven-compiler-plugin/compile-mojo.html

这篇关于行家。 -source 1.5不支持lambda表达式的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！