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 构建我的项目.

I use maven to build my project.

我有以下配置:

D:freelancepolyndrom>mvn -verion Apache Maven 3.2.3(33f8c3e1027c3ddde99d3cdebad2656a31e8fdf4; 2014-08-12T00:58:1 0+04:00)Maven 主目录:C:Program Filesapacheapache-maven-3.2.3 Java 版本:1.8.0_25，供应商:Oracle Corporation Java 主页:C:Program FilesJavajdk1.8.0_25jre 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:做"

D:freelancepolyndrom>mvn -verion Apache Maven 3.2.3 (33f8c3e1027c3ddde99d3cdebad2656a31e8fdf4; 2014-08-12T00:58:1 0+04:00) Maven home: C:Program Filesapacheapache-maven-3.2.3 Java version: 1.8.0_25, vendor: Oracle Corporation Java home: C:Program FilesJavajdk1.8.0_25jre 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 看到我使用的是 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.

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>

查看插件文档了解更多信息: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

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