相关疑难解决方法(0)

我见过类似的问题,但还没有找到答案.

使用maven编译,我得到:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.0:compile (default-compile) on project api: Fatal error compiling: invalid target release: 1.7 -> [Help 1]

这是pom.xml:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.0</version>
    <configuration>
        <source>1.7</source>
        <target>1.7</target>
        <encoding>UTF-8</encoding>
    </configuration>
</plugin>

Javac版本:

javac 1.7.0_25

Java版本:

java version "1.7.0_25"
Java(TM) SE Runtime Environment (build 1.7.0_25-b15)
Java HotSpot(TM) 64-Bit Server VM (build 23.25-b01, mixed mode)

知道它可能是什么？

我是Maven和IntelliJ IDEA的新手.

我有一个用Java 8编写的Maven项目.每当我尝试构建它时(Maven Projects窗口 - >生命周期 - >编译 - >运行Maven Build)我得到一系列编译错误:

[ERROR] path/to/file.java:[26,52] lambda expressions are not supported in -source 1.5
(use -source 8 or higher to enable lambda expressions)

我应该在哪里更改-source参数的值？我尝试在Settings - > Compiler - > Java Compiler中添加它作为附加参数,但我得到了相同的结果.

项目和模块的语言级别都设置为8.0.

我正在使用Maven 3.2.3和IntelliJ IDEA Community Edition 13.1.2.

我似乎无法让Maven使用Java 1.8.使用1.8作为目标会出现以下错误:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile
(default-compile) on project csaro: Fatal error compiling: invalid target
release: 1.8 -> [Help 1]

错误的原因很明显:Maven没有使用正确版本的Java:

$ mvn -version
Apache Maven 3.2.2 (45f7c06d68e745d05611f7fd14efb6594181933e; 2014-06-17T07:51:42-06:00)
Maven home: /usr/local/Cellar/maven/3.2.2/libexec
Java version: 1.7.0_51, vendor: Oracle Corporation
Java home: /Library/Java/JavaVirtualMachines/jdk1.7.0_51.jdk/Contents/Home/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "mac os x", version: "10.9.2", arch: "x86_64", family: "mac"

但是安装的Java版本应该是1.8:

$ java -version
java version "1.8.0_20-ea"
Java(TM) SE Runtime Environment (build 1.8.0_20-ea-b22)
Java HotSpot(TM) 64-Bit Server VM (build 25.20-b21, …

我是maven的新手,我发现虽然我将项目的jdk的方面改为1.8,但每次我"更新maven"时,它都会回到jdk 1.6.

这是为什么？

我在我的窗口安装了jdk 1.8,我正在使用eclipse.

我阅读了指定JDK for Maven使用并添加以下内容但它不起作用.

   <plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-enforcer-plugin</artifactId>
  <executions>
    <execution>
      <id>enforce-versions</id>
      <goals>
        <goal>enforce</goal>
      </goals>
      <configuration>
        <rules>
          <requireJavaVersion>
            <version>1.8</version>
          </requireJavaVersion>
        </rules>
      </configuration>
    </execution>
  </executions>
</plugin>

在Eclipse（在Windows 上）中创建的新Maven项目使用默认的 JRE 系统库“J2SE-1.5”。

<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>com.test</groupId>
<artifactId>Test123</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>Test123</name>
<url>http://maven.apache.org</url>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>

<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>3.8.1</version>
        <scope>test</scope>
    </dependency>
</dependencies>