Maven没有使用Java11-编译错误：无效的目标版本：11

Question

我正在尝试用Java11编译我的项目。

我尝试用各种方法来修复它，比如更改环境变量，更新路径，将%JAVA_HOME%指向Java11。

我的计算机上的命令及其结果如下：

> java -version
java version "11.0.8" 2020-07-14 LTS
> echo %JAVA_HOME%
C:\Program Files\Java\jdk-11.0.8

我正在使用IntelliJ IDEA，并按照本教程中的建议进行了必要的更改。

我的pom.xml看起来如下所示：

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>11</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>com.google.cloud.tools</groupId>
                <artifactId>appengine-maven-plugin</artifactId>
                <version>2.2.0</version>
                <configuration>
                    <version>1</version>
                    <projectId>businessapplication-6963d</projectId>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.0</version>
                <configuration>
                    <source>11</source>
                    <target>11</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

mvn --version
Java version: 1.8.0_241, vendor: Oracle Corporation, runtime: C:\Program Files\Java\jdk1.8.0_241\jre

我如何将Maven指向Java11？或者，如果这不是问题所在，如何解决这一问题？我不认为这个问题是无效目标版本：1.7的重复，因为我已经实现了那个线程中提供的解决方案。

生成项目后出错

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile (default-compile) on project demo: Fatal error compiling: invalid target release: 11 -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

Path Environment Variable is :- 
C:\Program Files (x86)\Common Files\Intel\Shared Files\cpp\bin\Intel64;
C:\Program Files (x86)\Intel\iCLS Client\;
C:\Program Files\Intel\iCLS Client\;
C:\WINDOWS\system32;C:\WINDOWS;
C:\WINDOWS\System32\Wbem;
C:\WINDOWS\System32\WindowsPowerShell\v1.0\;
C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;
C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;
C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;
C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\WINDOWS\System32\OpenSSH\;
C:\Delhi 2.0\apache-maven-3.6.1\bin;
C:\Program Files\Java\jdk-11.0.8\bin;C:\Program Files\Intel\WiFi\bin\;
C:\Program Files\Common Files\Intel\WirelessCommon\;
C:\Program Files\Git\cmd;D:\Flutter\flutter\flutter\bin;
C:\Users\Infinity97\AppData\Local\Google\Cloud SDK\google-cloud-sdk\bin;
C:\Users\Infinity97\AppData\Local\Microsoft\WindowsApps;
C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2019.2\bin;
H:\apache-maven-3.6.3\bin;
C:\Program Files\PostgreSQL\12\bin;
C:\Program Files\PostgreSQL\12\lib;
C:\Program Files\Docker Toolbox

Answer 1

似乎您在mvn.bat中设置了java_home。它可能指向Java的旧版本（在您的例子中为8）。

set java_home=c:\path\to\jdk11在调用Maven之前，尝试在第一行使用它。