执行jar时出现UnsupportedClassVersionError

Question

我尝试使用默认 spring 引导插件将我的项目打包到 jar 中。那是我的构建标签的样子 - 很简单。

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

正如预期的那样，我在目标文件夹中收到了我的 .jar（执行 mvn 安装）。但是，当我尝试使用

执行 jar 时

java -jar <filename>.jar

出现问题，这里是堆栈跟踪

> C:\Users\Misha\IdeaProjects\discoveery-service\target>java -jar discoveery-service-0.0.1-SNAPSHOT.jar
Exception in thread "main" java.lang.UnsupportedClassVersionError: com/example/discoveeryservice/DiscoveryServiceApplication has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access0(Unknown Source)
        at java.net.URLClassLoader.run(Unknown Source)
        at java.net.URLClassLoader.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:151)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Unknown Source)
        at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:46)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:107)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:58)
        at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:88)

W

那是什么？我还没有遇到这个问题。

Answer 1

解决 - 我唯一改变的是 java maven 的版本将从 11 打包到 8

<properties>
    <java.version>8</java.version>
</properties>

执行jar时出现UnsupportedClassVersionError

UnsupportedClassVersionError occurs during execution jar

compiler-errors

jar