spring boot、docker和EC2中的Java版本

Question

• Spring启动版本-2.1.13。BUILD-SNAPSHOT
• Java编译器版本-Jdk11
• AWS EC2Java版本-jdk7

我开始从事一个微服务项目。因此，我的服务的docker映像是在Jdk11中编译的。当我尝试下载并运行容器时，它不会运行。现在在检查日志后，我看到了-java。lang.UnsupportedClassVersionError我正在使用maven构建。我应该在pom中更改java版本吗。xml？我无法在ec2中更新java版本。请告诉我如何解决这次碰撞并继续。我有很多服务，我正试图把它全部放在EC2中。

Docker文件：更新到Java11

FROM openjdk:11.0-jdk-slim
VOLUME /tmp
COPY snapAppKey.jks snapAppKey.jks
COPY /target/SnapAppConfigServer-0.0.1-SNAPSHOT.jar ConfigServer.jar
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","ConfigServer.jar"]

酶代码EC2

   Exception in thread "main" java.lang.UnsupportedClassVersionError: com/snapapp/config/api/SnapAppConfigServerApplication 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(ClassLoader.java:763)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:93)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:46)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:87)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:51)
        at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:52)

Answer 1

将现有代码从JDK11迁移到JDK8将比上述简单操作更费劲。

将Docker文件中的openjdk:8-jdk-alpine更改为openjdk:11