运行docker镜像，出现Exited (137) 5 seconds ago问题

Posted 2021-09-07 覃会程

通过docker ps -a命令查看容器状态，发现状态为：

Exited (137) 5 seconds ago

然后使用docker logs -f container_id命令查看日志信息，发现是代码有错：

Exception in thread "main" java.lang.UnsupportedClassVersionError: com/blockchain/management/BlockchainManagementApplication 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:756)
        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:418)
        at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:92)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
        at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:45)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:86)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:50)

然后idea中调试代码，能正常启动，并查看dockerfile如下：

# Docker image for springboot file run
# VERSION 0.0.1
# Author: eangulee
# 基础镜像使用java
FROM repository.gridsum.com:8443/library/maven:3.6.2-jdk-8 as builder
# 作者
MAINTAINER autogeneration
# VOLUME 指定了临时文件目录为/tmp。
# 其效果是在主机 /var/lib/docker 目录下创建了一个临时文件，并链接到容器的/tmp
VOLUME /tmp 
# 将jar包添加到容器中并更名为app.jar
ADD management-0.0.1-SNAPSHOT.jar app.jar 
# 运行jar包
RUN bash -c 'touch /app.jar'
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]

重新制作镜像，再次运行，还是出现相同的错误

Exception in thread "main" java.lang.UnsupportedClassVersionError: com/blockchain/management/BlockchainManagementApplication 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:756)
        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:418)
        at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:92)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
        at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:45)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:86)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:50)

产生问题的原因：

经过查询，发现是pom.xml的使用的jdk版本和dockerfile中的builder不一致

pom.xml使用的是11，buidler使用的是8

解决问题：

将buidler中的版本修改为11，然后再一次制作镜像，启动容器，最终成功启动，状态为Up

在浏览器访问成功：