在 docker 中更改 JAVA_HOME [英] Change JAVA_HOME in docker

问题描述

我想要 dockerise 的旧版 Web 应用程序使用了一些旧类，例如 com/sun/image/codec/jpeg/ImageFormatException，这些类在 Java SE7 之前一直受支持.现在在 docker 容器中默认 jdk 获取(在安装 tomcat-6 容器时)是

The legacy web application which I want to dockerise uses some old classes like com/sun/image/codec/jpeg/ImageFormatException which were supported till Java SE7. Now in the docker container default jdk getting (on installing tomcat-6 container) is

java version "1.7.0_131"
OpenJDK Runtime Environment (IcedTea 2.6.9) (7u131-2.6.9-2~deb8u1)

OpenJdk 不支持这些类

OpenJdk doesn't support these classes

我使用update-alternatives来安装Oracle Jdk7.80

I used update-alternatives to install Oracle Jdk7.80

加载容器后，给 java -version 我得到

After loading container, on giving java -version I am getting

java version "1.7.0_80"
Java(TM) SE Runtime Environment (build 1.7.0_80-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode)

然而，echo $JAVA_HOME 进入容器后给出了 /docker-java-home/jre 再次指向 OpenJdk.如何将 JAVA_HOME 设置为我安装的 Oracle Jdk 主目录?

However, echo $JAVA_HOME after entering the container gives /docker-java-home/jre which again points to OpenJdk. How can I set JAVA_HOME to the Oracle Jdk home that I installed?

推荐答案

您可以使用 Dockerfile 中的 ENV 命令简单地设置/更改 docker 镜像的环境变量:

You can simply set/change environment variables of your docker image by using the ENV command in your Dockerfile:

ENV JAVA_HOME /path/to/java

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