How to install JDK in Docker container

Docker is an open source containerization platform that makes it easier for developers to build, publish and run applications. JDK is an important foundation for today's Java program development, and installing JDK is a necessary step for Java program development. This article will introduce how to install JDK in a Docker container.

Step 1: Download JDK from the official source

To install the JDK in the Docker container, we need to download the JDK binary file. You can download the JDK from the official source or from the mirror source. This article takes the official source as an example:

RUN apt-get update && apt-get install -y curl
RUN curl -L -O -H "Cookie: oraclelicense=accept-securebackup-cookie" \
  "https://download.oracle.com/otn-pub/java/jdk/11.0.12+7/f411702ca7704a54b1c574303c5aed33/jdk-11.0.12_linux-x64_bin.deb"
RUN apt-get install -y ./jdk-11.0.12_linux-x64_bin.deb

The above code will download the JDK binary file and perform the installation.

Step 2: Set environment variables

After installing the JDK, you also need to set the JAVA_HOME and PATH environment variables so that the program can correctly access the JDK. Add the following code snippet to the Dockerfile:

ENV JAVA_HOME=/usr/lib/jvm/java-11-oracle
ENV PATH="$PATH:${JAVA_HOME}/bin"

Among them, JAVA_HOME points to the JDK installation path, and the PATH environment variable contains the path to JAVA_HOME/bin.

Step 3: Build the Docker image

Execute the following code in the directory where the Dockerfile is located to build the Docker image:

docker build -t jdk11 .

Among them, jdk11 is the image name.

Step 4: Create the container and test the JDK

Use the following command to create the container:

docker run --rm -it jdk11

Among them, the --rm option means to delete the container when the container exits, and the -it option Indicates interactive operation.

After the container is started, enter the following command in the terminal to test whether the JDK is installed correctly:

java -version

If the JDK version information is output, it means that the JDK has been installed correctly.

Summary

The above are all the steps to install JDK in a Docker container. Building containers through Docker can avoid polluting the host environment and improve development efficiency and application portability. In actual projects, we can adjust the JDK version and configuration according to specific needs to meet project needs.

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