41 lines
1.5 KiB
Markdown
41 lines
1.5 KiB
Markdown
# What is OpenJDK?
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OpenJDK (Open Java Development Kit) is a free and open source implementation of the Java Platform, Standard Edition (Java SE). OpenJDK is the official reference implementation of Java SE since version 7.
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> [wikipedia.org/wiki/OpenJDK](http://en.wikipedia.org/wiki/OpenJDK)
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Java is a registered trademark of Oracle and/or its affiliates.
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%%LOGO%%
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# How to use this image
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## Start a Java instance in your app
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The most straightforward way to use this image is to use a Java container as both the build and runtime environment. In your `Dockerfile`, writing something along the lines of the following will compile and run your project:
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```dockerfile
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FROM %%REPO%%:7
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COPY . /usr/src/myapp
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WORKDIR /usr/src/myapp
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RUN javac Main.java
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CMD ["java", "Main"]
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```
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You can then run and build the Docker image:
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```console
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$ docker build -t my-java-app .
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$ docker run -it --rm --name my-running-app my-java-app
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```
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## Compile your app inside the Docker container
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There may be occasions where it is not appropriate to run your app inside a container. To compile, but not run your app inside the Docker instance, you can write something like:
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```console
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$ docker run --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp %%REPO%%:7 javac Main.java
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```
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This will add your current directory as a volume to the container, set the working directory to the volume, and run the command `javac Main.java` which will tell Java to compile the code in `Main.java` and output the Java class file to `Main.class`.
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