69 lines
2.8 KiB
Markdown
69 lines
2.8 KiB
Markdown
# Supported tags and respective `Dockerfile` links
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- [`6b32`, `6` (*6/Dockerfile*)](https://github.com/docker-library/docker-java/blob/6cc25ee35281099423e521713f710d2549209600/6/Dockerfile)
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- [`7u65`, `7`, `latest` (*7/Dockerfile*)](https://github.com/docker-library/docker-java/blob/6cc25ee35281099423e521713f710d2549209600/7/Dockerfile)
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- [`8u40`, `8` (*8/Dockerfile*)](https://github.com/docker-library/docker-java/blob/00a9c5c080f2a5fd1510bc0716db7afe06cbd017/8/Dockerfile)
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# What is Java?
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Java is a concurrent, class-based, object-oriented language specifically
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designed to have as few implementation dependencies as possible. It is intended
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to allow application developers to "write once, run anywhere", meaning that code
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that runs on one platform does not need to be recompiled to run on another.
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Java is a registered trademark of Oracle and/or its affiliates.
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> [wikipedia.org/wiki/Java_(programming_language)](http://en.wikipedia.org/wiki/Java_(programming_language))
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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
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both the build and runtime environment. In your `Dockerfile`, writing something
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along the lines of the following will compile and run your project:
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FROM java: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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You can then run and build the Docker image:
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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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## 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
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container. To compile, but not run your app inside the Docker instance, you can
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write something like:
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docker run --rm -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp java:7 javac Main.java
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This will add your current directory as a volume to the container, set the
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working directory to the volume, and run the command `javac Main.java` which
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will tell Java to compile the code in `Main.java` and output the Java class file
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to `Main.class`.
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# User Feedback
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## Issues
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If you have any problems with, or questions about this image, please contact us
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through a [GitHub issue](https://github.com/docker-library/java/issues) or via the IRC
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channel `#docker-library` on [Freenode](https://freenode.net).
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## Contributing
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You are invited to contribute new features, fixes, or updates, large or small;
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we are always thrilled to receive pull requests, and do our best to process them
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as fast as we can.
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Before you start to code, we recommend discussing your plans
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through a [GitHub issue](https://github.com/docker-library/java/issues), especially for more ambitious
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contributions. This gives other contributors a chance to point you in the right
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direction, give you feedback on your design, and help you find out if someone
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else is working on the same thing.
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