You are looking at the docs for the unreleased master branch of Dgraph. The latest version is v20.07.
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Java

The official Java client can be found here. Follow the instructions in the README to get it up and running.

More details on the supported versions can be found at this link.

We also have a DgraphJavaSample project, which contains an end-to-end working example of how to use the Java client.