# The Client Classpath

Apache ActiveMQ Artemis requires just a single jar on the client classpath.

> Warning

> The client jar mentioned here can be found in the `lib/client` directory of the Apache ActiveMQ Artemis distribution. Be sure you only use the jar from the correct version of the release, you must not mix and match versions of jars from different Apache ActiveMQ Artemis versions. Mixing and matching different jar versions may cause subtle errors and failures to occur.

Whether you are using JMS or just the Core API simply add the `artemis-jms-client-all.jar` from the `lib/client` directory to your client classpath. This is a "shaded" jar that contains all the Artemis code plus dependencies (e.g. JMS spec, Netty, etc.).

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