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The following picture describes the architecture of the deployer.

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Spring deployer

Karaf includes a deployer that is able to deploy plain spring / blueprint or spring-dm configuration files.
The deployer will transform on the fly any spring configuration file dropped into the deploy folder into a valid OSGi bundle.

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<spring:beans ...>
  <manifest>
    Require-Bundle= my-bundle
  </manifest>

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Features deployer

To be able to hot deploy features from the deploy folder, you can just drop a feature descriptor on that folder. A bundle will be created and its installation (automatic) will trigger the installation of all features contained in the descriptor. Removing the file from the deploy folder will uninstall the features.
If you want to install a single feature, you can do so by writing a feature descriptor like the following:

<features>
  <repository>mvn:org.apache.servicemix.nmr/apache-servicemix-nmr/1.0.0/xml/features</repository>
  <feature name="nmr-only">
    <feature>nmr</feature>
  </feature>
<features></features>

For more informations about features, see the provisioning section.

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