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{section} h1. Introduction
The Petals ESB "Autoloader" is an a *post*-extension providing (un)installation/(un)deployment service copying or removing files from the filesystem.
To install/deploy a JBI artifact, just copy the JBI archive into the installation/deployment directory, and remove the file associated to a JBI archive from the uninstallation/undeployment directory to uninstall/undeploy it.
Supoorted JBI artifact to be deployed are:
* shared libraries,
* components: binding components and service engines,
* service assemblies,
* deployable service units.
* shared libraries,
* components: binding components and service engines,
* service assemblies,
* deployable service units.
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...+Note 1:+ If a JBI artifact is installed/deployed by another process, using the JMX API for example, the autoloader is notified and the associated JBI archive is put in the uninstallation/undeployment directory, so it will be possible to use the Petals ESB autoloader to uninstall/undeploy the JBI artifact.
+Note 2:+ A service assembly is automatically generated during the deployment process of a deployable service unit. So to undeploy such a service unit, you *MUST* undeploy the generated service assembly identified by:
* its JBI identifier defined as the service unit identifier,
* its filename defined as {{sa-<su-jbi-identifier>-<uid>.zip}}, where {{su-jbi-identifier}} is the service unit identifier and {{<uid>}} is an UID.
* its JBI identifier defined as the service unit identifier,
* its filename defined as {{sa-<su-jbi-identifier>-<uid>.zip}}, where {{su-jbi-identifier}} is the service unit identifier and {{<uid>}} is an UID.
+Note 23:+ If Petals ESB was installed on a Debian-based operating system from Debian packages, the filesystem operations must be done with the right system user: {{petals}}
{code}
sudo -u petals cp /tmp/petals-bc-soap-4.3.0.zip /var/lib/petals-esb/sample0/install
sudo -u petals cp /tmp/petals-bc-soap-4.3.0.zip /var/lib/petals-esb/sample0/install
...If a JBI artifact is uninstalled/undeployed through the Petals ESB autoloader and has another JBI artifacts depending on it, they will be automatically uninstalled/undeployed.
+Note 34:+ If a JBI artifact is uninstalled/undeployed by another process, using the JMX API for example, the autoloader is notified and the associated JBI archive is automatically removed from the uninstallation/undeployment directory, without trigering another uninstallation/undeployment ;).
+Note 45:+ If Petals ESB was installed on a Debian-based operating system from Debian packages, the filesystem operations must be done with the right system user: {{petals}}
{code}
sudo -u petals rm /var/lib/petals-esb/sample0/installed/petals-bc-soap-4.3.0.zip
sudo -u petals rm /var/lib/petals-esb/sample0/installed/petals-bc-soap-4.3.0.zip
...