Version: 9.4.2.v20170220 |

Hot Deployment
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## Hot Deployment

Jetty allows for deploying an arbitrary context or web application by monitoring a directory for changes. If a web application or a context descriptor is added to the directory, Jetty’s DeploymentManager (DM) deploys a new context. If a context descriptor is touched or updated, the DM stops, reconfigures, and redeploys its context. If a context is removed, the DM stops it and removes it from the server.

This behavior can be controlled by configuring `WebAppProvider` properties.

monitoredDirName
  The directory to scan for possible deployable Web Applications (or Deployment Descriptor XML files).
scanInterval
  Number of seconds between scans of the provided `monitoredDirName`. A value of `0` disables the continuous hot deployment scan, Web Applications will be deployed on startup only.

The default location for this configuration is in the `${jetty.home}/etc/jetty-deploy.xml` file.

    <?xml version="1.0"?>
    <!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "http://www.eclipse.org/jetty/configure_9_3.dtd">

    <Configure id="Server" class="org.eclipse.jetty.server.Server">

      <Call name="addBean">
        <Arg>
          <New id="DeploymentManager" class="org.eclipse.jetty.deploy.DeploymentManager">
            <Set name="contexts">
              <Ref refid="Contexts" />
            </Set>
            <Call name="setContextAttribute">
              <Arg>org.eclipse.jetty.server.webapp.ContainerIncludeJarPattern</Arg>
              <Arg>.*/[^/]*servlet-api-[^/]*\.jar$|.*/javax.servlet.jsp.jstl-.*\.jar$|.*/org.apache.taglibs.taglibs-standard-impl-.*\.jar$</Arg>
            </Call>

            <Call id="webappprovider" name="addAppProvider">
              <Arg>
                <New class="org.eclipse.jetty.deploy.providers.WebAppProvider">
                  <Set name="monitoredDirName"><Property name="jetty.base" default="." />/<Property name="jetty.deploy.monitoredDir" deprecated="jetty.deploy.monitoredDirName" default="webapps"/></Set>
                  <Set name="defaultsDescriptor"><Property name="jetty.home" default="." />/etc/webdefault.xml</Set>
                  <Set name="scanInterval"><Property name="jetty.deploy.scanInterval" default="1"/></Set>
                  <Set name="extractWars"><Property name="jetty.deploy.extractWars" default="true"/></Set>
                </New>
              </Arg>
            </Call>
          </New>
        </Arg>
      </Call>
    </Configure>

See Understanding the Default WebAppProvider for more configuration details.

See also Deployment Architecture for detailed conceptual information.

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