The following configuration is mandatory for JCR to work correctly (this is done in the add-on already):

<external-component-plugins>

    <target-component>org.exoplatform.services.jcr.RepositoryService</target-component>

    <component-plugin>

        <name>add.namespaces</name>

        <set-method>addPlugin</set-method>

        <type>org.exoplatform.services.jcr.impl.AddNamespacesPlugin</type>

        <init-params>

            <properties-param>

                <name>namespaces</name>

                <property name="cmis" value="http://www.exoplatform.com/jcr/cmis/1.0"/>

                <property name="xcmis" value="http://www.exoplatform.com/jcr/xcmis/1.0"/>

            </properties-param>

        </init-params>

    </component-plugin>

    <component-plugin>

        <name>add.nodeType</name>

        <set-method>addPlugin</set-method>

        <type>org.exoplatform.services.jcr.impl.AddNodeTypePlugin</type>

        <init-params>

            <values-param>

                <name>autoCreatedInNewRepository</name>

                <description>Node types configuration file</description>

                <value>jar:/conf/cmis-nodetypes-config.xml</value>

            </values-param>

        </init-params>

    </component-plugin>

</external-component-plugins>