add dependency to cdi-portlet-integration, and add to portlet.xml following entries

<filter>
<filter-name>PortletCDIFilter</filter-name>
<filter-class>org.gatein.cdi.PortletCDIFilter</filter-class>
<lifecycle>ACTION_PHASE</lifecycle>
<lifecycle>EVENT_PHASE</lifecycle>
<lifecycle>RENDER_PHASE</lifecycle>
<lifecycle>RESOURCE_PHASE</lifecycle>
</filter>
<filter-mapping>
<filter-name>PortletCDIFilter</filter-name>
<portlet-name>[Name of your portlet as defined in portlet-name]</portlet-name>
</filter-mapping>

for more details check:
https://github.com/portletbridge/cdi-portlet-integration/blob/master/README.md
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