jetty-env.xml

<?xml version="1.0"  encoding="UTF-8"?>
<!DOCTYPE Configure PUBLIC
          "-//Mort Bay Consulting//DTD Configure//EN"
          "http://www.eclipse.org/jetty/configure_9_3.dtd">

<!-- We disable websocket because we don't use it, see https://www.eclipse.org/jetty/documentation/current/_enabling_websocket.html -->
<Configure class="org.eclipse.jetty.webapp.WebAppContext">
    <Call name="setAttribute">
        <Arg>org.eclipse.jetty.websocket.jsr356</Arg>
        <Arg>false</Arg>
    </Call>
    <Call name="setAttribute">
        <Arg>org.eclipse.jetty.containerInitializerExclusionPattern</Arg>
        <Arg>org.eclipse.jetty.websocket.jsr356.server.deploy.WebSocketServerContainerInitializer|org.researchspace.*</Arg>
    </Call>
</Configure>