Configuring Keycloak Tomcat Adapter in Maven Tomcat adapter. You must edit your plugin configuration in pom.xml, add a context.xml file with the code above and enjoy wit mvn tomcat:run

pom.xml

<!-- pom.xml --->
<plugins>
  <plugin>
      <groupId>org.apache.tomcat.maven</groupId>
      <artifactId>tomcat7-maven-plugin</artifactId>
      <version>2.2</version>
      <configuration>
          <path>/memento</path>
          <port>9999</port>
          <contextFile>src/main/webapp/META-INF/context.xml</contextFile>
          <contextReloadable>true</contextReloadable>
      </configuration>
      <dependencies>
          <dependency>
              <groupId>org.keycloak</groupId>
              <artifactId>keycloak-tomcat7-adapter</artifactId>
              <version>2.2.1.Final</version>
          </dependency>
      </dependencies>
  </plugin>
</plugins>

<!-- context.xml --->
<Context path="/memento">
    <Valve className="org.keycloak.adapters.tomcat.KeycloakAuthenticatorValve"/>
</Context>