Hi Matej, cdi-api-2.0.Beta1.jar was pulled into the servlet war by its library dependency jar which was built with dependency cdi-api2.0.Beta1. weld-servlet-3.0.0.Alpha1.jar was pulled in by the following for the servlet app. Is there a weld-servlet version for Weld 3.0.0.Beta1 ?

<dependency>
<groupId>org.jboss.weld.servlet</groupId>
<artifactId>weld-servlet</artifactId>
<version>3.0.0.Alpha1</version>
</dependency>

>Tomcat 9 requires you to add some JVM arg magic when running on Java 9, have you done that?
yes, in catalina.sh - the following setting allows catalina startup.sh succeed for JDK9 b153
JAVA_OPTS="--add-opens=java.base/java.lang=ALL-UNNAMED $JAVA_OPTS $JSSE_OPTS"

will try your suggestedd CATALINA_OPTS as well. Thanks.