Almost, but not quite empty SE-container throws exception on missing beans.xml

Run this JUnit5 test: package com.example; import org.jboss.weld.junit5.WeldInitiator; import org.jboss.weld.junit5.WeldSetup; import org.jboss.weld.junit5.auto.EnableAutoWeld; import org.junit.jupiter.api.Assertions; import org.junit.jupiter.api.Test; import javax.enterprise.context.Dependent; import javax.enterprise.event.Observes; import javax.enterprise.inject.spi.AfterBeanDiscovery; import javax.enterprise.inject.spi.Extension; @EnableAutoWeld public class BugHunt5000 { @WeldSetup WeldInitiator weld = WeldInitiator.from(MyExtension.class).build(); @Test public void dummy () { Assertions.assertEquals(42, weld.select( Integer .class).get()); } } class MyExtension implements Extension{ private void addBean(@Observes AfterBeanDiscovery abd){ abd.addBean() .types( Integer .class) .scope(Dependent.class) .produceWith(__ -> 42); } } A workaround exists: Just add a dummy bean class to the WeldInitiator.