JDK 9 on drools DMN: tests in kie-dmn-core fails on ConcurrentModificationException in KnowledgeBuilderImpl ----------------------------------------------------------------------------------------------------------- Key: DROOLS-2111 URL: https://issues.jboss.org/browse/DROOLS-2111 Project: Drools Issue Type: Bug Components: dmn engine Affects Versions: 7.4.1.Final Reporter: Tibor Zimányi Assignee: Tibor Zimányi Fix For: 7.5.0.Final When tests from module kie-dmn-core are run on JDK 9, they fails on ConcurrentModificationException with the following stacktrace [1]. [1] https://gist.github.com/baldimir/92b270fa5527133de8a605c456b136ff