Duplicated classes in META-INF folder ------------------------------------- Key: WFLY-13512 URL: https://issues.redhat.com/browse/WFLY-13512 Project: WildFly Issue Type: Quality Risk Reporter: Antonio Fernandez Alhambra Priority: Major Labels: reported-by-qe Attachments: Screenshot from 2020-05-14 17-20-16.png There are duplicated classes inside the org.wildfly.common:wildfly-common file. So whenever the enforcer maven plugin is used for building, if there is a dependency in the pom.xml, enforcer plugin will fail complaining about this jar due to these duplicated jar files. {noformat} Duplicate classes found: Found in: org.kie.server:kie-server-router-proxy:jar:7.38.0-SNAPSHOT:compile org.wildfly.common:wildfly-common:jar:1.5.1.Final:compile Duplicate classes: META-INF/versions/9/org/wildfly/common/lock/JDKSpecific.class META-INF/versions/9/org/wildfly/common/os/ProcessRedirect.class META-INF/versions/9/org/wildfly/common/lock/Substitutions$Target_PauseNode.class META-INF/versions/9/org/wildfly/common/os/GetProcessInfoAction.class META-INF/versions/9/org/wildfly/common/lock/JDKSpecific$1.class META-INF/versions/9/org/wildfly/common/lock/Substitutions.class META-INF/versions/9/org/wildfly/common/lock/Substitutions$Target_JDKSpecific.class META-INF/versions/11/org/wildfly/common/archive/JDKSpecific.class META-INF/versions/9/org/wildfly/common/cpu/ProcessorInfo.class {noformat} Seems these duplicated classes are bundled in the jar since version 1.4.x onwards. These duplicated classes are located in the META-INF/versions folders inside the jar. Attached a screenshot of the same.