[ https://issues.redhat.com/browse/WFLY-10554?page=com.atlassian.jira.plugi... ] Radoslav Ivanov commented on WFLY-10554: ---------------------------------------- I understand it is a private module and it is not recommended to use it. However, there is a compile dependency (see my previous comments and snapshot image; also it listed in maven central repo that metrics is a compile dependency of opensaml-core) and sometimes could be a matter of JVM classloading algorithm to hit class not found exception/class not def found error. It could be easily reproduced, also mentioned in previous comments, as follow (calling org.opensaml.core.config.InitializationService.initialize()): {code:java} Caused by: java.lang.NoClassDefFoundError: com/codahale/metrics/MetricRegistry at org.opensaml//org.opensaml.core.metrics.impl.MetricRegistryInitializer.init(MetricRegistryInitializer.java:42) at org.opensaml//org.opensaml.core.config.InitializationService.initialize(InitializationService.java:56) {code} -- This message was sent by Atlassian Jira (v7.13.8#713008)