OST failure NoClassDefFoundError

I get this on basic suite from a built RPM[1]: Caused by: java.lang.NoClassDefFoundError: org/apache/commons/lang/StringUtils at org.ovirt.vdsm.jsonrpc.client.reactors.stomp.impl.Message.withCorrelationId(Message.java:75) [vdsm-jsonrpc-java-client.jar:] at org.ovirt.vdsm.jsonrpc.client.reactors.stomp.SSLStompClient.sendMessage(SSLStompClient.java:85) [vdsm-jsonrpc-java-client.jar:] at org.ovirt.vdsm.jsonrpc.client.JsonRpcClient.call(JsonRpcClient.java:83) [vdsm-jsonrpc-java-client.jar:] My patch under test certainly didn't touch this area [2] [1] http://jenkins.ovirt.org/job/ovirt-system-tests_manual/290/artifact/expor... [2] https://gerrit.ovirt.org/#/c/75262/ Did anyone see that?