New Relic does not distribute the jar(s) required to build this instrumentation module nor are they available from a public repository such as Maven Central or jcenter.
To build this instrumentation module you must provide the jar(s) and place them into the /lib subdirectory as follows:
instrumentation/websphere-jmx-7/lib/com.ibm.ws.admin.core.jarcom.ibm.ws.admin.core - 7.0.0 or above