See https://jira.jboss.org/browse/EMBJOPR-329.
This has been fixed in master via commit 727c897. There are three new AS Server plugin config props that are used to resolve client jars if they are set: clientLibUrl, libUrl, and commonLibUrl.
Verified on RHQ-Master build #500 JBossAS-5.x: 'Inventory'->'Connection Settings'->'Connection Info' has input parameters (config props) for clientLibUrl, libUrl, and commonLibUrl.
Created attachment 455534 [details] screenshot
Bookkeeping - closing bug - fixed in recent release.
Since this fix went into RHQ 3.0.0, it is already in the http://git.fedorahosted.org/git?p=rhq/rhq.git;a=shortlog;h=refs/heads/AdminConsole_EAP_5_1 branch and is included in the EAP 5.x admin-console.