Hermes has been tested with WebLogic 8.X through 10.X although should work with earlier versions and there is a plugin available. Note how a number of properties must be set on the plugin.
James Bayer has blogged on getting Hermes working with WLS 10.X
Access is only supported via JNDI, do not try and "scan" the weblogic.jar library is its very big, will take ages and you'll probably run out of memory.
There is a tutorial available contributed by James Bayer who also sent me this tip when using WebLogic Server 9.2 and Hermes. If you've set the providers classpath group correctly and yet see this error:
2007-01-25 16:42:28,578 [Hermes ThreadPool-1] ERROR hermes.browser.tasks.HermesBrowserTaskListener - javax/ejb/EJBObject
Adding the weblogic.jar to the classpath in the hermes.sh or hermes.bat startup script fixes the problem, the only side effect being that you can't run other versions of WebLogic client in the same Hermes VM.