Application Manager not starting on Redhat

We're currently evaluating Application Manager, and it is failing to startup on Redhat. We get the following:

Starting Applications Manager "Primary" Server Modules, please wait ...
Process : StandaloneApplnProcess [ FAILED ]

Process : AppManagerRunApacheExeModule [ Started ]
Process : AMScriptProcess [ Started ]
Process : AuthMgr [ Started ]
Process : AMDataCleanupProcess [ Started ]
Process : DBUserStorageServer [ Started ]
Process : NmsPolicyMgr [ Started ]
Process : NMSMServer [ Started ]
Process : NmsAuthManager [ Started ]
Process : WSMProcess [ Started ]
Process : NmsAuthenticationManager [ Started ]
Process : RunRmiRegistry [ Started ]
Process : NmsConfigurationServer [ Started ]
Process : AMDistributionProcess [ Started ]
Process : AMCAMProcess [ Started ]
Process : NMSSAServer [ Started ]
Process : AMServerStartUp [ Started ]
Process : AMFaultProcess [ Started ]
Process : AMEventProcess [ Started ]
Process : AMUrlMonitorProcess [ Started ]
Process : MapServerBE [ Started ]
Process : Collector [ Started ]
Process : DBServer [ Started ]
Process : RunJSPModule [ Started ]

At this point, the startup process just stalls....

Any help would be great, as we can't evaluate it if we can't get it running.