I am using IBM WSAD/RAD 6.0 but I had some problems with the integrated WAS 6 server within.
After an sometime the WAS server hangs at Starting... state.
Sometimes the server starts neither in debug mode nor start mode. It just says Starting...
In one case the server starts in debug mode but when you try to start in normal mode it hangs.
The solution: Just remove all the files in the preload folder typically located in the %installation_root%/runtimes/base_v6/profiles/default/logs/preload folder.