Look in <$WebmethodsHome>\Servers\RepoV3 for the default jar file, something like sl**.jar. You can reference it on the configuration screen as something like ./sl53_cj34.jar, or even the full path.
You can also find a similar jar file in <$WebmethodsHome>\IntegrationServer\lib\jars and use it instead.
Look in AdminConsole>JDBC Pools>Driver Alias Definitions>Class Name for a list of out-of the box driver classes that come with a normal installation.
In some cases, the port may already be in use, try a different one.
Also, after you reload the package, look for any error messages in Server and/or Error log as they might give more info.
#BPM#webMethods#webMethods-BPMS