Connecting to multiple OMERO servers doesn't seem to work

[hinerm]

When running in Fiji with the "Import from OMERO" commands, given two OMERO database locations (server A and server B), attempting to open an image from server A and then an image from server B within the same JVM results in security errors such as "User doesn't have access" or "Group doesn't exist".

Interestingly, when the following steps happens:

1. Open server A image
2. Try to open server B image (fails but leaves a cached OMEROSession for server B)
3. Manually closing the session created in (2)
4. Opening an image from server B again

It works! But then trying to open a server A image using its originally cached OMEROSession fails with the aforementioned security exceptions.

This strongly suggests one of:

• there is additional cached state on the OMERO side making caching sessions inadvisable
• we're using the OMERO API incorrectly

Currently, the user workaround is to restart the application when needing to switch servers.

[joshmoore]

In case it helps, the omero.client object wraps a single Ice.Connection matching exactly one session.