I'm investigating the possibility of hosting a Guacamole server using the
Play Framework ( https://www.playframework.com/
<https://www.playframework.com/> ) which is not compatible with HTTP
Servlets. This requires re-implementing the GuacamoleHTTPTunnelServlet as an
endpoint compatible with the Play API. The servlet implementation is not
overly large and is a good candidate for re-implementing for a different web
server API however the servlet makes use of GuacamoleHTTPTunnelMap as a
means of managing known tunnels across different requests. That class is
package-private which means it cannot be used outside of the
guacamole-common module/source.
Workaround attempts:
I've tried creating an org.apache.guacamole.servlet package in my
project and making a new public class which extends GuacamoleHTTPTunnelMap
however this is not compatible with Java 9 module system.
I've tried copy/pasting the entire contents into its own class. This
ends up with the same module issues because internally this class uses
GuacamoleHTTPTunnel which is also package-private.
Using either of these attempts results in IllegalAccessError during runtime
which I'm unsure if there's a way to work around. I've tried using
add-opens/add-exports when running the server however this does not seem to
be able to identify the right module for guacamole-common-1.1.0.jar. Using
the jar tool I've inspected the guacamole-common-1.1.0.jar and it identifies
using an automated module of [email protected] however this line
--add-opens guacamole.common/org.apache.guacamole.servlet=ALL-UNNAMED
and this line
--add-opens [email protected]/org.apache.guacamole.servlet=ALL-UNNAMED
Both result in this warning
WARNING: Unknown module: guacamole.common specified to --add-opens
I think making GuacamoleHTTPTunnelMap public is a small and low-risk change
that should resolve the module issues and allow alternate server API
implementations. Would a pull request with this change be accepted for the
gaucamole-client project?
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