Christopher Speck created GUACAMOLE-1246:
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Summary: Unable to implement GuacamoleHTTPTunnelServlet using
different web server API
Key: GUACAMOLE-1246
URL: https://issues.apache.org/jira/browse/GUACAMOLE-1246
Project: Guacamole
Issue Type: Improvement
Components: guacamole-common
Affects Versions: 1.2.0
Environment: Java 11, Play Framework 2.7
Reporter: Christopher Speck
I'm investigating the possibility of hosting a Guacamole server using the Play
Framework ([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.
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