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From "Felix Meschberger (JIRA)" <j...@apache.org>
Subject [jira] Aktualisiert: (JCR-291) jcr-server-webapp: RMI Registration unstable
Date Sun, 11 Dec 2005 12:56:09 GMT
     [ http://issues.apache.org/jira/browse/JCR-291?page=all ]

Felix Meschberger updated JCR-291:
----------------------------------

    Attachment: RMIRegistry_fm_051211.diff

Attaching a patch to RepositoryStartupServlet relative to the contrib/jcr-server/webapp directory.

This patch fixes the issue as follows (also see the added class comment regarding RMI registration):

  - If neither rmi-uri, nor rmi-port, nor rmi-host is configured, RMI registration does not
take place (as today)
  - If rmi-uri is configured, rmi-host and rmi-port are ignored. Repository-name is ignored
if rmi-uri contains a name

If the host name - either from rmi-uri or rmi-host parameter - is empty or null, the local
host is used.
If the port number is negative, zero or higher than 65535, the default port number 1099 is
used.

After gathering the information, a Registry instance has to be retrieved. First LocalRegistry.createRegistry
is called. If the host name is not empty or null a custom RMIServerSocketFactory is created
which is enabled to create server sockets to a specific interface, otherwise the standard
RMIServerSocketFactory is used, which simply creates a server socket binding to all interfaces
on the local host.

If creating the registry fails - e.g. because host is a remote host or a registry is already
active - LocalRegistry.getRegistry is called with the host and port.

Finally the registry retrieved above is used to bind the repository.

If there is no opposition or further enhancement, I will commit the fix sometime next week.

> jcr-server-webapp: RMI Registration unstable
> --------------------------------------------
>
>          Key: JCR-291
>          URL: http://issues.apache.org/jira/browse/JCR-291
>      Project: Jackrabbit
>         Type: Improvement
>  Environment: SVN Rev. 355696
>     Reporter: Felix Meschberger
>     Priority: Minor
>  Attachments: RMIRegistry_fm_051211.diff
>
> Registration of the repository to a RMI registry in RepositoryStartupServlet.registerRMI
uses web application parameters inconsistently and may not always succeed registering the
repository.
> Today, the registerRMI uses these parameters for registration to RMI:
>     rmi-host : The name of the host on which the registry is running
>     rmi-port : The port on which the registry is running
>     rmi-uri : An RMI URI to use for registration
>     repository-name : The name to bind the repository to
> The problem is, that rmi-port is used to try to create the registry to make sure a registry
is running on the local host. The rmi-uri is used to register the repository using the static
Naming.bind method. If the rmi-uri is not configured, the URI is created from rmi-host, rmi-port
and repository-name.
> This may now create a bunch of problems: If the rmi-port and rmi-uri configurations do
not match, registration fails, if rmi-host does not resolve to an IP address to which the
registry is bound, registration fails.
> I encounter this issue, when trying to register the repository to an RMI registry using
default rmi-port configuration (rmi-host and rmi-uri not configured) when running the web
app in Jetty.

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