On 8/3/2016 2:49 PM, Ken Wills wrote:

On Wed, Aug 3, 2016 at 8:53 AM, Stan Silvert <ssilvert@redhat.com> wrote:

The Keycloak server is currently configured via a keycloak-server.json
file.  We are converting this to configuration through
standalone.xml/domain.xml.

To automatically upgrade, I need to read keycloak-server.json and write
back to standalone.xml.  I can easily add the operations to do this at
parse time.  The parser has this method:

@Override
public void readElement(final XMLExtendedStreamReader reader, final
List<ModelNode> list) throws XMLStreamException

So one way to do this is to parse keycloak-server.json at this time and
add operations to the list.

That puts everything into the management model.  But nothing will be
written to standalone.xml unless someone manually does a write operation
from CLI.

Not sure if this is exactly what you're looking for, but subsystems / extensions usually register an XMLElementWriter for themselves to handle this, see for exmaple:

https://github.com/wildfly/wildfly/blob/9de9217e0106da10c7d05228bcf0559c81b6042c/clustering/infinispan/extension/src/main/java/org/jboss/as/clustering/infinispan/subsystem/InfinispanExtension.java#L52

Ken 

My problem is that the XMLElementWriter is never called during startup.   I would like it to be called after the management model is read from standalone.xml but before deployments are handled.