Posted by arungupta
on December 13, 2007 at 6:27 AM PST
I presented on GlassFish and other
related technologies (Metro ,
JRuby ) in
Bangalore, Chennai and Pune
week . The slides used during the preso are
here . And here is the list of questions (along with answers) for you:
- What does WSIT offer ?
WSIT stands for Web Services
Interoperability Technology. It is a component of
Metro - the Web services stack in
GlassFish. WSIT specifically provides support for
Security, Reliability, Transactions and interoperability with .NET 3.0. A
screencasts are availabl e to get you started with Metro and enable all
the enterprise features mentioned using
NetBeans IDE .
Is Metro plugin available for NetBeans version < 6.0 ?
Yes, Metro plugin is available for NetBeans 5.5.1. This is clearly explained
#ws4 . NetBeans 6.0 is now
released and is the recommended version of the IDE.
- How do I use LDAP for authentication while using Metro based web service
(with Security Token Service) interoperating with .NET web service?
Security Token Service (STS) can be configured for LDAP authentication. STS
service end can be protected with
Sun Java System
Access Manager web service agent (JSR 196 plugin). It can validate and
authenticate the incoming user name token (username / password) against
configured LDAP store at STS service side (when Access Manager is hosted as
STS) and then issue the corresponding SAML token. You could also write
AuthenticationValidator plugin to STS service, that can access and validate
incoming username / password against Access Manager LDAP store using
Manager Client SDK .
- Do Metro support Kerberos?
Metro 1.0 does not support Kerberos. However the
latest nightly builds of Metro provide
Kerberos support .
- I want to contribute to GlassFish. Which areas can I contribute?
Yes, GlassFish is 100% open source and encourage committers.
Some of the ideas are available
Please feel free to suggest any contributions at
- What Ruby features are getting into Java language?
If Java closures proposal is accepted
then that will be a Ruby feature.
- Does jMaki take care of browsing history ?
jMaki does not support browser history yet but this feature will be made
available as an extension in
the near future.
- Is jMaki extensible ?
Yes, read how jMaki framework can be extended as explained
- What is the performance impact of using jMaki ?
jMaki.js is the initialization script (18kb) for jMaki that is
loaded when the web application is loaded. This script provides
multiple features, included but not limited to:
- support for common event model between widgets from multiple
- Dynamic Container at component level - allows to resize the
- doAjax call (allows to asynchronously invoke services from back end)
- inspect (2-level deep inspection of object)
- logger & debugging (log all publish/subscribe events and other
messages to enable debugging)
- namespace API (allows to namespace all the widgets for clean
The jMaki wrapper is a minimal code that needs to be written anyway to
invoke the code anyway so there is no additional overhead there.
Is Comet supported in GlassFish/jMaki?
Yes, read about Comet support in GlassFish
The Grizzly Comet and
Writing a Comet application using GlassFish . Also try a simple sample
that demonstrates how
jMaki and Comet (read the
explanation ) work nicely with each other.
Can GlassFish deploy EJB 2.0 apps ?
GlassFish is Java EE 5 compliant which maintains backwards compatibility
with J2EE 1.4 and so EJB 2.0 applications can be deployed.
Do GlassFish support Active and Passive cluster ?
In GlassFish the cluster instances talk to each other for health monitoring
through GMS (of Shoal ). The buddy
instances talk to each other for replication of the session state. When a
failure is detected the LoadBalancer can failover the request to any
instance in the cluster. The session in question will be fetched from a
replica to this instance in order to continue the conversational state of
the session. In this sense, we have an active cluster.
GlassFish does not have a concept of a standby or passive cluster which will
take over when an active cluster fails altogether. That is usually
considered a high cost approach for redundancy and not advisable.
Read more discussion
Can we add a Metro Web service wrapper be created around
EJB 2.0 ?
Nope, Metro Web service wrapper can be created around EJB 3.0 only.
How can an application deployed on WebLogic be migrated
to GlassFish ?
helps automate the migration of J2EE/Java EE applications to GlassFish.
Can Entity beans be configured only as read-only beans -
caching server for these beans ?
Yes, read about the
characteristics, good practices, how to deploy and refresh read-only
How can jMaki applications run behind the firewall ?
Add the following Servlet parameters to web.xml:
This is described in detail at