Having done a little research on application server shutdown in order to answer a customer query I thought I would post my findings. WebSphere Application Server supports three shutdown modes: stop, stop immediate and terminate (in order of immediacy).
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Archive for the ‘Technology’ Category
Graceful shutdown
Friday, September 5th, 2008My first US patent
Thursday, September 4th, 2008Last week I had my first US patent issued: #7218708. The patent describes the use of the J2EE Connector Architecture to integrate a Java Message Service provider with an application server. This is something that is actually very easy to do with JCA 1.5 given the restriction of one JMS session per connection introduced by J2EE 1.4. However this patent describes a mechanism to use JCA twice (once at the connection level and once at the session level) that doesn’t require this restriction. This was first used in WebSphere Application Server V5 and continues to be used for the WebSphere MQ and generic JMS provider support today.
Connectivity restored
Sunday, August 31st, 2008Hurrah – our internet connectivity at home as finally been restored! Matters were complicated by PlusNet failing to mark the fact that we had a copper overlay when we took broadband from them so the line was still showing up as optical fibre. In the end I plumped for Zen Internet who, although far from the cheapest (we had to pay a £50 connection fee for example), have a reputation for good customer service and a one month minimum contract. Hopefully this should mark the return of normal service to this blog.
Fan error
Thursday, August 14th, 2008I opened up my ageing T42p laptop last night to be greeted by the ominous message “Fan error”. A quick Google using Christine’s machine revealed that I could bypass this warning simply by pressing escape. This set my mind at rest to a certain extent as a) it meant I could see that I hadn’t lost any data and b) I could copy off the information I needed for the next day. If this was going to happen, it couldn’t have happened at a much better time as I had just returned from my last customer engagement in Norway and was intending to spend today in the IBM office (where I have managed to borrow a machine – thanks Kristin!). Next week I’ll be back in Hursley where hopefully a quick repair can be arranged.
Locks and leaks
Thursday, July 17th, 2008I was called upon yesterday to review some WebSphere product code I wrote about six years ago. It was a bit of a shock to see from the change history the number of fixes that had been made in the intervening time! Many of these related to deadlock situations, often when I was merely taking a lock whilst I iterated over a set in toString or some such seemingly innocuous method. It is very hard to get the lock ordering correct when you are just a component in the middle of the stack. The lesson there is, I suspect, to only trace when entries are added or removed from the set and perhaps just give the size at other times.
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Configuring SIB J2SE client with SSL
Wednesday, July 16th, 2008If configuring the service integration bus J2SE client for SSL is a topic of interest to you then make sure you register for next week’s presentation from Rich Montjoy in level 2 service.
Dynamic JMS endpoints
Tuesday, July 15th, 2008In an earlier post I promised an example of where service integration bus mediations still have a role to play in a WebSphere ESB environment. WebSphere ESB currently only supports dynamic endpoints on an import or callout (those that can be changed at runtime by a mediation flow) for SCA and web service bindings. In this post I’ll show how a service integration bus mediation can be used to add dynamic behaviour to a JMS binding.
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Deployment environments during profile creation
Tuesday, July 8th, 2008Today I was trying to work out why a WebSphere ESB customer wasn’t seeing the default deployment environment created when using manageprofiles to create a Network Deployment topology. They had specified the appropriate topologyPattern and topologyRole parameters. It turned out that they were missing the ndtopology option which should be set to true. This was perhaps excusable as the help for the template doesn’t list this option and even the InfoCenter documentation manages to get the case incorrect. As on previous occasions, I spotted this omission by running through the graphical Profile Management Tool and comparing the parameters that it generates in the invokeWSProfile entry near the top of the logs/manageprofiles/<profile_name>_create.log file.
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