Raible Designs

Subversion Hosting

In years past, I never had much of a need for source control outside of open source projects I worked on. Now, as I create more and more training materials and presentations - it's essential. While I could host a Subversion repository myself, it doesn't seem like it's worth the hassle. I'd prefer to have it hosted (and backed up regularly) outside of my house. This week I'm looking to setup svn.raibledesigns.com.

I'm not really looking to get my own Linux box hosted somewhere. I pay around $60/month to KGB Internet for raibledesigns.com, demo.appfuse.org and appfuse.org. To get my own "managed" box is somewhere around $300/month. When I say "managed", I mean Contegix-style where I can say "install this", "do that" and they handle all the sys-admin for you. So all I'm looking for is a reasonable SVN hosting provider that'll give me 1-2 GB for a reasonable price. What's reasonable? I'd say $25-50 per month.

I did some googling and there's a lot of Subversion hosting providers. I e-mailed a few of them with my main question - "can I point my subdomain at your servers?" A few of them have gotten back to me, but now I'm curious to hear from folks using these services. Are you using a Subversion hosting provider for your business? If so, which one?

I'm more interested in bad reviews than good ones - but if you're happy with a service, I'd love to hear about it.

The cheapest one I found is SVNRepository.com. However, it's been an hour since I e-mailed them and I haven't had a response. Nevertheless, $10/month for 5 GB, unlimited repositories, Trac instances, etc. sounds pretty nice.

Update August 2, 2007: I ended up going with SVNRepository.com (Level Two - $6.95/month) and I've been very happy with them. I'm using them for Raible Designs' artifacts (presentations, training materials) so I don't use it on a daily basis - more like monthly.

Upgrading to Ubuntu 7.0.4

You have to love how easy they make this.

The time doesn't seem accurate as it originally told me it'd be about an hour. Regardless, I love how easy it is to upgrade Ubuntu from one version to the next. I wish openSUSE had a similar feature.

Update - 3.5 hours later: This might take a while...

Update - during FAC: It's failed twice now and left my OS in a corrupted state both times. I suspect the MADM (or whatever it's called) prompt at the end of the download. I've entered "all" and "none" and it's failed with both values. VMWare rocks - I'm so glad I didn't ruin a working system. I'll be sticking with 6.10 for a month or so.

... and Country Bry is right - calling it by it's code name vs. the version number is pretty cheesy.

Pizza!

From Stephen O'Grady:

YouTube - MLB - A Fan throwing a pizza at another Fan
this was the game i was at, sorry i missed this; the best part comes when Remy and Orsillo start cracking up

We need to plugin in less, not more

From David Van Couvering's Blog:

I just returned from a week in Mexico, a wonderful time with my family where we lived very simply - food, rest, physical fun. No TV, no movies, no cell phones, no computers. Bright sunshine, beautiful beaches, very friendly people wherever we went.

Then I came home to San Francisco and straight to the Web 2.0 Expo. The contrast has been a bit disorienting. I don't think it's a surprise that my one year old son learned to say "Hi" in Mexico - people actually greeted him there and interacted with him. Here in the conference, on the BART train, on the street, we are all in our own world. We are on our laptops, our phones, our iPods.

The keynote talks at the Expo underscored again and again an undeniable trend: there is an ever growing explosion of the use of consumer devices and connecting to the Internet. The vast scales of data and connections we are looking at are almost impossible to imagine. The whole world is "getting connected." And those of us at the Expo are generally very excited, and see lots of opportunities to make money and and to build things that lots and lots of people will use.

But I feel a sadness when I find myself in this environment. I feel like I am losing something. I watch myself "plug in," and I feel like I am actually losing connection. I crave the open sky, the deep stillness and power of the ocean, of the smiles of people who said "Hi" to my son.

David makes some excellent points in this post. I often find that I get tied up in the virtual world of blogs and technology and forget that the real world is the one that really matters. If my computer died tomorrow and I gave it all up to help Julie remodel houses, I don't think I would lose a whole lot. In fact, I think I would be more in touch with reality and would likely strengthen friendships, rather than confuse people when I talk to them about what I do.

A commentor on David's blog says:

I am glad you discovered, or rediscovered, the beauty of simple things. It happens to many people almost every year, after vacations.

This is why I try to take at least 2 months of vacation each year. I've been doing it for around 5 years and I don't plan on changing that anytime soon. Sure, I have lots of opportunities to work my ass off, make a bunch of money and store it away for later. But that's no way to live - I want to enjoy life now and every day going forward. Sure, I'm saving money for my retirement, but I don't see the point in working like mad in hopes it'll payoff someday. Some folks say "do it while your kids are young." I think that's bullshit - there's no excuse for being a bad parent at any time in their lives.

Sonatype - a new company around Maven

From Jason van Zyl's Maven Diaries:

Since my departure from Mergere I've been quietly and steadily working to help start a Maven related company that I'm proud to say I'm a part of. No grandiose launch, no marketing hype, no VCs, haven't talked to a single analyst, and we hope that you can actually understand what we do by looking at our website. The company's name is Sonatype and I'm finally happy with the people involved and the direction we're headed in. We are focused on facilitating the adoption of Maven through our partners network, providing training, and delivering Maven related products for software development.

Having two companies wrapped around Maven can't be a bad thing. However, let's hope Sonatype has some funding to pay folks to work on the project more, rather than other products that may or may not be successful.

Two things that could make this company very well liked in the open source community:

• Clean up the Maven Repository: Add/delete/modify as requested by users. There's other projects using the repo now and even folks campaigning against Maven. If Maven folks are responsible for cleaning it up, they'll be heroes.
• Provide repository statistics: A lot of open source projects like to track their download statistics. It's a metric for measuring success (in addition to mailing list traffic). If they move to a full Maven-based distribution model (like AppFuse is), there's no more statistics.

Are there other things you think Sonatype can do to make Maven easier to use and more successful?

Congrats to Neel, Jason, John, Kenney, Andrew, Eric and Eirik. I hope you succeed in your mission. I think w/o the VCs and the get-rich-quick folks, it should be a lot easier. Cash isn't always the key indicator of success - more often happiness and job satisfaction are.

20 Things You Didn't Know You Could Do With Apache

During my mod_rewrite adventures, I discovered an interesting presentation by Rich Bowen from last year's ApacheCon. It's titled "20 Things You Didn't Know You Could Do With Apache" and you can download the PDF. While writing this post, I found a couple of other interesting presentations that Rich wrote: Introduction to mod_rewrite and Apache 2.2 Rocks! Good stuff Rich - thanks for sharing.

OSCache vs. EhCache for Hibernate's 2nd Level Cache

Hibernate has a number of options for configuring its second level cache. For more information on configuring this, you might want to read John Ferguson Smart's article titled Speed Up Your Hibernate Applications with Second-Level Caching.

Up until today, I thought EhCache was the default cache provider, but apparently not anymore. From Hibernate's documentation:

Note that versions prior to 3.2 defaulted to use EhCache as the default cache provider; that is no longer the case as of 3.2.

So what's the default now? It can't be Hashtable since that's not for production use. I doubt it's OSCache since OSCache can't even get its patches into Hibernate. Looking through the release notes, I found out it's NoCacheProvider - seemingly because of an issue with EhCache:

Due to the upgrade to EhCache1.2 and its new non-singleton cache setup, we should no longer default the cache provider to be ehcache. Instead, default to NoCacheProvider.

That's reasonable I guess. EhCache added support for distributed caching in 1.2. It's a shame they didn't maintain backwards compatibility or they'd still be the default caching provider. Regardless, it doesn't matter who the default caching provider is because it's very easy to change it. Here's how it's configured on one of my projects:

<bean id="sessionFactory" 
    class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="configLocation" value="classpath:hibernate.cfg.xml"/>
    <property name="hibernateProperties">
        <value>
            hibernate.dialect=${hibernate.dialect}
            hibernate.query.substitutions=true 'Y', false 'N'
            hibernate.cache.use_second_level_cache=true
            hibernate.cache.provider_class=org.hibernate.cache.EhCacheProvider
        </value>
    </property>
</bean>

Of course, you can also configure it directly in hibernate.cfg.xml or a hibernate.properties file.

This leads me to the reason for this post:

What is the best 2nd level (clustered) cache to use for Hibernate?
I'm sure some folks will say Coherence, so let's narrow the question to what's the best open source option?

I've used OSCache in the past. It worked well, but it was kind of annoying that I had to patch Hibernate to make it work. The Hibernate folks say it's OSCache's fault, the OSCache guys say it's Hibernate's fault - so this issue will likely never get resolved. So what about EhCache? I don't know, I've only used it in a single JVM environment and haven't tried it in a clustered environment. Is there anyone using Hibernate + EhCache in production that can verify its effectiveness?

Of the options listed in Hibernate's documentation, the only other options seem to be JBoss TreeCache and SwarmCache. You can quickly eliminate SwarmCache since it never made it past 1.0 RC2 in October of 2003.

That leaves JBoss TreeCache, EhCache and OSCache as choices for a clusterable 2nd-level cache. OSCache is an invalidating cache, which definitely works - but might not work as you expect it to. JBoss Cache only seems to allow a replicated cache which also works. EhCache seems to support both. I don't know if invalidating or replicating is better, but I imagine replicating can get quite chatty if you're dealing with large amounts of data.

But wait - is there another open source option? According to Terracotta's CTO, Terracotta is much faster than JBoss Cache. However, if you read about it on DZone, you'll see that JBoss Cache has no "official" benchmarks.

So what's a developer to do? My current client likes OSCache, but I'm leaning towards EhCache. Which would you recommend?

Of course, if Coherence is only $1K per CPU, maybe that's the obvious choice? Unfortunately, I couldn't find their pricing using Google.

Comparing Java Web Frameworks: Proposed Outline

I'm just now starting to create my Comparing Java Web Frameworks presentation for ApacheCon Europe. According to Dave, I'm way late on submitting my presentation. However, I haven't received any late notifications from ApacheCon's organizing committee, so I don't feel too bad.

I think it's interesting how most conferences don't spend much time organizing from a speaker's perspective. The Colorado Software Summit and NFJS are two exceptions. As a speaker, you always know exactly what's going on, what the deadlines are and where you're supposed to be when. With ApacheCon, I feel like I'm in the dark on almost everything - including if I have a hotel room or not. I guess that's the difference between a volunteer organization and conferences where the organizers make money.

Luckily, I've done this presentation quite a few times in the past, so it's mostly an update rather than a rewrite. The biggest changes: dropping Struts 1 and adding Stripes and Wicket. Of course, I could keep Struts 1 since it's not much additional work, but since I only have 50 minutes for the talk (10 minutes for QA), it makes sense to drop it. And yes, I know many of you'd like to see Grails, Seam, GWT, RIFE and Click added to this presentation - but no one wants to sit through a presentation on 11 web frameworks in 45 minutes.

Here's the abstract for the session:

One of the most difficult things to do (in Java web development) today is pick which web framework to use when development an application. The Apache Software foundation hosts most of the popular Java web frameworks: Struts, MyFaces, Tapestry and Wicket. This session will compare these different web frameworks, as well as Spring MVC and Stripes. It will briefly explain how each works and the strengths and weaknesses of each. Tips, tricks and gotcha's will be plentiful. Lastly, it will provide attendees with a sample application that utilizes all 6 frameworks, so they can compare line-by-line how the frameworks are different. This sample application will include the following features: sortable/pageable list, client and server-side validation, success and error messages as well as some Ajax functionality. The frameworks will be rated on how easy they make it to implement these features.

Without further ado, here's my proposed outline:

• Introductions (5 minutes)
• Pros and Cons (15 minutes, ~2 minutes for each)
• Sweetspots (10 minutes)
• Smackdown - evaluation criteria includes (15 minutes)
  • Ajax support
  • Bookmark-ability
  • Validation (including client-side)
  • Testability (esp. out-of-container)
  • Post and redirect
  • Internationalization
  • Page decoration
  • Community and Support
  • Tools
  • Marketability of skills (can it help you get a job)
  • Job count (is there a demand for skills on Dice)
• Conclusion (5 minutes)
• Q and A (10 minutes)

During the Pros and Cons, I won't be showing any code like I usually do - there's just not enough time. I'm also adding in a discussion on these frameworks' sweetspots. The Pros and Cons section is largely my opinion, and I think it's important to hear the framework authors' opinions as well.

In evaluation criteria, I'm dropping List screens and Spring Integration. All these frameworks have good Spring support and most support some sort of page-able/sortable list. I can add either of those back in based on your suggestions.

Any feedback is greatly appreciated.

Configuring Tomcat for Production

From The Atlassian Developer Blog:

You appear to be running Tomcat in development mode. (http://tomcat.apache.org/tomcat-5.5-doc/jasper-howto.html)

This means that source of every JSP is held in memory to provide detailed messages in the event of an error. If you have large JSPs this will hurt. It looks like this accounts for 50MB+

From Tomcat's Production Configuration documentation:

Seems like good information to know.

JSF still sucks?

Granted, this post about how painful JSF is is almost 6 months old, but I think it's still mostly true.

Want to compare times? More than three man-weeks have been spent fixing silly JSF navigation problems. A full CRUD AJAX interface with Spring MVC and prototype in the same project took four days, and there was no previous experience with Spring MVC.

If you're going to use JSF, I highly recommend Facelets or Shale/Seam. However, those are mentioned as well:

The default view technology is JSP, even when no one in the real world would recommend it; instead, use Facelets, or Clay, or some other non-standard framework. Not trying to be sarcastic here, since Facelets is pretty good, but this complicates the hiring and education of the team and in fact invalidates the selling point of Faces 'being a standard'.

IMO, Facelets is very easy to learn. If you know how to program JSPs with JSF, you should be able to use Facelets in under an hour. When we converted AppFuse's JSF flavor from JSP to Facelets, rarely did the body have to change - we just had to change from taglibs to XML namespaces.

When you are not working with persistent data (if you are living in a cave or developing wizard interfaces) there are two scopes to store model state: the session context, which raises concurrency issues and is not recommended by the Faces community, and the conversation/process/whatever context, which is not standard and imply installing shale or seam to put even more lipstick on the pig.

There's two problems with Shale and Facelets - the activity on these projects is very low. Shale still has its creators around, so even while its seldom used, you can probably still get your questions answered. However, Facelets seems to be suffering from "developer abandonment".

Conclusion: don't use JSF simply because it's a "standard". Use other frameworks that are more actively developed and designed for the web. For component-based frameworks, the most popular are Tapestry and Wicket. Less popular ones are RIFE and Click.

If you still want to use JSF, you should probably use Seam, but don't simply use JSF because it's a standard. If it was a de-facto standard, that'd be another story.

Of course, you could also help improve JSF 2.0. But that's not scheduled for release until late 2008. I'm sure 2 or 3 commentors will claim we'll all be using Rails or Grails by then.