Raible Designs

Test your Java Knowledge

Did you know you can test your Java knowledge over at java.sun.com? They have all kinds of quizzes, most of them from books. They seems to be similar to certification exams to me - read the book and you'll ace it - otherwise, you have a decent chance of passing based on your knowledge. Can make you feel good or humble you, it's your choice. I was humbled...

RE: The Rocky Mountain Software Symposium

The Rocky Mountain Software Symposium definitely looks like a good time. I'll be attending with bells on. Any other bloggers making the trip? It's about a 10 minute drive for me. ;-) Gordon writes:

The Rocky Mountain Software Symposium not only looks like an awesome speaker lineup, it looks like a large number of bloggers are speaking: Ted Neward, James Duncan Davidson, Erik Hatcher, and Bob Lee. I've submitted my training req!

The sessions look awesome, should be a good time.

Java powers ready.gov!

I'm sure you've heard of the new ready.gov website by now. I found out on one of the first pages that it's written using JSPs. I like the site design too - looks good. I don't know that I'll read it, but it's good to see such a professional looking site.

JSP 1.2 <-> JSP 2.0

Here's something that I need: A way to convert JSP 1.2 pages to JSP 2.0 pages. Basically, this only really involves changing all the <c:out value="${...}" /> tags to be simply ${...}. I have a couple motivations for this. The first is that Wrox wants struts-resume and security-example to be written using JSP 2.0 (it is a JSP 2.0 book after all). However, I'm afraid that most developers won't be able to use 2.0 for quite some time, considering that the J2EE 1.4 (with JSP 2.0) won't be released until this summer. So I'd like a way to create a JSP 1.2 version and a JSP 2.0 version of my these applications from the same source code. What would be best - to write the source in JSP 1.2 and then parse it for <c:out /> tags and strip them accordingly? I'd rather write the source in JSP 2.0 and then add in the <c:out /> tags using Ant, since it'd be much simpler. Then again, I've already written a fair amount using JSTL with 1.2. Comments and suggestions are encouraged!

ModelJ Code Generator

ModelJ looks like an interesting tool if you're using Struts, EJBs and JBoss.

ModelJ is a RAD (Rapid Application Development) tool that uses code generation to create complete J2EE designs using the Struts and EJB frameworks. With ModelJ, you are only a few steps away from a complete application readily deployable to JBoss, the leading open-source J2EE Application Server. ModelJ uses proven design patterns to ensure a robust, easy-to-maintain design.

Keep your JVM Running with JSW

Carlos's post about Java Service Wrapper might be just what I'm looking for. This site seems to have stabalized a bit thanks to Keith's Perl script that checks for OutOfMemory errors (I can see that Tomcat gets restarted a few times a day). I think it's Roller, but I'm running a November version of it, so that's probably the issue. I plan on upgrading this weekend and then we'll see what happens. In the meantime, I'm going to let Keith know about JSW, seems like a very useful tool. Thanks for the tip Carlos!

StrutsCX: Updated

I received the following e-mail from Berny, the author of StrutsCX.

Thanks Matt for hosting a StrutsCX sample. As the author of StrutsCX I do have some news for you: There is a new release with support of FOP/PDF, client side XSLT, XSL pipelineing and included Struts Validator. Check out http://it.cappuccinonet.com/strutscx.

Would be great if you could update on the latest version. Would you mind if I put a link on the StrutsCX Homepage to the Demo?

Thanks,
Berny

I actually upgraded my demo site when I received his e-mail on Saturday, but didn't get around to returning his e-mail until today. I dig the Validator stuff - only seems to be server-side though.

Easy Windows Authentication with Tomcat 4.x

The original blog entry by Robert Rasmussen has disappeared from the Internet (cannot find server) so I'm reproducing it here via Google's caching feature. I've made a few changes to pretty up the formatting, but that's about it.

I've been pulled into a little internal project, and one of the requirements is that users should be able to authenticate with their Windows login and password. IIS may or may not be in the picture.

Since the server is a Windows 2000 machine, this turns out to be extremely simple to do thanks to Andy Armstrong's JAAS login modules.

Once you've downloaded the login modules, set your classpath accordingly and make sure that the directory holding NTSystem.dll is in your %PATH% variable. Next, in the "Sample config" folder you'll find a tagish.login file and a java.security.sample file. The last line in the .sample file is significant, and it needs to be in your $JAVA_HOME/jre/lib/security folder (in a file named java.security). You should copy the tagish.login file there as well. If your users will always be logging into the same domain (which is the case in my situation), just set the defaultDomain property in tagish.login, like this:

NTLogin
{
    com.tagish.auth.win32.NTSystemLogin required returnNames=true returnSIDs=false defaultDomain=YOUR_DOMAIN_HERE;
};

Now, all you need to do to use Windows authentication in your webapps is to make one addition to your server.xml file (or to your specific context's definition):

<Realm className="org.apache.catalina.realm.JAASRealm" debug="99"
       appName="NTLogin"
       userClassNames="com.tagish.auth.win32.NTPrincipal"
       roleClassNames="com.tagish.auth.win32.NTPrincipal" />

I'll admit this config is slightly hokey. If you look at the Catalina JAASCallbackHandler (which is hardwired to JAASRealm), the way that I have the realm configured above pretty much counts on the User principal (in effect, the user name) being the first principal returned. This is evil, but it works. It would be nice if either Catalina allowed a pluggable CallbackHandler so that I could take advantage of the NTPrincipal.getType() method or if Andy's code returned subclasses of NTPrincipal like UserPrincipal or GroupPrincipal that I could specify in server.xml.

Once you've got this all configured, the various groups your users belong to equate to role names (so if I belong to an administrators group, my authenticated user will be in role "administrators"), and you can configure security in your webapps using these roles.

Comparative analysis of Struts vs. WebWork vs. Barracuda vs. Maverick?

Does anyone know of a comparative analysis of Struts, WebWork, Barracuda and Maverick. I'd love to find a paragraph or two that I could quote in my chapter on Struts. I'm not at all attempting to say that Struts is better than any of these - I just want to give a fair shake to each one. The reason I'm writing this chapter on Struts is because that's what I'm most familiar with.

Thanks,

Matt

Struts 1.1 RC1 To Be Released Soon

The Struts Committers are voting on a release plan for a 1.1 Release Candidate. Lots of +1's so far, so I'd expect it in the next couple of days. The release plan says tomorrow is the code freeze date.