The JSP Files (part 7): Bugs, Beans And Banks

How about JSP files part 9 on architectural considerations. Like when and how to use beans, EJBs and servlets together with the JSP??

I Second the notion! Let's see a little on the Model View Controller architecture for java beans, jsps, and servlets.

Anyway to catch compile errors in the same way like php or do you just have to have a special compiler for jsps like forte?

<p>I agree. I think one of the most attractive things about the JSP/Servlet architecture is it's ability to provide clean, well-seperated designs, so more coverage on how to design an application with these technologies would be very cool. Perhaps a longish article covering one example the whole way through that shows something like a really simplistic bank account or something.</p>

I like the articles so far, however, you should specifically point out that the UseBean, SetProperty and GetProperty tags for JavaBeans are XML compliant tags, hence the closing hashs. This is because we can concurrently initialize bean properties from the .xml file in the bean package as well.
Most non-programmer web dev's are not yet familiar with the intricacies of xhtml compliant tags. Just a thought.

More Power and keep em coming! -E-

Ryan, If your web server is set up to run .jsp's, than the pages are compiled as part of the package. (On Apache, this is usually the Tomcat engine.) The JSP engine in use is really a servlet implementation, set just to compile and run .jsp pages, and hence upcasts the Throwable object of the java.util package just like everything else in java seems to (after all, exceptions are built into java and are not ignorable).

Hope this helps ;)

-E-

Well, I agree, the momentum is in place, run with it, right?

The MVC architorture in .jsp is really to implement a Enterprise Java Bean (EJB) so that the (vendor-supplied) container of the EJB implements all the trivial tasks.

There is a good tutorial .pdf at jguru.com (also available at Sun's java site..) which has several examples on .jsp and EJB use. Also having a simple banking implementation. So I'm not sure if they wanna follow suit on that, but maybe something more realistic for web use...

How about how to use .jsp's to talk with Jini-enabled devices, or output WML or XML. Lets go for broke!

-E-

Hello,

Can you give provide the urls to those tutorials? Thank you!!

-- Rodney

Hi!! I have been through the 7 part tutorials thoroughly and it has helped me a lot in terms of understanding JSP's. (Much better than any book that I have read). I only have one problem with the last part i.e. using a bean. I downloaded the Temperature.class file and I am not sure which directory to place the class file in. Because the JSP on execution gives an error "Unable to compile class for JSPF:\tomcat\work\localhost_8080%2Fexamples\_0002fdevshed_0002ftemperature_0002ejsptemperature_jsp_0 .java:63: Class devshed.Temperature not found."

Hi!! I have been through the 7 part tutorials thoroughly and it has helped me a lot in terms of understanding JSP's. (Much better than any book that I have read). I only have one problem with the last part i.e. using a bean. I downloaded the Temperature.class file and I am not sure which directory to place the class file in. Because the JSP on execution gives an error "Unable to compile class for JSPF:\tomcat\work\localhost_8080%2Fexamples\_0002fdevshed_0002ftemperature_0002ejsptemperature_jsp_0 .java:63: Class devshed.Temperature not found."

though i couldn't get a few things to work, i learned a lot from the article & examples.
great job. keep 'em coming.

-hari

you can put in :
"D:\jakarta-tomcat-3.2.1\webapps\root2\WEB-INF\classes\" directory.

substitute "D:\jakarta-tomcat-3.2.1" with your own root & tomcat home dir.

well that doesn't work for me..
[root@local jsp]# locate Temperature.class
/usr/src/jakarta-tomcat-3.2.1/webapps/admin/WEB-INF/classes/Temperature.classt
Internal Servlet Error:
org.apache.jasper.JasperException: Unable to compile class for JSP/usr/src/jakarta-tomcat-3.2.1/work/localhost_8080%2Fexamples/_0002fjsp_0002ftmp_0002ejsptmp_jsp_1.java:63: Class jsp.Temperature not found.
Temperature c = null;
Any clues there? jsp.Temperature, does that mean it should be in a jsp subdir?
Also it sez it cannot compile class, but it's already there..
And oh yes, very informative, the JSP Files series, ta!

>you can put in :
"D:jakarta-tomcat-3.2.1webappsroot2WEB-INFclasses" directory.

>substitute "D:jakarta-tomcat-3.2.1" with your own root & tomcat home dir.