Re: 9i database: Java?

Thanks,

You state:
"> You don't need to use Oracle's 9iAS or the Oracle supplied Apache server
> (unless the tag library you are running includes Oracle specific tags).
> But you may want to consider using one or the other instead of going to
> the alternatives JVM/J2EE engines (WebSphere, BEA, Orion, JBoss, etc.)."

As far as I know Apache simply forwards all request for JSP's and SERVLETS to Orion (=the J2EE server bought by Oracle). Apache only handles static pages and security. Or is Apache capable of running the JSP's / SERVLETS?

Regards
Stephan

"Hans Forbrich" <forbrich_at_telusplanet.net> wrote in message news:3EC985FA.A4E6EAC8_at_telusplanet.net...
> Answered in 3 parts: JVM, J2EE in Oracle, J2xE & JSP. This is a very
> high level summary - others will find holes, but this (hopefully) will
> provide the concepts.
>
> Stephan wrote:
>
> > Hi,
> >
> > Can someone explain me what JVM really means?
>
> 1) JVM = Java Virtual Machine.
>
> Java's claim to fame is programmer independance from the underlying CPU
> architecture (SUN Sparc, Intel X86, HP Risc, ARM, etc.) The way they do
> this is providing a virtual computer to execute the Java code and then
> having that virtual computer (or virtual machine) responsible for
> translating the results into the native computer op codes. Side note -
> since this translation is not perfect, Java is occasionaly known as
> write once, debug everywhere.
>
> > Can I run JSP's directly in the database or do I need 9iAS?
>
> 2) J2EE in Oracle
>
> You need a JVM with the J2EE and appropriate JSP tag libraries.
> Oracle8i provided the JVM in the database, AFAIK it's been removed from
> the database but is still available with automatically installed Apache
> server in 9i. (see below for J2EE & JSP def's)
>
> You don't mention your operating system - if Windows, check the program
> group to see whether you have a 'start/stop apache icons. If so, start
> & see whether you can get a page from
> "http://{substitute-your-machines-name}:7878
>
> You don't need to use Oracle's 9iAS or the Oracle supplied Apache server
> (unless the tag library you are running includes Oracle specific tags).
> But you may want to consider using one or the other instead of going to
> the alternatives JVM/J2EE engines (WebSphere, BEA, Orion, JBoss, etc.).
> I believe I get better support having a single vendor (read 'single neck
> to choke') than having the vendors passing the buck.
>
> > Additional (global) info concerning Oracle 9i database and Java is
> > welcome...
> >
> > thanks
> > Stephan
>
> 3) J2xE & JSP
>
> Java is a very small and simple language. So small, in fact, that it
> doesn't really have a lot of intrinsic functionality. As a result,
> people have written a lot of libraries to provide the functionality they
> want.
>
> There are 3 'standard' libraries that are very interesting - J2ME, J2SE
> and J2EE.
>
> J2 originally stood for Java version 1.2 (the 2 part) as there were a
> lot of very important enhancements to the core Java engine between
> verions 1.1 and version 1.2
>
> - J2ME is the Mobile Engine built on the Java 2 (version 1.2) VM. This
> is the one people use when demonstrating paying for their Coke using a
> cell phone.
> - J2SE is the Standard Engine. It's designed for standdaleone systems
> with a visual user interface. A big part of the standard incudes GUI
> related stuff.
> - J2EE is the Enterprise Engine, designed to work in the 'back office'.
> This is where Oracle, IBM WebSphere and BEA compete.
>
> J2EE is a specification - current version is 1.3 (final draft for 1.4 is
> available). This spec includes a lot of interesting stuff like JNDI
> (directory interface,) JDBC, transactions, etc. Version numbers get
> real confusing here because the J2EE spec makes reference to specific
> versions of JNDI, JDBC, JTS, etc.
>
> All sorts of detail is available at http://www.javasoft.com
>
> Java Server Pages run in the J2EE environment. Easiest way to think
> about them - start with a web page template, add "tags" that are part of
> the JSP tag library. Each tag refers to some specific functionality
> such as 'select x from table y', or other function that can be done in
> Java. (tags look at lot like the paragraph tags in HTML pages)
>
> When the user requests a Java Server Page, the J2EE engine passes the
> request to the JSP engine [portion of J2EE] which expands the tags and
> then executes the resulting file. The results are then returned,
> usually as a pure HTML page, back to the requesting system - user's
> browser.
>
> HTH
> /Hans
>
Received on Tue May 20 2003 - 03:00:03 CDT