Which JRE is being used??

Recently I was assigned to take care of a web application developed by JSP, Javascript, struts & EJB. The source codes are compiled into different WAR, JAR and EAR files by using JDK 1.4.2_03. The App Server being used is JBOSS 3.2.3. I hava a lot of questions concerning the application in my mind. Here are some of them, Can anyone please help:
(1) From the Java Forums, I know that java applications need JRE to run. But I don't see the web application force me to install any JRE when I try to access it via IE6. Why?
(2) Is there any way (e.g. bat script) that I can know which JRE the web application is using? Can you provide me with some code samples?
(3) I read an artricle somewhere saying that JRE can be bundled to a web application. How can I now whether the JRE 1.4.2_03 is being bundle with my web application?
(4) Since the application is compiled by JDK 1.4.2_03, is this a must to use the JRE 1.4.2_03 only?
Thanks

Hi,
All Java compatible web/application servers like Tomcat/Weblogic/Websphere/JBoss ......have build-in JRE. That u dont need to care. You can find the version of jvm ....from the servers's Readme files and and the corresponding documents.
If your java application works fine with the web/app server means, the JRE is already installed.
Bye

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