> First, am I correct in saying that the default behaviour for a > Javabean is > that each servlet or JSP that uses it will create a new instance of that > Javabean ? For example, if we have Register.jsp which uses a Javabean > called memberData.java then if 2 people were to submit data to > Register.jsp > at exactly the same time, each page would actually create and use > a separate > instance of the bean memberData.java. Is this correct?
Nice answer: That depends :-) a) <jsp:useBean id="mb" class="MyBean" scope="page" /> The bean is created for exactly this page executed by this user b) <jsp:useBean id="mb" class="MyBean" scope="request" /> The bean is created for this page and all pages you <jsp:include> in this request. c) <jsp:useBean id="mb" class="MyBean" scope="session" /> The bean is created and accessible by all pages of this application (You must include this line into all pages) p.ex.: You create a session bean that accesses a database. The database connection will be made once and will stand until the session runs out. There is a seperate bean for every user, though. d) <jsp:useBean id="mb" class="MyBean" scope="application" /> The bean is created the first time a user accesses a page in your application. From then on, every user and every page will have the same bean! > Second, if this is the case, how do you actually create a shared bean and > why would you want one ? You just have to set a bean's scope to application. Try to think of desired uses yourself, I don't want to set up an example right now ;-) > Third, I'm getting confused and starting to doubt my understanding of > servlets within the Tomcat servlet container. If we have a simple servlet > using the helloWorld.class and it just prints "hello world" to > the web page, > then if 10 people were to requsest the servlet at the same time, am I > correct in assuming that 10 different instances of the class are > created to > handle these requests ? true > Sorry for these seemingly basic questions but I'm going through > one of those > stages where I question the fundamental understanding. I must go read the > servlet API I think. I could recommend a german book here, but I think that wouldn't be of great use for you... I think everybody has these phase where he thinks he would never understand this big pile of information, I currently go through this phase on SOAP ;-) May the clouds over JSP-valley vanish ;-) Alexander -- To unsubscribe: <mailto:[EMAIL PROTECTED]> For additional commands: <mailto:[EMAIL PROTECTED]> Troubles with the list: <mailto:[EMAIL PROTECTED]>
