jsp and java servlet

umeshtangnu

why every time i want to run my program again i need to refresh my apache server(compile java servlets )? if i didn't do that it will cause me these errors

java.lang.NullPointerException
coreservlets.Database.doGet(Database.java:79)
javax.servlet.http.HttpServlet.service(HttpServlet .java:689)
javax.servlet.http.HttpServlet.service(HttpServlet .java:802)
org.apache.catalina.servlets.InvokerServlet.serveR equest(InvokerServlet.java:419)
org.apache.catalina.servlets.InvokerServlet.doGet( InvokerServlet.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet .java:689)
javax.servlet.http.HttpServlet.service(HttpServlet .java:802)

any one can tell me whats going on ?
should i show my code as well ?

mike_phi

Hi there just wanted to get some info with regard to java servlets, first of all is it common for hosting companies to support servlets, e.g. are servelets supported here.

just wanted to fin out how widely they are used, I had a look at some servlet literature and it seems to be a fantastic solution for server side programming.

seeing that you are using apache which I do too what configuration is required on the apache server, is it as easy as enabling php : (

just thought you could give me some pointers or point me in the right direction with regard to setting up and where i should copy required files eg servelet jar and my servlet class files with regard to the apache directory structure.

cheers Mic

MrBlueSky

Here is an excellent article introducing Java Servlets. What they are, how to set up servlets and what they can be used for: http://www.linuxjournal.com/article/4576
It focuses on Linux though.