>i am new to this group and servlets
at the moment im doin my degree in computer programming in ireland and for my final year project i have decided to do something that utilises servlets and XML but if i want to use credit cards i have to use security
i would very much appreciate it if someone out there could tell me something about security in java and what security i wil require
colin
>Do you mean you are developping without access to the servlet container >console? Which servlet container do you use? If you use Tomcat or other >container that can run in standalone mode, you should probably install a >local copy for testing purpose. If you really can't, you can log debug info >and read it from your server. You can do this several ways. You can write >the debug info to disk and read it through another servlet, or you can use a >database, or you can use a static counter to count requests, or you can >simply add a member variable to your servlet. This is the easiest way, >although not very reliable, but it should at least give you some info. > >Just add an int member to your servlet, increment it in the doGet method an >display it in the response. This way, you will know if the servlet is called >more than once (unless the servlet is unloaded and reloaded by the >container). > >Pierre-Yves > >-----Message d'origine----- >De : A mailing list for discussion about Sun Microsystem's Java Servlet >API Technology. [mailto:[EMAIL PROTECTED]]De la part de >Graham, Billy >Envoyé : mardi 18 septembre 2001 14:24 >À : [EMAIL PROTECTED] >Objet : Re: Inconsistent behaviour in Servlet output > > >Hi Pierre-Yves, > >Excuse my ignorance, but how do you get a console window displayed when a >servlet is running? I can do this OK with a java application but have never >seen a console appear during servlet execution? > >Thanks, Billy. > > > >-----Original Message----- >From: Pierre-Yves Saumont [mailto:[EMAIL PROTECTED]] >Sent: 18 September 2001 10:37 >To: [EMAIL PROTECTED] >Subject: Re: Inconsistent behaviour in Servlet output > > >Hi, Billy, > >Did you check how many times the request is issued ? You can check this by >including a System.out.println("....") in you servlet and look at the >console to see how many times it is displayed for each "single" request. (I >don't know about Adobe SVG add-in, but this was the source of a bug with the >Adobe Acrobat plug-in). > >Pierre-Yves > >-----Message d'origine----- >De : A mailing list for discussion about Sun Microsystem's Java Servlet >API Technology. [mailto:[EMAIL PROTECTED]]De la part de >Graham, Billy >Envoyé : mardi 18 septembre 2001 09:36 >À : [EMAIL PROTECTED] >Objet : Inconsistent behaviour in Servlet output > > >Hi to all. > >I have a problem that I've been trying to overcome for a number of days now >and cannot see what is going wrong - hopefully someone will be able to point >me in the right direction. I am still fairly new to servlets so please >excuse me if the problem I pose is basic. > >I have written a servlet that queries a database, extracts the data and >writes the data to the client (MSIE5.5) as SVG (XML) where it is displayed >as graphs by the Adobe SVG add-in (V2). All this works perfectly - most of >the time! Sometimes the graphs do not display in the correct position, >totally messing up the display. To source the 'bug' I have written out >various variables to a file on the server and examined them afterwards. >Basically some of the variables I am using as counters, to place the graphs >on-screen, occasionally change value 'for no reason at all' that I can >determine, certainly I am not changing them directly in my code. > >I use doGet() to send my data request to the servlet from a web page. This >usually works fine, but if I edit the URL data directly, in the client >browser address line, to select different data then the resultant graphs are >usually not displayed correctly (i.e. the file shows the counter variables >have incremented incorrectly). If however I then click on 'REFRESH' on the >client browser (with the manually edited URL still in force) the new graphs >then display OK on the second time of asking. This behaviour seems to be >consistent. The only clue to what is going on is that the web server >displays two messages during the erroneous manual editing phase but only one >message during the 'good' REFRESH phase. I have displayed the messages below >in full but I have to admit I only have basic knowledge in this area so am >not sure what they mean. Can anyone please point me in the right >direction??? > >Manual Editing messages (2 off) : >[1]: >Tue, 18 Sep 2001 08:02:01 GMT+01 localhost/127.0.0.1 - >80: GET >/servlet/QSee4?Dep=BG&Ana=PLUTO&Controls=VER1&Tests=Na&Tests=CL&Tests=Ca >HTTP/1.1 >200 OK 4080 >[2]: >Tue, 18 Sep 2001 08:02:02 GMT+01 localhost/127.0.0.1 - >80: GET >/servlet/QSee4?Dep=BG&Ana=PLUTO&Controls=VER1&Tests=Na&Tests=CL&Tests=Ca >HTTP/1.1 >200 OK 68138 > >REFRESH message (1 off) : >[1]: >Tue, 18 Sep 2001 08:03:13 GMT+01 localhost/127.0.0.1 - >80: GET >/servlet/QSee4?Dep=BG&Ana=PLUTO&Controls=VER1&Tests=Na&Tests=CL&Tests=Ca >HTTP/1.1 >200 OK 4080 > > >Many thanks in anticipation. > >Regards, Billy Graham. > >___________________________________________________________________________ >To unsubscribe, send email to [EMAIL PROTECTED] and include in the body >of the message "signoff SERVLET-INTEREST". > >Archives: http://archives.java.sun.com/archives/servlet-interest.html >Resources: http://java.sun.com/products/servlet/external-resources.html >LISTSERV Help: http://www.lsoft.com/manuals/user/user.html > >___________________________________________________________________________ >To unsubscribe, send email to [EMAIL PROTECTED] and include in the body >of the message "signoff SERVLET-INTEREST". > >Archives: http://archives.java.sun.com/archives/servlet-interest.html >Resources: http://java.sun.com/products/servlet/external-resources.html >LISTSERV Help: http://www.lsoft.com/manuals/user/user.html > hiGet your FREE download of MSN Explorer at http://explorer.msn.com
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