RE: Centralized user management system
Hi Gang, We realised this 3 years ago when we started developing web applications for the company. So what we did in the first part was to develop our user management system onto our application framework. All our applications refer to the User object that goes across the applications. Management is done on a web front. Each new application has a defined user accessiblity table that defines who has access to that application. Might not be standard, but it works :) Regards, Cheong Takhoe -Original Message- From: Gang Wu [mailto:[EMAIL PROTECTED] Sent: Tuesday, October 28, 2003 4:01 AM To: Tomcat Users List Subject: RE: Centralized user management system Yes, I need a program to maintain a centralized user database, then the later developed applications don't need invent their own user management module anymore. Instead the applications can reference the user information directly or via Tomcat JDBC Realm. There was an article published on Java World (http://www.javaworld.com/javaworld/jw-06-2001/jw-0615-tapestry.html), which introduced a system called Tapestry which does what I want, but the connection to the download site was removed. Is there anybody knows what happened there? I also saw some commercial systems, usually very expensive. There is an inexpensive one from http://cafesoft.com/ . The price for 5 concurrent licenses is $2,995. Is there anybody has experience with it or similar systems? Thanks Gang -Original Message- From: Shapira, Yoav [mailto:[EMAIL PROTECTED] Sent: Monday, October 27, 2003 1:52 PM To: Tomcat Users List Subject: RE: Centralized user management system Howdy, It sounds like you're looking for a complete standalone user management program to talk to your database. Tomcat doesn't have such a thing, as that's not tomcat's job to provide ;) Yoav Shapira Millennium ChemInformatics -Original Message- From: Gang Wu [mailto:[EMAIL PROTECTED] Sent: Monday, October 27, 2003 1:46 PM To: Tomcat Users List Subject: RE: Centralized user management system Hi Yoav, Thanks for the message. The JDBC Realm provides a way to connect to an external user management system, so applications can verify user privileges in a standard way. But Tomcat does not provide any mechanism to manage users and roles, which is supposed to be implemented in the external user management system. And that's what I am looking for. The procudt should provide mechanisms to define application user management model, usually User/Group/Role/Permission model. It should also provide interface (either web interface or stand-alone application) to maintain the defined model, such as add/remove user, assign/revoke privileges to user. People might suggest to use the Tomcat Admin service which provide web interface to maintain the user/role pairs. But that's too simple and not easy to maintain. Also the data is stored in the deployment file, but a DBMS storage is obviously preferred by most developers. Or is there a better Tomcat solution I did not know? Thanks Gang Wu -Original Message- From: Shapira, Yoav [mailto:[EMAIL PROTECTED] Sent: Monday, October 27, 2003 11:16 AM To: Tomcat Users List Subject: RE: Centralized user management system Howdy, Tomcat can run with a JDBC Realm to authenticate users and define roles, and that likely has all the features you need. http://jakarta.apache.org/tomcat/tomcat-4.1-doc/realm-howto.html#JDBCRe a lm Yoav Shapira Millennium ChemInformatics -Original Message- From: Gang Wu [mailto:[EMAIL PROTECTED] Sent: Monday, October 27, 2003 11:07 AM To: Tomcat Users List Subject: Centralized user management system Hello everyone, I have several applications running on Tomcat server. When developing the applications, each development team invented their own user management system(basically a set of database tables and web interface). Now we got into this kind of awkward situation: User has to remember different users/passwords for each applications and login for every applications. We are going to develop some new applications and also need user authentication. To avoid the multiple users/passwords problem, I'm looking for a system to centrally manage users for multiple applications. Does anybody know if there are any free or inexpensive systems I can use? It's not possible for us to pay $100,000 for this kind of system. I took a look at the Tomcat user/role access control system, but I think it's too simple for any application permission management. Am I wrong? Thanks Gang - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied
RE: OutofMemoryError
Hi, Does this parameter -Xincgc, incremental garbage collection work for Tomcat 3.1 and Tomcat 3.2 ? I have two installations running on Java 1.2.2 regards, Cheong Takhoe -Original Message- From: Laurent Féral-Pierssens [mailto:[EMAIL PROTECTED]] Sent: Thursday, May 02, 2002 1:36 AM To: 'Tomcat Users List' Subject: RE: OutofMemoryError Hi Matthew, I have been experiencing the same problems but with T3.2.x. You should try to use Tomcat options -Xms and -Xmx I added those 2 lines: TOMCAT_OPTS=-server -Xms256m -Xmx256m -Xincgc export TOMCAT_OPTS in my /etc/init.d/tomcat script This increase the default heap size of the JVM to 256Meg (from 64Meg) and make sure incremental Garbage collection is done. Since I changed those, I have no more OutOfMemory errors. Hope it helps, Laurent -Original Message- From: Matthew Boeckman [mailto:[EMAIL PROTECTED]] Sent: May 1, 2002 12:08 PM To: [EMAIL PROTECTED] Subject: OutofMemoryError Hello List. I'm running tomcat 3.1.1 on RH7.1, kernel 2.4.9-31 with JDK1.3.1, mysql 3.23.43 I am occasionally seeing tomcat go postal with the following errors: Exception in thread CompileThread0 java.lang.OutOfMemoryError: requested 32760 bytes Another exception has been detected while we were handling last error. No information available. Please check ERROR REPORT FILE for further information, if there is any. Good bye. An unexpected exception has been detected in native code outside the VM. Unexpected Signal : 11 occurred at PC=0x419852cb Function name=(N/A) Library=(N/A) NOTE: We are unable to locate the function name symbol for the error just occurred. Please refer to release documentation for possible reason and solutions. Current Java thread: Another exception has been detected while we were handling last error. Dumping information about last error: ERROR REPORT FILE = (N/A) PC= 0x0x419852cb SIGNAL= 11 FUNCTION NAME = (N/A) LIBRARY NAME = (N/A) Please check ERROR REPORT FILE for further information, if there is any. Good bye. Any thoughts on what might be the cause? There is nothing in the log files to tell me more than this, which gets dumped to the console. -Thanks! -- Matthew Boeckman(816) 777-2160 Manager - Systems Integration Saepio Technologies == == ...Many say that DOS is the dark side, but actually UNIX is more like the dark side: It's less likely to find the one way to destroy your incredibly powerful machine, and more likely to make upper management choke. -Lore Sjoberg -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED]
Authentication Servlet
Hi folks, I'm thinking of coming out with a Servlet that resides on my Tomcat that would receive user/password details from the clients and sends back whether the user is authenticated or not. But this design would not be confined to Java -or- web applications. I want to use TCP/IP so that clients from other platforms/technology could also (i.e. asp, VB clients) could also communicate with this Servlet as well. Now I know this seems quite simplistic since I don't really know how to proceed. Would really appreciate it if someone out there could provided me with a few pointers of what to look out for. Several things:- - Do I need to set my own protocol? - When I extend the generic servlet, what operators would I need to override.. Is there any resource available out on the net/mailing-list about this? Thanks! regards, Cheong Takhoe -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED]
Missing database connectivity
Hi, Been using Tomcat 3.1 and 3.2 for about a year now and I noticed that whenever our database administrator shuts down and restarts the database (Oracle), all of my Java beans and jsp files can't redetect the database after the restart. So most of the time, I had to restart the Tomcat to redetect the database. Could anyone (especially the development team) explain the why it can't re-establish the database connectivity to the database and is there a way to resolve this? regards, Cheong Takhoe -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED]
Re: Known Memory clean-up issues?
Hi Matt, Would like to know what did you do to tune it because it might be something that we have left out. I've tried adjusting the heap sizes... regards, Cheong Takhoe Matt Egyhazy wrote: have you tuned the jvm settings? i had out of memory errors with 3.2.3 version of tomcat after periods of heavy load until i tuned the jvm. matt - Original Message - From: Randy Layman [EMAIL PROTECTED] To: Tomcat Users List [EMAIL PROTECTED] Sent: Thursday, November 29, 2001 3:25 PM Subject: RE: Known Memory clean-up issues? The best thing you can do is to find out where YOU are leaking memory. Tools like OptimizeIt are very useful for this type of issue. Here are a few hints that might help you: * Sessions stick around for some time after the user leaves. If you have large amounts of data in the session, you might want to make your timeout smaller * Servlet instances stay around for very long amounts of time. Storing anything in static and/or instance variables of the servlet can consume memory for very long amounts of time * Static fields stay around for very long amounts of time, even if there are no more references to the classes Another tip, if you reduce the Heap size of your JVM then you can get the problem to happen quicker (since there's less memory available to leak). From the JavaDoc on java.lang.OutOfMemoryError: Thrown when the Java Virtual Machine cannot allocate an object because it is out of memory, and no more memory could be made available by the garbage collector. Something is holding onto lots of memory. If your servlet is holding memory and a request comes it, its possible that the servlet is holding enough memory that Tomcat can't get the memory that it needs to service the request. Randy -Original Message- From: Denis Balazuc [mailto:[EMAIL PROTECTED]] Sent: Thursday, November 29, 2001 3:42 PM To: Tomcat Users List Subject: Re: Known Memory clean-up issues? Hi all Where would you recommend to use System.gc() in the context of JSP pages ? I guess it would be useless to intercept every single request and hint the system for garbage collection on each request ? (Now I quote) Also, before an OutOfMemory is thrown, the Garbage collector is guarenteed to run, meaning that you really are using all of your memory. I would look at what you are doing in your code - I have servlets that run for weeks without eating up any significant portion of memory I do have many times OutOfMemory exceptions thrown, although we're not doing *that* much It happens quite randomly so it's very difficult to isolate the problem. Moreover, it even happens when fetching HTML pages from Tomcat, without using much JSP... I'd like to find a place to catch that error to take action (like restarting Tomcat) but the only way we have found is to monitor the server and automatically restart it when it fails to respond. Any guidance to solve the problem would be appreciated ;-) Thanks Denis Balazuc - Original Message - From: Yoav Shapira [EMAIL PROTECTED] To: Tomcat Users List [EMAIL PROTECTED] Sent: Thursday, November 29, 2001 03:07 PM Subject: Re: Known Memory clean-up issues? Howdy, Any harm in forcing garbage collection to run? You cannot force garbage collection to run, only suggest it to the JVM via methods like System.gc(). If you're having difficulty tracking down memory usage, try a profiler like OptimizeIt that has entire memory trees. In addition, you can use parameters like hprof and verbosegc on the java command line to assist you in monitoring garbage collection. Yoav Shapira -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED] -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED]
Tomcat up-time
Hi folks, Would like to know how long is the uptime for your Tomcat servers and what is the configuration and operating system of your machine (memory and speedwise) coz I'm getting pretty frequent insuffient memory errors in a couple of days time. Please help. regards, Cheong Takhoe -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED]
RE: Tomcat 3.3 and Poolman 2.0.4
Yeah... Seems to be running quite smoothly and it really speeds things up. But I've got problem running it with Jive. Somehow, it conflicts with Jive's own Poolman. I get cases whereby Jive could not detect the database. regards, Cheong Takhoe -Original Message- From: KL OOI [SMTP:[EMAIL PROTECTED]] Sent: Tuesday, November 20, 2001 2:41 PM To: TOMCAT-USER Subject: Tomcat 3.3 and Poolman 2.0.4 Hi all, Do anyone successfully install Tomcat 3.3 with Poolman 2.0.4 in W2K ?? Thanks. Regards, KL OOI -- To unsubscribe: mailto:[EMAIL PROTECTED] For additional commands: mailto:[EMAIL PROTECTED] Troubles with the list: mailto:[EMAIL PROTECTED]
Worm Attacks
Hi folks, I've got a Tomcat 3.2 running on JDK 1.2.2 on Windows NT 4.0 with SP 5. As we all know, worms like Code Red and Nimba are running rampant around networks... probing for holes in IIS. When I run Tomcat at console mode, I could see the attacks and probes made by infected servers. Although the server is not infected, the Java on my Tomcat would in the end crash and a dialog box would pop up stating Application log is full. Anybody experiencing such a scenario out and knows how to deal with this? Got to keep the server running. Please help. regards, Cheong Takhoe
Benchmarking tools
Hi, Would like to know whether there are any tools out there we could use to benchmark the performance of Tomcat and the applications that we host in Tomcat? Thanks. regards, Cheong Takhoe
Tomcat FAQ/Article
Hi, I would like to propose an update, patch-up and configuration FAQ/Article for beginners who have installed Tomcat. It would be great to know what needs to be done after the server has been installed to ensure that it run optimumly. Or has such a document been made available already? I'm not sure...but please do enlighten me. regards, Cheong Takhoe
Tomcat Performance
Hi, I'm encountering performance issues with regards to Tomcat. I have two servers running. One with Tomcat 3.1 and one with Tomcat 3.2, both on Window NT 4.0 . After running for a certain time, its gets slower and in the end, the web-applications can run anymore. I would like to know if any of you encountered such problem and how you worked to solve it. Urgent. Please help. regards, Cheong Takhoe
Concurrent Users - How to see it
Hi, As we need to know how many concurrent users we have on our Tomcat, I would like to know how and what tools do you folks out there use to determine the number of concurrently connect users at the moment? Thanks regards, Cheong Takhoe
