Re: about getRemoteHost()
Actually, there are many cases where the router changes the FROM address -- Network Address Translation (NAT) does just this. Those home ADSL networks with many computers often do this kind of translation (it's reversed when the packet comes back). It's also not uncommon for remote offices to have this kind of translation as well. It's best these days to assume that the IP address you see has nothing to do with the user when dealing with the public Internet. Proxy Servers, NAT and any number of other things mess with this. Clayton -Original Message- From: A mailing list about Java Server Pages specification and reference [mailto:JSP-INTEREST;JAVA.SUN.COM] On Behalf Of John Ghidiu Sent: 17 October 2002 19:19 To: [EMAIL PROTECTED] Subject: Re: about getRemoteHost() In fact, if the router does change the FROM field, the TCP/IP connection is effectively terminated because the receiving end can no longer reply (even with an ACK) that the packet was received. However, a proxy is allowed to (and often does) change the packet. Be aware of that in your programming (which means, among other things, no session tracking via IP address). John -Original Message- From: Peter Dolukhanov [mailto:peter.dolukhanov;NCL.AC.UK] Sent: Wednesday, October 16, 2002 10:17 AM To: [EMAIL PROTECTED] Subject: Re: [JSP-INTEREST] about getRemoteHost() From my knowledge of networking, a router (or routers) will not change the From field of an IP packet, they just forward the packet onto a node closer to it's destination. As even this e-mail bounces through umpteen routers, and none of these will modify the remote address. So, as far I can tell this won't happen - what you have to worry about is Web Proxies as these do send the request to the web server themselves, and your web server will see them as the remote host and not you. Regards, Peter Dolukhanov -Original Message- From: A mailing list about Java Server Pages specification and reference [mailto:JSP-INTEREST;JAVA.SUN.COM] On Behalf Of randie ursal Sent: 16 October 2002 03:07 To: [EMAIL PROTECTED] Subject: about getRemoteHost() hi, i want some idea on this. i have a setup where my WebServer is separated by a Router from a User. when the user access the webserver it has to pass through the router, so my question is what would be return by the method getRemoteHost()? is it the IP address of the Router or the User Workstation? thanks a lot. randie === To unsubscribe: mailto [EMAIL PROTECTED] with body: signoff JSP-INTEREST. For digest: mailto [EMAIL PROTECTED] with body: set JSP-INTEREST DIGEST. Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com === To unsubscribe: mailto [EMAIL PROTECTED] with body: signoff JSP-INTEREST. For digest: mailto [EMAIL PROTECTED] with body: set JSP-INTEREST DIGEST. Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com = To unsubscribe: mailto [EMAIL PROTECTED] with body: signoff JSP-INTEREST. For digest: mailto [EMAIL PROTECTED] with body: set JSP-INTEREST DIGEST. Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com ==To unsubscribe: mailto [EMAIL PROTECTED] with body: signoff JSP-INTEREST. For digest: mailto [EMAIL PROTECTED] with body: set JSP-INTEREST DIGEST. Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com
Re: obtaining date and time in suitable format for MySQL
No way Hugo !!! You should use the java.util.GregorianCalendar class , as follows: code Calendar calendar = new GregorianCalendar(); Date trialTime = new Date(); calendar.setTime(trialTime); System.out.println(YEAR: +calendar.get(Calendar.YEAR)); here your code... /code For any reference, please consult http://java.sun.com/j2se/1.3/docs/api/java/util/GregorianCalendar.html and you will find all the methods() that you need. Regards, Ionel Condor. - Original Message - From: hugo [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Friday, October 18, 2002 6:23 AM Subject: obtaining date and time in suitable format for MySQL Hi I am javing a jsp file where I would like to get the current date and time to be inserted in fields of an SQL table. The date should go into the MySQL date field and hence should be of format -mm-dd. I tried to use java.sql.Date, but I couldn't get it to work. If I simply use long date = 0; java.sql.Date sqlDate = new java.sql.Date(date); int year = sqlDate.getYear(); I get back 70. So obviously I have to get the year from the machine's time, which is a linux box with Redhat 7.3. So I tried this: long date = 0; java.sql.Date sqlDate = new java.sql.Date(date); String thetime = sqlDate(System.currentTimeinMillis()); out.println (SQL time is + thetime); But this didn't work either. How do you do this? In addition, I would like to get the time, but in decimal format i.e. rather than 11:15 I would like to get 11.25 Is there a way of doing this? Any help will be greatly appreciated. Thanks Hugo -- Dr Hugo Bouckaert Systems and Programming Engineer GeoInformatics Exploration Australia P/L 57 Havelock St West Perth, WA 6005 PO Box 1675, West Perth 6872 Ph: 61 08 9420 7400 Fax: 61 08 9226 1299 www.geoinformex.com This email and any attachments may be confidential or legally privileged. If you received this message in error or are not the intended recipient, you should destroy the e-mail message and any attachments or copies, and you are prohibited from retaining, distributing, disclosing or using any information contained herein. Please inform us of the erroneous delivery by return e-mail. Thank you for your cooperation. === To unsubscribe: mailto [EMAIL PROTECTED] with body: signoff JSP-INTEREST. For digest: mailto [EMAIL PROTECTED] with body: set JSP-INTEREST DIGEST. Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com === To unsubscribe: mailto [EMAIL PROTECTED] with body: signoff JSP-INTEREST. For digest: mailto [EMAIL PROTECTED] with body: set JSP-INTEREST DIGEST. Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com
Re: obtaining date and time in suitable format for MySQL
Try this %@ page language=java import=java.sql.*, java.io.*, java.util.*, javax.servlet.http.*% %@ page import=java.util.Date,java.util.Locale,java.text.*% % Date today; String dd=,yy=,mm=,td=; today=new Date(); Locale cl=new Locale(en,US); SimpleDateFormat sf=new SimpleDateFormat(dd.MM.,cl); td=sf.format(today); dd=td.substring(0,2); mm=td.substring(3,5); yy=td.substring(6); % V.T.R.Ravi Kumar Engineer,CCX,BHEL, Haridwar Phone : Office-91-0133-485260 Res -91-0133-426121 - - Original Message - From: hugo [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Friday, October 18, 2002 9:53 AM Subject: obtaining date and time in suitable format for MySQL Hi I am javing a jsp file where I would like to get the current date and time to be inserted in fields of an SQL table. The date should go into the MySQL date field and hence should be of format -mm-dd. I tried to use java.sql.Date, but I couldn't get it to work. If I simply use long date = 0; java.sql.Date sqlDate = new java.sql.Date(date); int year = sqlDate.getYear(); I get back 70. So obviously I have to get the year from the machine's time, which is a linux box with Redhat 7.3. So I tried this: long date = 0; java.sql.Date sqlDate = new java.sql.Date(date); String thetime = sqlDate(System.currentTimeinMillis()); out.println (SQL time is + thetime); But this didn't work either. How do you do this? In addition, I would like to get the time, but in decimal format i.e. rather than 11:15 I would like to get 11.25 Is there a way of doing this? Any help will be greatly appreciated. Thanks Hugo -- Dr Hugo Bouckaert Systems and Programming Engineer GeoInformatics Exploration Australia P/L 57 Havelock St West Perth, WA 6005 PO Box 1675, West Perth 6872 Ph: 61 08 9420 7400 Fax: 61 08 9226 1299 www.geoinformex.com This email and any attachments may be confidential or legally privileged. If you received this message in error or are not the intended recipient, you should destroy the e-mail message and any attachments or copies, and you are prohibited from retaining, distributing, disclosing or using any information contained herein. Please inform us of the erroneous delivery by return e-mail. Thank you for your cooperation. === To unsubscribe: mailto [EMAIL PROTECTED] with body: signoff JSP-INTEREST. For digest: mailto [EMAIL PROTECTED] with body: set JSP-INTEREST DIGEST. Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com === To unsubscribe: mailto [EMAIL PROTECTED] with body: signoff JSP-INTEREST. For digest: mailto [EMAIL PROTECTED] with body: set JSP-INTEREST DIGEST. Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com
Re: obtaining date and time in suitable format for MySQL
Dont format the date by hand!!! Use a PreparedStatement to write to the database, it handles the formatting for you. e.g.: long curTime = new java.util.Date().getTime(); Connection connection= ... ; PreparedStatement pstmt = connection.prepareStatement( update bla set time = ?); pstmt.setDate( 1 ,new java.sql.Date( curTime )); //... I am javing a jsp file where I would like to get the current date and time to be inserted in fields of an SQL table. The date should go into the MySQL date field and hence should be of format -mm-dd. I tried to use java.sql.Date, but I couldn't get it to work. If I simply use long date = 0; java.sql.Date sqlDate = new java.sql.Date(date); int year = sqlDate.getYear(); I get back 70. So obviously I have to get the year from the machine's time, which is a linux box with Redhat 7.3. So I tried this: long date = 0; java.sql.Date sqlDate = new java.sql.Date(date); String thetime = sqlDate(System.currentTimeinMillis()); out.println (SQL time is + thetime); But this didn't work either. How do you do this? In addition, I would like to get the time, but in decimal format i.e. rather than 11:15 I would like to get 11.25 Is there a way of doing this? Any help will be greatly appreciated. Thanks Hugo ==To unsubscribe: mailto [EMAIL PROTECTED] with body: signoff JSP-INTEREST. For digest: mailto [EMAIL PROTECTED] with body: set JSP-INTEREST DIGEST. Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com
User log from JSP
I want to track each page a user goes to in a database from my JSP web app. What I use to do is at the top of every page I would capture the user and page information and do an insert into the database. But it seems that doing an insert into the database on every page load might be a little inefficient. Does anyone have an idea on how to capture these stats? thank you! ~ Troy Campano ==To unsubscribe: mailto [EMAIL PROTECTED] with body: signoff JSP-INTEREST. For digest: mailto [EMAIL PROTECTED] with body: set JSP-INTEREST DIGEST. Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com
Re: User log from JSP
If you dont want to do a search, you could just log the info ( call ServletContext.log() ). If not, you could collect the info in a context attribute, and periodically submit all the requests ( like once in 4 hours ) together to a database. -- padhu Campano, Troy wrote: I want to track each page a user goes to in a database from my JSP web app. What I use to do is at the top of every page I would capture the user and page information and do an insert into the database. But it seems that doing an insert into the database on every page load might be a little inefficient. Does anyone have an idea on how to capture these stats? thank you! ~ Troy Campano = To unsubscribe: mailto [EMAIL PROTECTED] with body: signoff JSP-INTEREST. For digest: mailto [EMAIL PROTECTED] with body: set JSP-INTEREST DIGEST. Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com === To unsubscribe: mailto [EMAIL PROTECTED] with body: signoff JSP-INTEREST. For digest: mailto [EMAIL PROTECTED] with body: set JSP-INTEREST DIGEST. Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com
Re: UTF8 conversion - send mails from database : failUTF8Conv
Actually I think it's Japanese, try this site Looks like good info: http://tech.ymirlink.co.jp/perl/cpan/Unicode-Japanese-0.03/Japanese.html Let me know how it turns out. sounds interesting. Keith E. Kosmicki Applications Consultant State of IL Human Services STL Technology Partners [EMAIL PROTECTED] 10/18/02 08:45AM Hi All, We have an application which checks an oracle database and a servlet sends out the mails at regular intervals based on the status whether the message was sent or not. The application has been running fine until now for abt 10 months. But today morning we noticed that all mailing services had stopped. When we investigated further we found that there was one message which was holding the entire queue and none of the mails posted after that were being sent. On checking the logs we found this error. Fail to convert between UTF8 and UCS2: failUTF8Conv Apparently it talks abt chracter set conversion in the database. The message that was blocking was in some other language other than english, possibly french. And we use Oracle 8 thin drivers to connect to the database and the jdk version is jdk1.2.2. Has somebody faced the same problem and is there any solution to this.. I did check each of the sites Google fished out to me.. but they only talk more about the problem rather than the solution to the problem. Please help me with this problem.. Here is the content of the log file.. java.sql.SQLException: Fail to convert between UTF8 and UCS2: failUTF8Conv at java.lang.Throwable.fillInStackTrace(Native Method) at java.lang.Throwable.fillInStackTrace(Compiled Code) at java.lang.Throwable.init(Compiled Code) at java.lang.Exception.init(Compiled Code) at java.sql.SQLException.init(SQLException.java:43) at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:114) at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:156) at oracle.jdbc.dbaccess.DBError.check_error(DBError.java:775) at oracle.jdbc.dbaccess.DBConversion.failUTF8Conv(DBConversion.java:1746) at oracle.jdbc.dbaccess.DBConversion.utf8BytesToJavaChars(Compiled Code) at oracle.jdbc.dbaccess.DBConversion.utf8BytesToString(Compiled Code) at oracle.jdbc.dbaccess.DBConversion.CharBytesToString(Compiled Code) at oracle.jdbc.driver.OracleStatement.getStringValue(Compiled Code) at oracle.jdbc.driver.OracleStatement.getObjectValue(Compiled Code) at oracle.jdbc.driver.OracleStatement.getObjectValue(Compiled Code) at oracle.jdbc.driver.OracleResultSetImpl.getObject(Compiled Code) at sun.jdbc.rowset.CachedRowSet.populate(Compiled Code) at com.sapient.core.sql.SQLCachedRowSet.populate(Compiled Code) at com.sapient.core.sql.SQLWrapper.executeQueryStoredProc(Compiled Code) at com.sapient.core.sql.SQLWrapper.executeQueryStoredProc(Compiled Code) at com.edward.mailwrapper.MailUtil.getUnsentMailsParameters(Compiled Code) at com.edward.mailwrapper.MailService.performScheduledTask(Compiled Code) at atg.service.scheduler.ScheduledJob.runJobs(Compiled Code) at atg.service.scheduler.Scheduler$2$handler.run(Scheduler.java:694) MessageFail to convert between UTF8 and UCS2: failUTF8Conv SQLCode17037 SQLState null --Thu Oct 17 18:42:24 GMT+01:00 2002--mailWrapper-- com.edward.mailwrapper--MailService--performScheduledTask--Mail Wrapper--1--com.sapient.core.sql.GeneralSQLException ERRORID608 PACKAGEcom.sapient.core.sqlMODULE CORECLASS SQLCachedRowSet FUNC TION populate(ResultSet rset) throws GeneralSQLException ERRORTEXT: Exception occured using SQLCachedRowSet. EXTRAMESSAGE: Unable to populate the CachedRowSet from the ResultSetINCOMING: java.sql.SQLException: Fail to convert between UTF8 and UCS2: failUTF8Conv === To unsubscribe: mailto [EMAIL PROTECTED] with body: signoff JSP-INTEREST. For digest: mailto [EMAIL PROTECTED] with body: set JSP-INTEREST DIGEST. Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com ==To unsubscribe: mailto [EMAIL PROTECTED] with body: signoff JSP-INTEREST. For digest: mailto [EMAIL PROTECTED] with body: set JSP-INTEREST DIGEST. Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com
Re: Pausing execution?
See for example Delay tag in Coldtags suite: http://www.servletsuite.com/jsp.htm -- Coldbeans Software - server-side Java (tm) components http://www.servletsuite.com __ The NEW Netscape 7.0 browser is now available. Upgrade now! http://channels.netscape.com/ns/browsers/download.jsp Get your own FREE, personal Netscape Mail account today at http://webmail.netscape.com/ === To unsubscribe: mailto [EMAIL PROTECTED] with body: signoff JSP-INTEREST. For digest: mailto [EMAIL PROTECTED] with body: set JSP-INTEREST DIGEST. Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com
Database Access Using Tags
Hi, I seem to recall reading on one of the user lists (maybe this one) that using taglibs for connecting to the database was not a good idea, for security reasons. The consensus was that it was at least better than embedding Java scrptlets in your JSP. I've been scouring the Net trying to figure out the best way to get a database connection. I'm using JSPs for the view, but I want to keep as much Java code out of the pages as possible, since that results in a much cleaner and easier to maintain application. But I'm a newbie when it comes to model 2. I've written a site before using just JSP with Dreamweaver UD4. But with what I'm working on now, that is not good enough. I've got Tomcat set up, and I'm trying to use connection pooling. I know that I can use JNDI and Tomcat to look after the connection pooling details, though I'm tearing my hair out trying to figure out how it all works and if I've got all the pieces in place that I need. My question/plea for input here is regarding what I should be using to write the actual connection in. If tags are not recommended, then should I be using a class, a bean, or a servlet to do that work? I read recently (I've been doing a LOT of reading) that tags are a replacement for beans--though that sort of conflicts with the point that I read before that tags are only one step up from using scriptlets. I'm starting to conclude that I should be using a servlet, but I would really appreciate some confirmation from people who are experienced with all this. Also, is it possible/necessary to try to make the structure of the Web application object oriented? If I'm using JSP, does that negate the need for creating an object oriented design--does it make that kind of a design, even though I'm using Java, impossible to really do? Thank you for any input. I'm trying to get all these concepts straight in my head, and the information out there is not only conflicting, but a little overwhelming. Val === To unsubscribe: mailto [EMAIL PROTECTED] with body: signoff JSP-INTEREST. For digest: mailto [EMAIL PROTECTED] with body: set JSP-INTEREST DIGEST. Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com
Re: Database Access Using Tags
If you want to avoid a typical MVC structure and having all your logic in Servlets instead of JSP files (which is what I would suggest you do), you can abstract your database accesses in classes that do all the work and only have the class method calls within our JSP code. That way you do not need to have the database implementation code visible in the JSP and you can reuse the classes in multiple JSP files. Create all the database access classes in a package and include that package in each JSP. It is not as well structured as a MVC type of structure but it does a reasonable job of isolating your database access from the JSP. If you create your classes properly you can make your JSP code independent of the database being used and thus allow it to be very portable. You can also make the classes centered around functionality as opposed to being table specific, thus granting you more freedom for future modifications. This will keep the object oriented design valid without having to use MVC. However, it is an inferior approach and should be used with caution and only in simple applications. -Original Message- From: A mailing list about Java Server Pages specification and reference [mailto:JSP-INTEREST;JAVA.SUN.COM]On Behalf Of rvt Sent: Friday, October 18, 2002 8:25 AM To: [EMAIL PROTECTED] Subject: [JSP-INTEREST] Database Access Using Tags Hi, I seem to recall reading on one of the user lists (maybe this one) that using taglibs for connecting to the database was not a good idea, for security reasons. The consensus was that it was at least better than embedding Java scrptlets in your JSP. I've been scouring the Net trying to figure out the best way to get a database connection. I'm using JSPs for the view, but I want to keep as much Java code out of the pages as possible, since that results in a much cleaner and easier to maintain application. But I'm a newbie when it comes to model 2. I've written a site before using just JSP with Dreamweaver UD4. But with what I'm working on now, that is not good enough. I've got Tomcat set up, and I'm trying to use connection pooling. I know that I can use JNDI and Tomcat to look after the connection pooling details, though I'm tearing my hair out trying to figure out how it all works and if I've got all the pieces in place that I need. My question/plea for input here is regarding what I should be using to write the actual connection in. If tags are not recommended, then should I be using a class, a bean, or a servlet to do that work? I read recently (I've been doing a LOT of reading) that tags are a replacement for beans--though that sort of conflicts with the point that I read before that tags are only one step up from using scriptlets. I'm starting to conclude that I should be using a servlet, but I would really appreciate some confirmation from people who are experienced with all this. Also, is it possible/necessary to try to make the structure of the Web application object oriented? If I'm using JSP, does that negate the need for creating an object oriented design--does it make that kind of a design, even though I'm using Java, impossible to really do? Thank you for any input. I'm trying to get all these concepts straight in my head, and the information out there is not only conflicting, but a little overwhelming. Val === To unsubscribe: mailto [EMAIL PROTECTED] with body: signoff JSP-INTEREST. For digest: mailto [EMAIL PROTECTED] with body: set JSP-INTEREST DIGEST. Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com === To unsubscribe: mailto [EMAIL PROTECTED] with body: signoff JSP-INTEREST. For digest: mailto [EMAIL PROTECTED] with body: set JSP-INTEREST DIGEST. Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com
Re: Database Access Using Tags
Val, I seem to recall reading on one of the user lists (maybe this one) that using taglibs for connecting to the database was not a good idea, for security reasons. The consensus was that it was at least better than embedding Java scrptlets in your JSP. The main reason accessing a database through tags is better than Java scriptlets is that the code is simpler and cleaner. From an architecture/design point of view, both approaches can be considered equivalent. The main reason NOT to access a database in the JSPs is separating business logic from presentation, given that you consider JSPs as presentation only technology (strange as it may seem, not everybody does!). And Model 2 is one approach to that, the most popular one, but not necessarily the best. My question/plea for input here is regarding what I should be using to write the actual connection in. If tags are not recommended, then should I be using a class, a bean, or a servlet to do that work? I read recently (I've been doing a LOT of reading) that tags are a replacement for beans--though that sort of conflicts with the point that I read before that tags are only one step up from using scriptlets. I'm starting to conclude that I should be using a servlet, but I would really appreciate some confirmation from people who are experienced with all this. First, tags are not a replacement for beans, I wonder where you read that ;) Tags are means for providing abstractions/encapsulating functionality, be it business logic or presentation related, that is accessible through an XML-based syntax in a JSP page. That's pretty much all tags are. If you want to separate presentation from the business logic, the first thing you should do is encapsulate the business logic in Java beans. Those Java beans will work with the database to access/store/update/delete data. And the JSPs will use those Java beans to get the information to display. When it comes to getting input from the end-user and storing it in the database, you will need to somehow set the bean properties from a submitted HTML form and tell the bean to write its information to the database (e.g. something like mybean.insert() or mybean.update). Again, the Java bean deals with database access and your presentation layer deals only with the Java bean. Most JSP/Servlets frameworks map submitted form fields to bean properties automatically. Struts (the most popular Model 2 framework) does that, even though it limits the types of your bean properties to primitive Java types. Our product TICL does it also. All this is pretty much standard practice... Also, is it possible/necessary to try to make the structure of the Web application object oriented? If I'm using JSP, does that negate the need for creating an object oriented design--does it make that kind of a design, even though I'm using Java, impossible to really do? It is possible and good practice to have your web application be object-oriented. However, JSPs make that very difficult, because they can't be sub-classed. By encapsulating the business logic of your application in Java beans, you have at least that be object-oriented. The presentation logic can be made object-oriented, or close to, by using one of the available UI frameworks. Cheers, Boris Borislav Iordanov Chief Architect TICL - a RAD toolkit for server-side Java http://www.kobrix.com -Original Message- From: A mailing list about Java Server Pages specification and reference [mailto:JSP-INTEREST;JAVA.SUN.COM] On Behalf Of rvt Sent: Friday, October 18, 2002 11:25 AM To: [EMAIL PROTECTED] Subject: Database Access Using Tags Hi, I've been scouring the Net trying to figure out the best way to get a database connection. I'm using JSPs for the view, but I want to keep as much Java code out of the pages as possible, since that results in a much cleaner and easier to maintain application. But I'm a newbie when it comes to model 2. I've written a site before using just JSP with Dreamweaver UD4. But with what I'm working on now, that is not good enough. I've got Tomcat set up, and I'm trying to use connection pooling. I know that I can use JNDI and Tomcat to look after the connection pooling details, though I'm tearing my hair out trying to figure out how it all works and if I've got all the pieces in place that I need. My question/plea for input here is regarding what I should be using to write the actual connection in. If tags are not recommended, then should I be using a class, a bean, or a servlet to do that work? I read recently (I've been doing a LOT of reading) that tags are a replacement for beans--though that sort of conflicts with the point that I read before that tags are only one step up from using scriptlets. I'm starting to conclude that I should be using a servlet, but I would really appreciate some confirmation from people who are experienced with all
Jar files
Hi, I'm not quite sure where to put my JAR files. I'm using Tomcat 4.0.6 and my directory structure is c:\jakarta-tomcat-4.0.6\webapps\ROOT\WEB-INF\Timeslp\Timeslip2.jsp A snippet of my code is: % Class.forName(com.jnetdirect.jsql.JSQLDriver); conn = jdbc:JSQLConnect://168.179.185.19/database=Timeslip/user=timeslip/password=timeslip; Connection Conn = DriverManager.getConnection(conn); ... Where do I put the JSQConnect.jar file so the class is recognized? My classpath is: .;C:\JSPDevelopment;C:\jakarta-tomcat-4.0.6\common\lib\servlet.jar;c:\jakarta-tomcat-4.0.6\webapps\root\web-inf\classes;c:\jakarta-tomcat-4.0.6\webapps\root\timeslip\web-inf\classes What am I doing wrong? Thanks in advance Paul === To unsubscribe: mailto [EMAIL PROTECTED] with body: signoff JSP-INTEREST. For digest: mailto [EMAIL PROTECTED] with body: set JSP-INTEREST DIGEST. Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com
Re: Database Access Using Tags
Thank you, everyone who replied. Just one clarification: Boris, did you mean EJBs when you said Java Beans? I would rather not use EJBs. I'm only using a Web container, not an application server. Also, if what you're referring to are just regular beans, would they be in a package? I know that is probably a stupid question, but I have never used beans before, and two developers I've spoken to in the past have warned me away from EJBs, so when I was planning this particular project, I was not even considering EJBs. Jim's suggestion that I package classes and access the methods from the JSPs sounded like a nice, simple, clean way to do things. His caveat was that it should be used with caution, and for simple applications. If an application were not so simple (and right now, the one I'm working on is), would Java Beans then be the better alternative, if I were able to acquire the knowledge I needed to use them? By the way, I read that Taglibs are the next evolution from Java Beans and that it is better to use them, in a posting on a user list. I belong to a number of them, and I can't say which one it was. But perhaps my paraphrasing of what was said there is inaccurate. I did, however, get an impression from reading it that Tag libraries make using beans obsolete, though that might not have been the author's intent. I guess that's how rumours get started. ;-) I do really appreciate all the knowledge that is being shared on these lists. I'd be lost without them, and it sure helps to have such misconceptions cleared up. Val - Original Message - From: Borislav Iordanov [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Friday, October 18, 2002 12:20 PM Subject: Re: Database Access Using Tags Val, I seem to recall reading on one of the user lists (maybe this one) that using taglibs for connecting to the database was not a good idea, for security reasons. The consensus was that it was at least better than embedding Java scrptlets in your JSP. The main reason accessing a database through tags is better than Java scriptlets is that the code is simpler and cleaner. From an architecture/design point of view, both approaches can be considered equivalent. The main reason NOT to access a database in the JSPs is separating business logic from presentation, given that you consider JSPs as presentation only technology (strange as it may seem, not everybody does!). And Model 2 is one approach to that, the most popular one, but not necessarily the best. My question/plea for input here is regarding what I should be using to write the actual connection in. If tags are not recommended, then should I be using a class, a bean, or a servlet to do that work? I read recently (I've been doing a LOT of reading) that tags are a replacement for beans--though that sort of conflicts with the point that I read before that tags are only one step up from using scriptlets. I'm starting to conclude that I should be using a servlet, but I would really appreciate some confirmation from people who are experienced with all this. First, tags are not a replacement for beans, I wonder where you read that ;) Tags are means for providing abstractions/encapsulating functionality, be it business logic or presentation related, that is accessible through an XML-based syntax in a JSP page. That's pretty much all tags are. If you want to separate presentation from the business logic, the first thing you should do is encapsulate the business logic in Java beans. Those Java beans will work with the database to access/store/update/delete data. And the JSPs will use those Java beans to get the information to display. When it comes to getting input from the end-user and storing it in the database, you will need to somehow set the bean properties from a submitted HTML form and tell the bean to write its information to the database (e.g. something like mybean.insert() or mybean.update). Again, the Java bean deals with database access and your presentation layer deals only with the Java bean. Most JSP/Servlets frameworks map submitted form fields to bean properties automatically. Struts (the most popular Model 2 framework) does that, even though it limits the types of your bean properties to primitive Java types. Our product TICL does it also. All this is pretty much standard practice... Also, is it possible/necessary to try to make the structure of the Web application object oriented? If I'm using JSP, does that negate the need for creating an object oriented design--does it make that kind of a design, even though I'm using Java, impossible to really do? It is possible and good practice to have your web application be object-oriented. However, JSPs make that very difficult, because they can't be sub-classed. By encapsulating the business logic of your application in Java beans, you have at least that be object-oriented. The presentation logic can be made object-oriented, or close to, by ᚠsng one of
Re: Database Access Using Tags
Val, I meant regular beans, not EJBs. Java beans are Java classes that adhere to certain naming conventions. But you'll have to do your homework on that;) Jim's comments and mine about a Java beans layer on top of the database said essentially the same thing, but in a different way. Cheers, Boris Borislav Iordanov Chief Architect TICL - a RAD toolkit for server-side Java http://www.kobrix.com -Original Message- From: A mailing list about Java Server Pages specification and reference [mailto:JSP-INTEREST;JAVA.SUN.COM] On Behalf Of rvt Sent: Friday, October 18, 2002 2:29 PM To: [EMAIL PROTECTED] Subject: Re: Database Access Using Tags Thank you, everyone who replied. Just one clarification: Boris, did you mean EJBs when you said Java Beans? I would rather not use EJBs. I'm only using a Web container, not an application server. Also, if what you're referring to are just regular beans, would they be in a package? I know that is probably a stupid question, but I have never used beans before, and two developers I've spoken to in the past have warned me away from EJBs, so when I was planning this particular project, I was not even considering EJBs. Jim's suggestion that I package classes and access the methods from the JSPs sounded like a nice, simple, clean way to do things. His caveat was that it should be used with caution, and for simple applications. If an application were not so simple (and right now, the one I'm working on is), would Java Beans then be the better alternative, if I were able to acquire the knowledge I needed to use them? By the way, I read that Taglibs are the next evolution from Java Beans and that it is better to use them, in a posting on a user list. I belong to a number of them, and I can't say which one it was. But perhaps my paraphrasing of what was said there is inaccurate. I did, however, get an impression from reading it that Tag libraries make using beans obsolete, though that might not have been the author's intent. I guess that's how rumours get started. ;-) I do really appreciate all the knowledge that is being shared on these lists. I'd be lost without them, and it sure helps to have such misconceptions cleared up. Val - Original Message - From: Borislav Iordanov [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Friday, October 18, 2002 12:20 PM Subject: Re: Database Access Using Tags Val, I seem to recall reading on one of the user lists (maybe this one) that using taglibs for connecting to the database was not a good idea, for security reasons. The consensus was that it was at least better than embedding Java scrptlets in your JSP. The main reason accessing a database through tags is better than Java scriptlets is that the code is simpler and cleaner. From an architecture/design point of view, both approaches can be considered equivalent. The main reason NOT to access a database in the JSPs is separating business logic from presentation, given that you consider JSPs as presentation only technology (strange as it may seem, not everybody does!). And Model 2 is one approach to that, the most popular one, but not necessarily the best. My question/plea for input here is regarding what I should be using to write the actual connection in. If tags are not recommended, then should I be using a class, a bean, or a servlet to do that work? I read recently (I've been doing a LOT of reading) that tags are a replacement for beans--though that sort of conflicts with the point that I read before that tags are only one step up from using scriptlets. I'm starting to conclude that I should be using a servlet, but I would really appreciate some confirmation from people who are experienced with all this. First, tags are not a replacement for beans, I wonder where you read that ;) Tags are means for providing abstractions/encapsulating functionality, be it business logic or presentation related, that is accessible through an XML-based syntax in a JSP page. That's pretty much all tags are. If you want to separate presentation from the business logic, the first thing you should do is encapsulate the business logic in Java beans. Those Java beans will work with the database to access/store/update/delete data. And the JSPs will use those Java beans to get the information to display. When it comes to getting input from the end-user and storing it in the database, you will need to somehow set the bean properties from a submitted HTML form and tell the bean to write its information to the database (e.g. something like mybean.insert() or mybean.update). Again, the Java bean deals with database access and your presentation layer deals only with the Java bean. Most JSP/Servlets frameworks map submitted form fields to bean properties automatically. Struts (the most popular Model 2
Re: Question on documentation...
Man, you must be kidding. So the tutorial I just wrote and emailed to my 32 students will not work without the web.xml changes? Are you sure? Please reply. Thanks, Luis. - Original Message - From: Hans Bergsten [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Thursday, October 17, 2002 2:58 PM Subject: Re: Question on documentation... Paul Toyn wrote: The following is a snippet from the Jakarta-Tomcat configuration and testing documentation: Once you compile HelloServlet.java, put HelloServlet.class in install_dir/webapps/ROOT/WEB-INF/classes. After compiling the code, access the servlet with the URL http://localhost/servlet/HelloServlet ... You should get a simple HTML page that says Hello. If this URL fails but the test of the server itself succeeded, you probably put the class file in the wrong directory. I've followed the example and everything is working up to the point above. I compiled the java code and it compiled without a hitch, but I do get a 404 error when I try the URL. The test of the server did succeed. I placed the class file into the folder as indicated. Is the documentation correct? Where does the folder servlet get involved? What am I doing wrong? Is this with Tomcat 4.1.12? If so, it's because the invoker (the servlet mapped to the /servlet/* path) is disabled by default starting with this version due to security concerns. See the release notes for details. In general, you should use explicit mappings for all servlets instead of using the invoker. Add this to the web.xml file for the application (e.g. webapps/ROOT/WEB-INF/web.xml for the Tomcat default application): servlet servlet-namehello/servlet-name servlet-classHelloServlet/servlet-class /servlet ... servlet-mapping servlet-namehello/servlet-name url-pattern/hello/*/url-pattern /servlet-mapping After restarting the web container (Tomcat), you can use a URL like this to invoke it: http://localhost:8080/hello Hans -- Hans Bergsten [EMAIL PROTECTED] Gefion Software http://www.gefionsoftware.com JavaServer Pageshttp://TheJSPBook.com === To unsubscribe: mailto [EMAIL PROTECTED] with body: signoff JSP-INTEREST. For digest: mailto [EMAIL PROTECTED] with body: set JSP-INTEREST DIGEST. Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com === To unsubscribe: mailto [EMAIL PROTECTED] with body: signoff JSP-INTEREST. For digest: mailto [EMAIL PROTECTED] with body: set JSP-INTEREST DIGEST. Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com
UTF8 conversion - send mails from database : failUTF8Conv
Hi All, We have an application which checks an oracle database and a servlet sends out the mails at regular intervals based on the status whether the message was sent or not. The application has been running fine until now for abt 10 months. But today morning we noticed that all mailing services had stopped. When we investigated further we found that there was one message which was holding the entire queue and none of the mails posted after that were being sent. On checking the logs we found this error. Fail to convert between UTF8 and UCS2: failUTF8Conv Apparently it talks abt chracter set conversion in the database. The message that was blocking was in some other language other than english, possibly french. And we use Oracle 8 thin drivers to connect to the database and the jdk version is jdk1.2.2. Has somebody faced the same problem and is there any solution to this.. I did check each of the sites Google fished out to me.. but they only talk more about the problem rather than the solution to the problem. Please help me with this problem.. Here is the content of the log file.. java.sql.SQLException: Fail to convert between UTF8 and UCS2: failUTF8Conv at java.lang.Throwable.fillInStackTrace(Native Method) at java.lang.Throwable.fillInStackTrace(Compiled Code) at java.lang.Throwable.init(Compiled Code) at java.lang.Exception.init(Compiled Code) at java.sql.SQLException.init(SQLException.java:43) at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:114) at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:156) at oracle.jdbc.dbaccess.DBError.check_error(DBError.java:775) at oracle.jdbc.dbaccess.DBConversion.failUTF8Conv(DBConversion.java:1746) at oracle.jdbc.dbaccess.DBConversion.utf8BytesToJavaChars(Compiled Code) at oracle.jdbc.dbaccess.DBConversion.utf8BytesToString(Compiled Code) at oracle.jdbc.dbaccess.DBConversion.CharBytesToString(Compiled Code) at oracle.jdbc.driver.OracleStatement.getStringValue(Compiled Code) at oracle.jdbc.driver.OracleStatement.getObjectValue(Compiled Code) at oracle.jdbc.driver.OracleStatement.getObjectValue(Compiled Code) at oracle.jdbc.driver.OracleResultSetImpl.getObject(Compiled Code) at sun.jdbc.rowset.CachedRowSet.populate(Compiled Code) at com.sapient.core.sql.SQLCachedRowSet.populate(Compiled Code) at com.sapient.core.sql.SQLWrapper.executeQueryStoredProc(Compiled Code) at com.sapient.core.sql.SQLWrapper.executeQueryStoredProc(Compiled Code) at com.edward.mailwrapper.MailUtil.getUnsentMailsParameters(Compiled Code) at com.edward.mailwrapper.MailService.performScheduledTask(Compiled Code) at atg.service.scheduler.ScheduledJob.runJobs(Compiled Code) at atg.service.scheduler.Scheduler$2$handler.run(Scheduler.java:694) MessageFail to convert between UTF8 and UCS2: failUTF8Conv SQLCode17037 SQLState null --Thu Oct 17 18:42:24 GMT+01:00 2002--mailWrapper-- com.edward.mailwrapper--MailService--performScheduledTask--Mail Wrapper--1--com.sapient.core.sql.GeneralSQLException ERRORID608 PACKAGEcom.sapient.core.sqlMODULE CORECLASS SQLCachedRowSet FUNC TION populate(ResultSet rset) throws GeneralSQLException ERRORTEXT: Exception occured using SQLCachedRowSet. EXTRAMESSAGE: Unable to populate the CachedRowSet from the ResultSetINCOMING: java.sql.SQLException: Fail to convert between UTF8 and UCS2: failUTF8Conv === To unsubscribe: mailto [EMAIL PROTECTED] with body: signoff JSP-INTEREST. For digest: mailto [EMAIL PROTECTED] with body: set JSP-INTEREST DIGEST. Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com
