Re: MultiThreading issues with Wicket.
Wicket sometimes makes things easier for us that we forget what's under the hood :) Remember that most of your implementation is already thread safe and synced on the Page. Read more about the request cycle in the free guide at: http://wicket.apache.org/guide/guide/chapter8.html So you want to perform a long running operation in a separate thread? Try this post: http://javathoughts.capesugarbird.com/2008/04/spawning-thread-for-lengthy-operation.html Have a great day, Paul Bors > On Dec 30, 2013, at 6:32 PM, eaglei22 wrote: > > Hello, I am having an issue when using a worker thread to process a csv file. > I have asked the same question here: > > http://stackoverflow.com/questions/20747605/requestcycle-goes-null-when-using-a-separate-thread > > and I wanted to post here as I feel there are not many Wicket programmers > there. > > > The main issue seems to be when I process a large csv file I get a read > error. But if I process a smaller one I do not. Here is the stack trace: > > java.io.IOException: Read error > at java.io.FileInputStream.readBytes(Native Method) > at java.io.FileInputStream.read(FileInputStream.java:220) > at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:264) > at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:306) > at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:158) > at java.io.InputStreamReader.read(InputStreamReader.java:167) > at java.io.BufferedReader.read1(BufferedReader.java:185) > at java.io.BufferedReader.read(BufferedReader.java:261) > at java.io.BufferedReader.fill(BufferedReader.java:136) > >Dec 30 13:14:31 ERROR BulkLoadPage-java.io.IOException: Read error > at java.io.BufferedReader.readLine(BufferedReader.java:299) > at java.io.BufferedReader.readLine(BufferedReader.java:362) > at au.com.bytecode.opencsv.CSVReader.getNextLine(CSVReader.java:266) > at au.com.bytecode.opencsv.CSVReader.readNext(CSVReader.java:233) > at com..wicket.BulkLoadPage.processLine(BulkLoadPage.java:547) > at com..wicket.BulkLoadPage.access$0(BulkLoadPage.java:532) > at > > > com..wicket.BulkLoadPage$BatchLoaderProcessingThread.run(BulkLoadPage.java:1294) > at java.lang.Thread.run(Thread.java:662) > > > > I basically have a listView that is being updated by the main thread using > AjaxSelfUpdatingTimer - set to update every 1 second. The worker thread > which is an inner runnable class uses the methods of the main class, and > updates the arrayList which is also stored in the main class and used by the > listView. > > I was originally getting a requestCycle error, which seemed to be resolved > by commenting out my feedbackPanel error message inside my catch. That error > seemed to be produced from a read error produced by the reference to the > CSVReader. The file being read in contains many lines. I believe around 15k. > Every line has the same data which I copied and pasted just to test a large > file. The file seems to work fine when it is less than 2k.. so I am thinking > maybe it is a sychronization issue or some issue with data interleaving. > > I had designed this page not knowing there would be issues with larger files > using a thread.. there is a lot of functionality and there is no issues with > a small file as stated.. just larger ones. The only job of the thread is to > call a method from the main thread. That method loops through and processes > the CSV file, and when that ends.. the thread dies. Should I be using local > variables in the thread? Or what are some steps I can take to > troubleshooting this error? Or is there a better way I should approach this > to having a worker thread process results while the main thread uses a > listView to display results. A dataView was reccommended and I will try that > as well, but I am not sure if I can use a worker thread with that or not. > > Thank you. > > > > -- > View this message in context: > http://apache-wicket.1842946.n4.nabble.com/MultiThreading-issues-with-Wicket-tp4663325.html > Sent from the Users forum mailing list archive at Nabble.com. > > - > To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org > For additional commands, e-mail: users-h...@wicket.apache.org > - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
Re: Migrating from 1.4.21 to 6
Hi, I would migrate first to 1.5.10 and then to 6.12. In case of issues I'd check the migration guides, then the mailing list archives and finally ask a new question here. Good luck! On Dec 30, 2013 6:46 PM, "Wayne W" wrote: > Hi All, > > I'm wanting to upgrade to the latest version of wicket but am worried about > the possible impact. Also I'm wanting to know the best migration plan. Do > you think it would be best to jump straight to 6 or first upgrade to 5? > > Any tips or ideas would be much appreciated. > > thanks >
Re: Please remove the spam post from the wicket forum
Yes to would be nice to get rid of all those spam on Nabble! -- View this message in context: http://apache-wicket.1842946.n4.nabble.com/Please-remove-the-spam-post-from-the-wicket-forum-tp4662979p4663326.html Sent from the Users forum mailing list archive at Nabble.com. - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
MultiThreading issues with Wicket.
Hello, I am having an issue when using a worker thread to process a csv file. I have asked the same question here: http://stackoverflow.com/questions/20747605/requestcycle-goes-null-when-using-a-separate-thread and I wanted to post here as I feel there are not many Wicket programmers there. The main issue seems to be when I process a large csv file I get a read error. But if I process a smaller one I do not. Here is the stack trace: java.io.IOException: Read error at java.io.FileInputStream.readBytes(Native Method) at java.io.FileInputStream.read(FileInputStream.java:220) at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:264) at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:306) at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:158) at java.io.InputStreamReader.read(InputStreamReader.java:167) at java.io.BufferedReader.read1(BufferedReader.java:185) at java.io.BufferedReader.read(BufferedReader.java:261) at java.io.BufferedReader.fill(BufferedReader.java:136) Dec 30 13:14:31 ERROR BulkLoadPage-java.io.IOException: Read error at java.io.BufferedReader.readLine(BufferedReader.java:299) at java.io.BufferedReader.readLine(BufferedReader.java:362) at au.com.bytecode.opencsv.CSVReader.getNextLine(CSVReader.java:266) at au.com.bytecode.opencsv.CSVReader.readNext(CSVReader.java:233) at com..wicket.BulkLoadPage.processLine(BulkLoadPage.java:547) at com..wicket.BulkLoadPage.access$0(BulkLoadPage.java:532) at com..wicket.BulkLoadPage$BatchLoaderProcessingThread.run(BulkLoadPage.java:1294) at java.lang.Thread.run(Thread.java:662) I basically have a listView that is being updated by the main thread using AjaxSelfUpdatingTimer - set to update every 1 second. The worker thread which is an inner runnable class uses the methods of the main class, and updates the arrayList which is also stored in the main class and used by the listView. I was originally getting a requestCycle error, which seemed to be resolved by commenting out my feedbackPanel error message inside my catch. That error seemed to be produced from a read error produced by the reference to the CSVReader. The file being read in contains many lines. I believe around 15k. Every line has the same data which I copied and pasted just to test a large file. The file seems to work fine when it is less than 2k.. so I am thinking maybe it is a sychronization issue or some issue with data interleaving. I had designed this page not knowing there would be issues with larger files using a thread.. there is a lot of functionality and there is no issues with a small file as stated.. just larger ones. The only job of the thread is to call a method from the main thread. That method loops through and processes the CSV file, and when that ends.. the thread dies. Should I be using local variables in the thread? Or what are some steps I can take to troubleshooting this error? Or is there a better way I should approach this to having a worker thread process results while the main thread uses a listView to display results. A dataView was reccommended and I will try that as well, but I am not sure if I can use a worker thread with that or not. Thank you. -- View this message in context: http://apache-wicket.1842946.n4.nabble.com/MultiThreading-issues-with-Wicket-tp4663325.html Sent from the Users forum mailing list archive at Nabble.com. - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
Migrating from 1.4.21 to 6
Hi All, I'm wanting to upgrade to the latest version of wicket but am worried about the possible impact. Also I'm wanting to know the best migration plan. Do you think it would be best to jump straight to 6 or first upgrade to 5? Any tips or ideas would be much appreciated. thanks
