Joomla! site syndication http://www.phamngochai.net Wed, 08 Feb 2012 22:25:16 +0100 FeedCreator 1.7.2 http://www.phamngochai.net/images/M_images/joomla_rss.png http://www.phamngochai.net Joomla! site syndication http://www.phamngochai.net/programming/asp.net-mvc3-jquery-form-post-and-redirect.html It has been some time since I touched ASP and M$ stuff. Today while working with ASP.NET and jQueryMobile, I discovered that my redirection no longer worked. If you have a form POST to an action that return a Redirect like: [code] [HttpPost] public ActionResult Reserve(ReserveViewModel reserveViewModel) { .... return Redirect(redirectUrl); } [/code] ISS will return an HTTP 302 redirection, in order for jQuery to redirect to that URL instead of using AJAX to handle. Your form must have an data-ajax= false , like: [code] <form action= /Ticket/Reserve data-ajax= false method= post > .... </form> [/code] That will disable AJAX handling on that form and your browser will happily redirect to the new address. Computer stuff - Programming Sat, 26 Nov 2011 02:18:20 +0100 http://www.phamngochai.net/softwares/java-and-program-terminated-with-signal-11-segmentation-fault..html Recently we have encoutered several jvm crashes on our test server which is on Amazon cloud. This server is running on CentOS 5.5 x86_64 with Oracle JRE 1.6.0_22. We have Fusesource ServiceMix 4.2.0-fuse-02-00, PostgreSQL 8.4 on this server. This system has been running for more than a year without any problem but last week, ServiceMix just crashed a few times a day without showing anything in the log. I tried to upgrade to Oracle JDK 1.6.0_27 but the problem persisted. I found out that the ulimit for core file size for the user that we use to run servicemix is 0 [code] core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 122944 max locked memory (kbytes, -l) 32 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 10240 cpu time (seconds, -t) unlimited max user processes (-u) 122944 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited [/code] I changed that to unlimited [code] ulimit -c unlimited [/code] and core dump files were produced whenever ServiceMix (or JVM actually) crashes. I have two core dump files, one from JRE 1.6.0_22 the other from JDK 1.6.0_27. With the help of gdb, I was able to find the problem: [code] gdb /usr/java/jre1.6.0_22/bin/java /usr/local/apache-servicemix-4.2.0-fuse-02-00/core.3595 GNU gdb (GDB) Red Hat Enterprise Linux (7.0.1-37.el5_7.1) Copyright (C) 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type show copying and show warranty for details. This GDB was configured as x86_64-redhat-linux-gnu . For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /usr/java/jre1.6.0_22/bin/java...(no debugging symbols found)...done. [New Thread 4249] [New Thread 13326] [New Thread 13302] .... [New Thread 3595] Reading symbols from /lib64/libpthread.so.0...(no debugging symbols found)...done. [Thread debugging using libthread_db enabled] Loaded symbols for /lib64/libpthread.so.0 Reading symbols from /usr/java/jdk1.6.0_27/bin/../jre/lib/amd64/jli/libjli.so...(no debugging symbols found)...done. Loaded symbols for /usr/java/jdk1.6.0_27/bin/../jre/lib/amd64/jli/libjli.so Reading symbols from /lib64/libdl.so.2...(no debugging symbols found)...done. Loaded symbols for /lib64/libdl.so.2 Reading symbols from /lib64/libc.so.6...(no debugging symbols found)...done. Loaded symbols for /lib64/libc.so.6 Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done. Loaded symbols for /lib64/ld-linux-x86-64.so.2 Reading symbols from /usr/java/jdk1.6.0_27/jre/lib/amd64/server/libjvm.so...(no debugging symbols found)...done. Loaded symbols for /usr/java/jdk1.6.0_27/jre/lib/amd64/server/libjvm.so Reading symbols from /lib64/libm.so.6...(no debugging symbols found)...done. Loaded symbols for /lib64/libm.so.6 Reading symbols from /lib64/librt.so.1...(no debugging symbols found)...done. Loaded symbols for /lib64/librt.so.1 Reading symbols from /usr/java/jdk1.6.0_27/jre/lib/amd64/libverify.so...(no debugging symbols found)...done. Loaded symbols for /usr/java/jdk1.6.0_27/jre/lib/amd64/libverify.so Reading symbols from /usr/java/jdk1.6.0_27/jre/lib/amd64/libjava.so...(no debugging symbols found)...done. Loaded symbols for /usr/java/jdk1.6.0_27/jre/lib/amd64/libjava.so Reading symbols from /lib64/libnsl.so.1...(no debugging symbols found)...done. Loaded symbols for /lib64/libnsl.so.1 Reading symbols from /lib64/libnss_files.so.2...(no debugging symbols found)...done. Loaded symbols for /lib64/libnss_files.so.2 Reading symbols from /usr/java/jdk1.6.0_27/jre/lib/amd64/libzip.so...(no debugging symbols found)...done. Loaded symbols for /usr/java/jdk1.6.0_27/jre/lib/amd64/libzip.so Reading symbols from /usr/java/jdk1.6.0_27/jre/lib/amd64/libnet.so...(no debugging symbols found)...done. Loaded symbols for /usr/java/jdk1.6.0_27/jre/lib/amd64/libnet.so Reading symbols from /usr/java/jdk1.6.0_27/jre/lib/amd64/libmanagement.so...(no debugging symbols found)...done. Loaded symbols for /usr/java/jdk1.6.0_27/jre/lib/amd64/libmanagement.so Reading symbols from /lib64/libnss_dns.so.2...(no debugging symbols found)...done. Loaded symbols for /lib64/libnss_dns.so.2 Reading symbols from /lib64/libresolv.so.2...(no debugging symbols found)...done. Loaded symbols for /lib64/libresolv.so.2 Reading symbols from /usr/java/jdk1.6.0_27/jre/lib/amd64/libnio.so...(no debugging symbols found)...done. Loaded symbols for /usr/java/jdk1.6.0_27/jre/lib/amd64/libnio.so Reading symbols from /usr/java/jdk1.6.0_27/jre/lib/amd64/librmi.so...(no debugging symbols found)...done. Loaded symbols for /usr/java/jdk1.6.0_27/jre/lib/amd64/librmi.so Core was generated by `/usr/java/latest/bin/java -server -Xms1024M -Xmx4096M -XX:MaxPermSize=256m -XX:'. Program terminated with signal 11, Segmentation fault. #0 0x00002aaaaf640360 in Java_java_net_SocketInputStream_socketRead0 () from /usr/java/jdk1.6.0_27/jre/lib/amd64/libnet.so [/code] The other core dumpl file also showed me that the JVM crashed at .../amd64/libnet.so Google brought me to JVM bug 7059899 http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7059899 Follow the workaround mentioned there, I change the DEFAULT_JAVA_OPTS in [SMX_HOME]/bin/servicemix to: [code] DEFAULT_JAVA_OPTS= -Xms$JAVA_MIN_MEM -Xmx$JAVA_MAX_MEM -XX:MaxPermSize=256m -XX:PermSize=256m -XX:StackShadowPages=20 [/code] After restarting, my ServiceMix has been running fine since. Computer stuff - Softwares Thu, 20 Oct 2011 23:52:45 +0100 http://www.phamngochai.net/misc/mp4-video-encoding-for-motorola-xoom.html If you try to play those 1080p, 720p mkv files directly in your Xoom, you'll find it very jerky and seeking/skipping takes forever. That's because Xoom only supports base line profile of H264, in order to play those files smoothly, you need to reencode them. I dont want to install handbrake so what I use is: [code] ffmpeg -i /path/to/file.mkv -threads 4 -vcodec libx264 -x264opts ref=3:bframes=0:subq=6:mixed-refs=0:weightb=0:8x8dct=0:trellis=0:cabac=0:weightp=0 -acodec libfaac -ab 128k -ac 2 -ar 48000 -crf 24 -f mp4 outfile.mp4 [/code] Computer stuff - Misc Mon, 01 Aug 2011 23:01:36 +0100 http://www.phamngochai.net/misc/motorola-xoom-and-adobe-reader.html I just got my Motorola Xoom Wifi only a few days ago, one of the reasons that I bought it is because I want to read ebooks (pdf, chm...) on it so I spent a huge amount of time getting Adobe Reader on it. Obviously it's not on the Android market since this is a Honeycomb device, so I tried appbrain, now I can see Adobe Reader but Xoom still refuses to install it. I also tried to install a few free pdf readers but none of them actually shows the pdf nicely. When I almost gave up, I saw that Adobe actully put the Adobe Reader for Android on their FTP server, et voila... ftp://ftp.adobe.com/pub/adobe/reader/android/10.x/10.0.1/ I downloaded the apk file, do a adb install AdobeReader.apk (ftp://ftp.adobe.com/pub/adobe/reader/android/10.x/10.0.1/AdobeReader.apk) the next moment I can see my pdfs are nicely displayed on my Xoom :) Computer stuff - Misc Mon, 25 Apr 2011 23:33:47 +0100 http://www.phamngochai.net/misc/vinaphone-mf-190zte-3g-usb-device-in-linux.html I was back in Vietnam for the last 3 weeks for my Tet holiday. Back there, my house does not have internet connection, luckily I've got a 3G USB device from my friend, which is MF 190(ZTE). This device comes from Vinaphone - one of the Mobile phone service providers in Vietnam. As usual, this device does not come with linux driver, but after fighting with it for more than half a day, I was able to get it to work on my Archlinux x86_64 laptop. The reason why it took so long was that the signal at the place (my friend's cafe) was too low, I did not know that until I brought it outside. All that is needed for the 3G USB to works under Archlinux is usb_modeswitch (from community repo) and wvdial (from extra repo). After installing them, when you plug it in, you should see a GSM modem in dmesg. The rests are just wvdial configurarion. Computer stuff - Misc Thu, 17 Feb 2011 09:59:26 +0100