links for 2011-05-30

• Seam Framework – How do I use multiple dynamic EntityManager's in Seam?
  For the purposes of this article a Seam project named example will be used. This is only important in regards to remembering the default generated naming of the persistence unit and other configuration, ect… which will default to the project name, example.
  (tags: seam dynamic entitty manager change database connection at runtime dynamically programatically)
• byte array as a parameter in JasperReports (Open Source Projects forum at JavaRanch)
  I found the solution to my problem, I'll put the solution here if someone has the same problem.
  I was defining byte array parameter as an object and when I was adding it to the page it was by default added as a String in text field. The byte array was image which I wanted to display on the report, so first I had to convert byte array to ByteArrayInputStream on the Java side, define parameter as type InputStream, and then display it within the image, also as InputStream type.
  (tags: java reports jasperreports jasper ireport reporting show image byte array)

links for 2011-05-27

• Capitalize.java
  public static String capitalize(String s) { if (s.length() == 0) return s; return s.substring(0, 1).toUpperCase() + s.substring(1).toLowerCase(); }
  (tags: capitalize string java tips programming)
• Recommendations for Charts and Graphics
  The Recommendations for Chart and Graphic comprise guidelines for the use of charts, graphics, images, colors and text.
  (tags: charts graficas graficos diseño design)
• label – How to wrap category labels in JfreeChart, Answer – LogResource
  NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
  rangeAxis.setMaximumCategoryLabelLines(2);
  (tags: jfreechart line break label split)
• www.jfree.org • View topic – Remove space between bars in a horizontal bar Graph
  (BarRenderer(renderer)).setItemMargin(0.0);
  (tags: jfreechart remove space between bars barchart plot)
• Rotate Labels JFreeChart « Andrew E. Bruno
  CategoryPlot plot = (CategoryPlot)chart.getPlot(); CategoryAxis xAxis = (CategoryAxis)plot.getDomainAxis(); xAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);
  (tags: jfreechart java chart rotate label)

links for 2011-05-24

• Backup your MySQL databases automatically with AutoMySQLBackup | MDLog:/sysadmin
  AutoMySQLBackup has all the features I needed: it can backup a single database, multiple databases, or all the databases on the server; each database is saved in a separate file that can be compressed (with gzip or bzip2); it will rotate the backups and not keep them filling your hard drive (as normal in the daily backup you will have only the last 7 days of backups, the weekly if enabled will have one for each week, etc.). It has also some other features (check the project homepage for full details), that I am not using myself (like email logs for example), but other peoples might find interesting.
  (tags: mysql autobackup backup database sysadmin dba)
• 10 Ways to Automatically & Manually Backup MySQL Database – Noupe Design Blog
  MySQL is one of the most popular open source database management system for the development of interactive Websites.

  If your site stores its sensitive data in a MySQL database, you will most definitely want to backup that information so that it can be restored in case of any disaster (we all have been there).

  There are several ways to backup MySQL data. In this article we’ll look at how to backup your databases using different methods, we will also learn how to achieve an automatic backup solution to make the process easier. Starting with the mysqldump utility that comes with MySQL, we will review several examples using mysqldump, including the backup of your database to a file, another server, and even a compressed gzip file and send it to your email.

  (tags: mysql backup autobackup database sysadmin dba)
• SSH with authentication key instead of password
  SSH is a must use tool for system administrators. However, residing access security on a human entered password is not very wise. Script kiddies may break into your system due to a lazy user with a weak password. And it is beyond the system administrator power to make users choose good passwords.
  (tags: linux ssh authentication key keys)
• JBoss 5 GA on Debian linux
  This short tutorial describes how to configure JBoss Application Server (Jboss GA 5.1.0) on a debian linux (Debian GNU/Linux 5.x “Lenny” ). Article starts with installation of java JDK and continues with JBoss installation and basic configuration according to standard file system hierarchy. Also init.d. scripts configuration is given here.
  (tags: jboss debian linux start as service howto)
• Seam Framework – 15 gotchas in seam
  15 gotchas in seam
  (tags: seam tips java framework debug gotcha)
• Java, write once, run away!: October 2009
  There seem to be a problem with IE8 and Seam applications. We are running Seam 2.1, JSF 1.2 and Facelets, and I cannot say for sure where the bug is. For all I know its a bug with IE8.

  There seem to be problems when creating long-running conversations. In link using IE8 the cid doesnt appear. Somehow it is stripped or doesn't render correctly, and it causes some strange behaviour.
  When trying to create a long running conversation by pushing an edit link for instance, we get a "Your session has timeout" exception.

  We fixed this IE8 problem by telling Internet Explorer to emulate IE7 in pages.xml

  <page view-id="*">
  <header name="X-UA-Compatible">IE=EmulateIE7</header>
  </page>

  I suggest you do the same until the bug is identified and fixed.

  (tags: seam ie8 internet explorer 8 bug ie7 7)

links for 2011-05-20

• Obscured Clarity: Get First Day of Month Date Object in Java
  # import java.text.DateFormat;
  # import java.text.SimpleDateFormat;
  # import java.util.Calendar;
  # import java.util.Date;
  #
  # // Java 1.4+ Compatible
  # //
  # // The following example code demonstrates how to get
  # // a Date object representing the first day of the month
  # // relative to a given Date object.
  #
  # public class GetFirstDayOfMonth {
  #
  # public static void main(String[] args) {
  #
  # Date today = new Date();
  #
  # Calendar calendar = Calendar.getInstance();
  # calendar.setTime(today);
  #
  # calendar.set(Calendar.DAY_OF_MONTH, 1);
  #
  # Date firstDayOfMonth = calendar.getTime();
  #
  # DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
  # System.out.println("Today : " + sdf.format(today));
  # System.out.println("First Day of Month: " + sdf.format(firstDayOfMonth));
  # }
  # }
  (tags: java get first day of month tips programming)

links for 2011-05-13

• Midnight Commander / MC Tutorial
  Command line: For anonymous sites, the format is cd ftp://ftp.yoursite.com

  To connect to a site with a password (non-anonymous),
  cd ftp://username:password@ftp.yoursite.com
  (This may return an error message if you did not specify a directory, but will connect you anyway.)
  Or type in the full path: cd ftp://username:password@ftp.yoursite.com/public_html

  Left / Right dropdown menu: will connect on that respective side. Arrow down to FTP link, or use hotkey P. A dialog box will request the FTP address in the same format:
  Anonymous: ftp.yoursite.com
  Non-anonymous: username:password@ftp.yoursite.com/public_html

  (tags: ftp file transfer mc midnight commander howto manual tutorial midnightcommander linux sysadmin)

links for 2011-05-11

• INDICADORES EN MANTENIMIENTO
  Uno de los problemas a los que se enfrenta un responsable de mantenimiento que quiere mejorar los resultados del departamento a su cargo es que debe MEDIR la evolución de los aspectos más importantes que definen o determinan la calidad de su trabajo. ¿pero cuales son esos indicadores? ¿Qué parámetros determinan que el trabajo de un departamento se está haciendo bien o mal?
  (tags: mantenimiento equipos)
• Add A Line Break To Your Cell (Excel 2002/2003) Windows Fanatics
  The trick to this is that if you want to add a line break within a cell, press Alt + Enter, instead of just Enter.
  (tags: excel insert line break in cell tips office)
• Add a UAC shield to a button when elevation is required for admin tasks – CodeProject
  Any application that does not always need administrator privileges should not run with them by default. However, when a user wants to perform a task that requires elevation, you need to show them that this is required by displaying the Vista shield icon. When this is clicked, your application will then need to restart with administrator privileges. Interested? Then read on…
  (tags: uac windows vista 7 shield admin task elevation codeproject .net C#)

links for 2011-05-10

• Computer Noise Problems? Don’t Ignore Them! Windows Fanatics
  Q: I have a Windows 7 laptop that makes random noises. Any thoughts, or is the laptop possessed? – Beth

  A: Much like with your car, when a computer starts to make random or weird noises, you should not ignore them.

  (tags: computer pc maintenance tips repair fix)

links for 2011-05-09

• Seam Framework – HTTP client-server optimization strategies
  For any Seam-powered website, optimizing the communication between the webbrowser client and the server is crucial. Although some of these optimization strategies can be considered generic, and some are handled by Seam on the server-side automatically, many others depend on the content that is being served. In other words, Seam can only do so much automatically and you, as the developer of a website, will have to manually tune your system for optimal performance and scalability.

  This document outlines some common strategies useful for Seam application developers.

  (tags: seam optimize optimizacion http compression caching cache jboss)

links for 2011-05-08

• obtengo el error 'access denied for user ''@'localhost' – Foros del Web
  mysql> SET PASSWORD FOR 'usuario'@'host' = PASSWORD('contraseña');
  (tags: mysql access denied to user password)
• David Ghedini's Blog: Install JBoss 5.1 on CentOS
  Step 5: Create a start/stop/restart script for JBoss.

  For our JBoss script we will simply copy the existing jboss_init_redhat.sh script located at at /usr/share/jboss-5.1.0.GA/bin, copy it to /etc/init.d and rename it to 'jboss':

  (tags: start jboss as service daemon centos)
• Setting Global Environment Variables in CentOS | Allied Technique Blog
  1. Create a new file called java.sh

  vim /etc/profile.d/java.sh

  2. Within this file, initialize the necessary environment variables

  export JRE_HOME=/usr/java/jdk1.5.0_12/jre
  … more variables

  Now when you restart your machine, the environment variables within java.sh will be automatically initialized (checkout /etc/profile if you are curious how the files in /etc/profile.d/ are loaded) .

  (tags: linux set environment variables boot startup)
• Zip a Folder in Linux – enrii.blog
  zip -9 -r <zip file> <folder name>

  To zip a single file:

  zip -9 <zip file> <filename>

  Use "-9" for best compression. The compressed file works fine with Windows XP compression tool.

  (tags: linux zip compress files file)

links for 2011-05-07

• MySQL Change root Password
  1) Login to mysql server, type the following command at shell prompt:
  $ mysql -u root -p

  2) Use mysql database (type command at mysql> prompt):

  mysql> use mysql;

  3) Change password for user vivek, enter:

  mysql> update user set password=PASSWORD("NEWPASSWORD") where User='vivek';

  4) Finally, reload the privileges:

  mysql> flush privileges;
  mysql> quit

  (tags: mysql change root password howto dba database admin)