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Illegal Key Size
About a week ago, I wrote an article on how to encrypt with PHP and decrypt with Java. The funny thing is I got an error when I deployed the Java code into the live server! As a reminder, this is the...
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Update your Twitter status with Java
This article has been written for the version 2.1.7 of Twitter4J. If you want to use a newer version, please read the following article: Changes in Twitter4J 2.2.5 Some time ago, Twitter stopped...
View ArticleJDBC and the “zero” date
A few weeks ago, I was in the process of writing a little script in Java to extract data from a MySQL database. Because this is what we can call a micro project, I decided to simply use JDBC to talk to...
View ArticleClose ModalPanel if no error
It has been a very long time I wrote this code, but I thought I would share it with you as it is quite useful. If like me, you are an adept of RichFaces, you might have already seen and used the modal...
View ArticleDelete the components holding unwanted state
This is a small addition to a problem discussed on the MyFaces Wiki: http://wiki.apache.org/myfaces/ClearInputComponents Just in case the page is removed from the Wiki, please see below a copy of the...
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Make image backgrounds transparent with tolerance
In one of the projects I am working on at the moment, I needed to convert the background colour of an image to be transparent so the image looks better on a non-white background. Looking on the Web, I...
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Too many open files on Tomcat
The other day, one of my websites was not available anymore. Looking at the log files, I found the following exception: Dec 7, 2011 1:22:39 AM org.apache.jk.common.ChannelSocket acceptConnections...
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Changes in Twitter4J 2.2.5
Over a year ago, I wrote an article on how to update Twitter status using Twitter4J: Update your Twitter status with Java Note that I was using the version 2.1.7 of Twitter4J at that time. Following a...
View ArticleMD5 generates 31 bytes instead of 32
I wrote the following method to generate MD5 hashes: private static String md5(String input) throws NoSuchAlgorithmException { MessageDigest md = MessageDigest.getInstance("MD5"); byte[] messageDigest...
View ArticleEncrypt and decrypt with Java
Encryption is a very important subject in computer science which developers need to deal with quite often. I already wrote a few years ago an article containing some code to encrypt data with PHP and...
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