General blog about subtle tricks in Java language (NIO, File Transactions, i18n, Logging). http://www.myjavatricks.com http://blogs.law.harvard.edu/tech/rss Sun, 21 Sep 2008 21:33:36 -0700 Sun, 21 Sep 2008 09:25:10 -0700 commons-transaction library from apache has a serious issue. Memory leak in GenericLockmanager. See how to fix it here... http://myjavatricks.com/jtfs.aspx 63E244C2-0E72-41F5-9A4E-AA120313798B Sun, 21 Sep 2008 21:25:10 -0700 If you are using Java to deliver web applications, usual "three tier" apps you probably never needed something like this. However, if you are writing servers or services using Java, it is likely that you needed to create/change/delete/move multiple files around. To ensure that the operation is not partly done, you need a transaction. One approach to file based transactions is described here. http://myjavatricks.com/jtfs.aspx 63E244C0-0E72-41F5-9A4E-AA120313798B Sun, 21 Sep 2008 21:25:10 -0700 New IO in Java is a set of APIs that allow faster access to files using memory mapping and native code as well as API for non-blocking sockets. To learn more about these features check out this link where I write about common misconceptions and issues with the NIO server implementation. Following this design will produce fast scalable NIO server that can handle thousands, if not tens of thousands of concurrent connections. http://myjavatricks.com/nioperformancetips.aspx 30A2AEEB-9CE8-4138-8A8E-747C3E601AEE Fri, 5 Nov 2007 14:25:11 -0700 In many Java applications i18n just happens. We use resource files, to localize the presentation and never worry about character encodings. However, if you have to process double-byte characters by reading them from some file, you need to make sure you use proper character set encodings if you do not want to be dependent on the underlying operating system. It is simple to do, once you do it. Read about it here. http://myjavatricks.com/i18nfiles.aspx 4DB4E48E-3A2D-44D4-BFCC-D48D0A1F497E Fri, 2 Nov 2007 14:25:12 -0700 Every serious application should use logging. System.out.println should be strictly forbidden for logging. Why? Well, to start with it is at least 5 times slower then, for example, log4j. I find log4j a necessesity on every project. Every time I start new project I think about using latest java logging, and every time I somehow give up. Log4j interface is so simple, straeight-forward and efficient that I just cannot bring myself to abendon it. In this entry, I write about simple do's and don'ts with log4j logging. http://myjavatricks.com/logging.aspx 4DB4E48E-3A2D-44D4-BFCC-D48D0A1F498E Mon, 5 Nov 2007 09:40:12 -0700 Use custom serialization to transfer files. Read about it here. Fully functional object is provided as a part of this article. http://myjavatricks.com/serFT.aspx 4DB4E48E-3A2D-44D4-BFCC-D48D0A1F498F Wed, 30 Jan 2008 11:53:12 -0700