Archive for February, 2008

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Sat 23 Feb 2008

Oracle 10g Express edition

Posted by Pandian R under Announcement, oracle
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DB legends are releasing their edition as a miniature, previously MS-SQL came with their own mini server. MySQL is always small doing great jobs. and Here I am giving Oracle 10g Express edition. It is cool, very easy to install and get it running. Add to its great things, It offers a cool web interface (see the screenshot below), like Linux admin tools :) . Oracle says it is free to develop, deploy, and distribute. Those who are interested can get their copies at

http://www.oracle.com/technology/products/database/xe/index.html

Oracle web admin screenshot

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Mon 18 Feb 2008

Producer Consumer – the saviour!

Posted by Pandian R under java, patterns
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Hi,

I had a task of populating some collections several times,  before uploading them to DB. What happened was, memory had grown rapidly, and atlast the application died with OutOfMemoryError :(

That time my lead was suggesting to go to this pattern, Producer-Consumer!  Like, one guy will be populating the collection, In parallel another guy will be reading from the collection and update the db! Wonderful man, this design is highly scalable, if you implement correctly! For more info, see the simple example here, http://www.java2s.com/Code/Java/Threads/ProducerconsumerforJ2SE15usingconcurrent.htm

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Mon 18 Feb 2008

java.util.zip.ZipException: invalid CEN header (encrypted entry)

Posted by Pandian R under Errors, core java
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friends,This week started with some more problems :) . Nothing to worry, problems only feed us! Otherwise, who will give us job!!! Today I was trying to unzip a zip file and read the contents inside the file, using java.util.zip.ZipFile. It was working fine till I increased the file size. The zip file is around 160MB, and the single file inside that zip file is 4.5GB contains raw text. I hit with the exception

java.util.zip.ZipException: invalid CEN header (encrypted entry)

Pathetic, I was totally helpless! Later I came to know that It is a open bug in java, which will not support above 3.2G!  I am in darkness. Latermy lead had pointed out that is due to java’s non-compliance to zip64, which is fixed in jdk1.6, 24th build. I need to get it installed and get rid of this issue!

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