Ranjan Kumar

java.net.SocketException: Too many open files

Ranjan Kumar — Wed, 11 Jan 2012 08:32:18 +0000

If you are getting “Too many open files” error in Java Environment on Linux, then refer to this following article:

Linux Increase The Maximum Number Of Open Files / File Descriptors (FD)

Filed under: Errors/Exceptions, Java / Java EE, JBoss, Linux

jtwain

Ranjan Kumar — Wed, 29 Sep 2010 09:55:36 +0000

How to acquire images with jtwain.

Download:
jtwain.zip
jtwain1.zip

References

http://www.java.net/author/jeff-friesen

Filed under: Projects Tagged: camera, capture, image, jeff-friesen, jtwain, scanner, twain

Messaging Protocols & Products

Ranjan Kumar — Wed, 07 Jul 2010 11:37:52 +0000

Messaging Protocols

Java Message Service
XMPP (Extensible Messaging and Presence Protocol): Messaging protocols for chats
STOMP (Streaming Text Oriented Messaging Protocol)
OpenWire: Native wire format of ActiveMQ.
AMQP (Advanced Message Queuing Protocol): Protocols for Business Messaging. AMQP implementations. HornetQ and ActiveMQ are also planning to implement AMQP in the future versions.

Messaging Products

Enterprise Messaging
Chat Messaging
- Jabber
- Jive SBS
- Google Talk
- ejabberd

Messaging protocols for emails:

SMTP (Simple Mail Transfer Protocol)
POP3 (Post Office Protocol)
IMAP4 (Internet Message Access Protocol)

Filed under: Java / Java EE, Messaging Tagged: activemq, amqp, ejabberd, fuse message broker, google talk, hornetq, imap, jabber, jive, jms, messaging, mqseries, openwire, pop, smtp, sonicmq, stomp, tibco, webshpere mq, xmpp

JUnit

Ranjan Kumar — Wed, 02 Jun 2010 11:36:13 +0000

Lets now adopt Test Driven Development approach. I am just new to JUnit (Unit testing framework for Java) and started learning and planning to use in some current projects.

Some Pointers:

JUnit in Action – Vincent Massol with Ted Husted Download pdf
Official Website
JUnit Primer
@sourceforge
JUnit best practices – JavaWorld
Eclipse Junit testing tutorial
Using JUnit With Eclipse IDE – O’Reilly Media
JUnit – Eclipse – Tutorial

Filed under: Java / Java EE

Parallel Computing and Java

Ranjan Kumar — Tue, 11 May 2010 05:05:06 +0000

There started a sudden discussion for our one software product. For which we are using quad core processors in the servers and the application is written in java. So the question is: The quad core processors are really being utilized by our application which is written in Java? I think my answer is NO, but still we need to verify it.

Started to explore on this topic and found some important link. Lets first go through this:

Filed under: Java / Java EE