Monthly Archives: July 2009

GURFL data

GURFL file is a list of operators and their associated IP address ranges. This is a good way to find out from which mobile carrier (ie. which country) does a request come from. Earlier it was available at:  But now … Continue reading

Posted in Mobile | 3 Comments

Log4j errors : log4j:WARN No appenders could be found for logger, log4j:WARN Please initialize the log4j system properly

This is a very common problem, it occurs when not found in classpath. Create a file called Place it in the root folder where your java classes are found. When log4j initializes, it will look for a file … Continue reading

Posted in Java, log4j | Leave a comment

org.h2.jdbc.JdbcSQLException: The object is already closed [90007-113]

While running junit using in memory database H2 I was hitting this error. I was testing my spring DAO classes that are using JDBCTemplate. In a single Junit testing, to test various scenario  I was calling a single DAO method … Continue reading

Posted in Database, h2, hsqldb | Leave a comment