Configure Log4J for Hibernate

Sometime, you see that hibernate application starts with a warning message

log4j:WARN No appenders could be found for logger (<Class Name>).
log4j:WARN Please initialize the log4j system properly.


this is due to your hibernate application don't have log4j setup.

Create a file named log4j.properties in the root directory and add the following lines:

### shows logs to standard output ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### set log levels - for more verbose logging change 'info' to 'debug' ###

log4j.rootLogger=debug, stdout

log4j.logger.org.hibernate=info
#log4j.logger.org.hibernate=debug

### log HQL query parser activity
#log4j.logger.org.hibernate.hql.ast.AST=debug

### log just the SQL
log4j.logger.org.hibernate.SQL=debug

### log JDBC bind parameters ###
log4j.logger.org.hibernate.type=info

### log cache activity ###
log4j.logger.org.hibernate.cache=info

### enable the following line if you want to track down connection ###
### leakages when using DriverManagerConnectionProvider ###
log4j.logger.org.hibernate.connection.DriverManagerConnectionProvider=trace