I discussed options for logging Hibernate-generated SQL in an earlier post but today I was trying to figure out how to see the SQL from groovy.sql.Sql and didn’t have much luck at first. The core problem is that the Sql class uses a java.util.logging.Logger (JUL) while the rest of the world uses a Log4j logger (often with a Commons Logging or SLF4J wrapper). I assumed that since I am using the Grails support for JUL -> Log4j bridging (enabled with the grails.logging.jul.usebridge = true setting in Config.groovy) that all I needed to do was add the class name to my log4j DSL block:
1 2 3 4 5 6 7 | log4j = { error 'org.codehaus.groovy.grails', 'org.springframework', 'org.hibernate', 'net.sf.ehcache.hibernate' debug 'groovy.sql.Sql'} |
but that didn’t work. Some googling led to this mailing list discussion which has a solution involving a custom java.util.logging.Handler to pipe JUL log messages for the 'groovy.sql.Sql' logger to Log4j. That seemed like overkill to me since theoretically that’s exactly what grails.logging.jul.usebridge = true already does. I realized I had no idea how the bridging worked, so I started looking at the implementation of this feature.
It turns out that this is handled by the Grails “logging” plugin (org.codehaus.groovy.grails.plugins.log4j.LoggingGrailsPlugin) which calls org.slf4j.bridge.SLF4JBridgeHandler.install(). This essentially registers a listener that receives every JUL log message and pipes it to the corresponding SLF4J logger (typically wrapping a Log4j logger) with a sensible mapping of the different log levels (e.g. FINEST -> TRACE, FINER -> DEBUG, etc.)
So what’s the problem then? While grails.logging.jul.usebridge = true does configure message routing, it doesn’t apply level settings from the log4j block to the corresponding JUL loggers. So although I set the level of 'groovy.sql.Sql' to debug, the JUL logger level is still at the default level (INFO). So all I need to do is programmatically set the logger’s level to DEBUG (or TRACE to see everything) once, e.g. in BootStrap.groovy
1 2 3 4 5 6 7 8 9 | import groovy.sql.Sqlimport java.util.logging.Levelclass BootStrap { def init = { servletContext -> Sql.LOG.level = Level.FINE }} |
Reference: Grails SQL Logging part 2 – groovy.sql.Sql from our JCG partner Burt Beckwith at the An Army of Solipsists blog.
related to this, any idea how do we see the json if we are using mongodb?