Simple performance logging with Spring

We had a problem recently where a call/response to the server was taking 10 seconds. We needed to figure out where the delay was, and the perfect way to do that was using the Spring PerformanceMonitorInterceptor. With Spring 2.0, adding it is a breeze.

In the applicationContext.xml

<bean id="timingLogger" class="org.springframework.aop.interceptor.PerformanceMonitorInterceptor">

<aop:aspectj-autoproxy>
<aop:config>
<aop:advisor pointcut="execution(* com.yourcompany.application.dao.*.*(..))" ref="timingLogger">
</aop:advisor>
</aop:config>
</aop:aspectj-autoproxy>

and then in log4j.properties

log4j.logger.org.springframework.aop.interceptor.PerformanceMonitorInterceptor=TRACE, stdouttrace
log4j.appender.stdouttrace=org.apache.log4j.ConsoleAppender
log4j.appender.stdouttrace.layout=org.apache.log4j.PatternLayout
log4j.appender.stdouttrace.layout.ConversionPattern=%m%n


We found the problem was not in the application, but with the dev server, which was not configured properly to resolve hosts...