Logging library to be used with Spring Framework. Contains two mechanisms:
- Logger injection
- Logging aspects
In order to inject a logger instance into a spring managed bean use @Log annotation.
import org.slf4j.Logger;
import org.springframework.stereotype.Component;
@Component
public class BeanWithLogger {
@Log
private Logger logger;
@Log(fromClass = SomeOther.class)
private Logger logger2;
/* ... */
}
To enable logger injection with @Log, simply register LogInjector in spring context.
Example using spring-java-config:
import org.springframework.logging.inject.LogInjector;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class LogInjectorConfiguration {
@Bean
public LogInjector logInjector() {
return new LogInjector();
}
}
In order to log method invocations with aspects use @Logged annotation.
You can use this annotation on methods and classes.
import org.slf4j.Logger;
import org.springframework.stereotype.Component;
@Component
@Logged
public class BeanWithAspectLogging {
public void sayHello() {
/* ... */
}
public void sayHello(String hello) {
/* ... */
}
public String sayHelloAndThrowNullPointerException(String hello) {
logger.info("Inside method sayHelloReturnException. Hello: {}", hello);
throw new NullPointerException("Test exception");
}
}
To enable aspect logging just register LoggedAspect in spring context.
Example using spring-java-config:
import org.springframework.logging.aspect.LoggedAspect;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableAspectJAutoProxy;
@Configuration
@EnableAspectJAutoProxy(proxyTargetClass = true)
public class LoggedAspectConfiguration {
@Bean
public LoggedAspect loggedAspect() {
return new LoggedAspect();
}
}
Default console output for BeanWithAspectLogging#sayHelloAndThrowNullPointerException(String hello):
2013-09-04 11:43:24,561 [TRACE] o.s.u.l.a.b.BeanTypeAnnotated:118 - >>> BeanTypeAnnotated.sayHelloReturnException(..): [xxx]
/* Logs printed during method invocation */
2013-09-04 11:43:24,582 [ERROR] o.s.u.l.a.b.BeanTypeAnnotated:134 - XXX Error occured:
/* Exception stack trace */
2013-09-04 11:41:30,448 [TRACE] o.s.u.l.a.b.BeanTypeAnnotated:140 - <<< Returning BeanWithAspectLogging.sayHelloAndThrowNullPointerException(): null (14[ms])
Default console output can be overriden with custom implementation of MessageFormatter.
Default logger provider mechanism can be overriden with custom implementation of LoggerProvider.
In order to use this library add repository location into your pom.xml and add appropriate dependency.
<dependency>
<groupId>net.exacode.spring.logging</groupId>
<artifactId>spring-aspect</artifactId>
<version>${version.spring-logging}</version>
</dependency>
<!-- or -->
<dependency>
<groupId>net.exacode.spring.logging</groupId>
<artifactId>spring-inject</artifactId>
<version>${version.spring-logging}</version>
</dependency>
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