spring-security-samples/servlet/xml/java/saml2/login-logout/src/main/resources/logback.xml

<configuration>
	<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
	<encoder>
		<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
	</encoder>
	</appender>
	
	 <logger name="org.springframework.security" level="TRACE"/>

	<root level="TRACE">
		<appender-ref ref="STDOUT" />
	</root>

</configuration>