Notify the use of logback specific system property
Logback documentation explains how to initialize the logging system and namely how the `logback.configurationFile` system property can be used to specify the configuration file to use. Spring Boot has an abstraction on top of that. A user can define the `logging.path` property regardless of the logging infrastructure it is using. Users following the logback documentation can be confused at first so we're not logging a warning when we found out that the logback specific property has been specified. Closes gh-2382
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				|  | @ -1019,6 +1019,9 @@ NOTE: The logging system is initialized early in the application lifecycle and a | |||
| logging properties will not be found in property files loaded via `@PropertySource` | ||||
| annotations. | ||||
| 
 | ||||
| TIP: Logging properties are independent of the actual logging infrastructure. As a | ||||
| result, specific configuration keys (such as `logback.configurationFile` for Logback) | ||||
| are not managed by spring Boot. | ||||
| 
 | ||||
| 
 | ||||
| [[boot-features-custom-log-levels]] | ||||
|  |  | |||
|  | @ -56,6 +56,8 @@ import ch.qos.logback.core.status.Status; | |||
|  */ | ||||
| public class LogbackLoggingSystem extends Slf4JLoggingSystem { | ||||
| 
 | ||||
| 	private static final String CONFIGURATION_FILE_PROPERTY = "logback.configurationFile"; | ||||
| 
 | ||||
| 	private static final Map<LogLevel, Level> LEVELS; | ||||
| 
 | ||||
| 	static { | ||||
|  | @ -102,6 +104,11 @@ public class LogbackLoggingSystem extends Slf4JLoggingSystem { | |||
| 			String configLocation, LogFile logFile) { | ||||
| 		getLogger(null).getLoggerContext().getTurboFilterList().remove(FILTER); | ||||
| 		super.initialize(initializationContext, configLocation, logFile); | ||||
| 		if (StringUtils.hasText(System.getProperty(CONFIGURATION_FILE_PROPERTY))) { | ||||
| 			getLogger(LogbackLoggingSystem.class.getName()).warn( | ||||
| 					"Ignoring '"+CONFIGURATION_FILE_PROPERTY+"' system property. " + | ||||
| 							"Please use 'logging.path' instead."); | ||||
| 		} | ||||
| 	} | ||||
| 
 | ||||
| 	@Override | ||||
|  |  | |||
|  | @ -141,6 +141,21 @@ public class LogbackLoggingSystemTests extends AbstractLoggingSystemTests { | |||
| 		assertFalse(new File(tmpDir() + "/tmp.log").exists()); | ||||
| 	} | ||||
| 
 | ||||
| 	@Test | ||||
| 	public void testLogbackSpecificSystemProperty() throws Exception { | ||||
| 		System.setProperty("logback.configurationFile", "/foo/my-file.xml"); | ||||
| 		try { | ||||
| 			this.loggingSystem.beforeInitialize(); | ||||
| 			this.loggingSystem.initialize(this.initializationContext, null, null); | ||||
| 			String output = this.output.toString().trim(); | ||||
| 			assertTrue("Wrong output:\n" + output, output.contains("Ignoring " + | ||||
| 					"'logback.configurationFile' system property. Please use 'logging.path' instead.")); | ||||
| 		} | ||||
| 		finally { | ||||
| 			System.clearProperty("logback.configurationFile"); | ||||
| 		} | ||||
| 	} | ||||
| 
 | ||||
| 	@Test(expected = IllegalStateException.class) | ||||
| 	public void testNonexistentConfigLocation() throws Exception { | ||||
| 		this.loggingSystem.beforeInitialize(); | ||||
|  |  | |||
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