StartupLoggingUtils (Solr 7.7.0 API)

java.lang.Object
- org.apache.solr.util.StartupLoggingUtils

```
public final class StartupLoggingUtils
extends Object
```
Handles programmatic modification of logging during startup
WARNING: This class should only be used during startup. For modifying log levels etc during runtime, SLF4J and LogWatcher must be used.

Constructor Summary

Constructors
Constructor Description

StartupLoggingUtils()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static boolean`	`changeLogLevel(String logLevel)`	Dynamically change log4j log level through property solr.log.level
`static void`	`checkLogDir()`	Checks whether mandatory log dir is given
`static String`	`getLoggerImplStr()`
`static String`	`getLogLevelString()`	Return a string representing the current static ROOT logging level
`static boolean`	`muteConsole()`	Disables all log4j2 ConsoleAppender's by modifying log4j configuration dynamically.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - StartupLoggingUtils
```
public StartupLoggingUtils()
```
- Method Detail
  - checkLogDir
```
public static void checkLogDir()
```
    Checks whether mandatory log dir is given
  - getLoggerImplStr
```
public static String getLoggerImplStr()
```
  - muteConsole
```
public static boolean muteConsole()
```
    Disables all log4j2 ConsoleAppender's by modifying log4j configuration dynamically. Must only be used during early startup
    
    Returns:
    
    true if ok or else false if something happened, e.g. log4j2 classes were not in classpath
  - changeLogLevel
```
public static boolean changeLogLevel(String logLevel)
```
    Dynamically change log4j log level through property solr.log.level
    
    Parameters:
    
    logLevel - String with level, should be one of the supported, e.g. TRACE, DEBUG, INFO, WARN, ERROR...
    
    Returns:
    
    true if ok or else false if something happened, e.g. log4j classes were not in classpath
  - getLogLevelString
```
public static String getLogLevelString()
```
    Return a string representing the current static ROOT logging level
    
    Returns:
    
    a string TRACE, DEBUG, WARN, ERROR or INFO representing current log level. Default is INFO