PropertyConfigurator (reload4j 1.2.26 API)

java.lang.Object
- org.apache.log4j.PropertyConfigurator

All Implemented Interfaces:

Configurator
```
public class PropertyConfigurator
extends Object
implements Configurator
```
Allows the configuration of log4j from an external file. See doConfigure(String, LoggerRepository) for the expected format.
It is sometimes useful to see how log4j is reading configuration files. You can enable log4j internal logging by defining the log4j.debug variable.
As of log4j version 0.8.5, at class initialization time class, the file log4j.properties will be searched from the search path used to load classes. If the file can be found, then it will be fed to the configure(java.net.URL) method.
The PropertyConfigurator does not handle the advanced configuration features supported by the DOMConfigurator such as support custom ErrorHandlers, nested appenders such as the AsyncAppender, etc.
All option values admit variable substitution. The syntax of variable substitution is similar to that of Unix shells. The string between an opening "${" and closing "}" is interpreted as a key. The value of the substituted variable can be defined as a system property or in the configuration file itself. The value of the key is first searched in the system properties, and if not found there, it is then searched in the configuration file being parsed. The corresponding value replaces the ${variableName} sequence. For example, if java.home system property is set to /home/xyz, then every occurrence of the sequence ${java.home} will be interpreted as /home/xyz.

Since:

0.8.1

Author:

Ceki Gülcü, Anders Kristensen

Field Summary

Fields
Modifier and Type	Field and Description
`static String`	`LOGGER_FACTORY_KEY` Key for specifying the `LoggerFactory`.
`protected LoggerFactory`	`loggerFactory`
`protected Hashtable`	`registry` Used internally to keep track of configured appenders.

Fields inherited from interface org.apache.log4j.spi.Configurator
INHERITED, NULL

Constructor Summary

Constructors
Constructor and Description

PropertyConfigurator()

Constructors
Constructor and Description
`PropertyConfigurator()`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`static void`	`configure(InputStream inputStream)` Reads configuration options from an InputStream.
`static void`	`configure(Properties properties)` Read configuration options from `properties`.
`static void`	`configure(String configFilename)`
`static void`	`configure(URL configURL)` Read configuration options from url `configURL`.
`static void`	`configureAndWatch(String configFilename)` Like `configureAndWatch(String, long)` except that the default delay as defined by `FileWatchdog.DEFAULT_DELAY` is used.
`static void`	`configureAndWatch(String configFilename, long delay)` Read the configuration file `configFilename` if it exists.
`protected void`	`configureLoggerFactory(Properties props)` Check the provided `Properties` object for a `LoggerFactory` entry specified by `LOGGER_FACTORY_KEY`.
`void`	`doConfigure(InputStream inputStream, LoggerRepository hierarchy)` Read configuration options from url `configURL`.
`void`	`doConfigure(Properties properties, LoggerRepository hierarchy)` Read configuration options from `properties`.
`void`	`doConfigure(String configFileName, LoggerRepository hierarchy)` Read configuration from a file.
`void`	`doConfigure(URL configURL, LoggerRepository hierarchy)` Read configuration options from url `configURL`.
`protected void`	`parseCatsAndRenderers(Properties props, LoggerRepository hierarchy)` Parse non-root elements, such non-root categories and renderers.

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

- Field Detail
  - registry
```
protected Hashtable registry
```
    Used internally to keep track of configured appenders.
  - loggerFactory
```
protected LoggerFactory loggerFactory
```
  - LOGGER_FACTORY_KEY
```
public static final String LOGGER_FACTORY_KEY
```
    Key for specifying the LoggerFactory. Currently set to "log4j.loggerFactory".
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - PropertyConfigurator
```
public PropertyConfigurator()
```
- Method Detail
  - doConfigure
```
public void doConfigure(String configFileName,
                        LoggerRepository hierarchy)
```
    Read configuration from a file. The existing configuration is not cleared nor reset. If you require a different behavior, then call resetConfiguration method before calling doConfigure.
    The configuration file consists of statements in the format key=value. The syntax of different configuration elements are discussed below.
    Repository-wide threshold
    
    The repository-wide threshold filters logging requests by level regardless of logger. The syntax is:
```
 log4j.threshold=[level]
 
```
    The level value can consist of the string values OFF, FATAL, ERROR, WARN, INFO, DEBUG, ALL or a custom level value. A custom level value can be specified in the form level#classname. By default the repository-wide threshold is set to the lowest possible value, namely the level ALL.
    
    Appender configuration
    
    Appender configuration syntax is:
```
 # For appender named appenderName, set its class.
 # Note: The appender name can contain dots.
 log4j.appender.appenderName=fully.qualified.name.of.appender.class

 # Set appender specific options.
 log4j.appender.appenderName.option1=value1
 ...
 log4j.appender.appenderName.optionN=valueN
 
```
    For each named appender you can configure its Layout. The syntax for configuring an appender's layout is:
```
 log4j.appender.appenderName.layout=fully.qualified.name.of.layout.class
 log4j.appender.appenderName.layout.option1=value1
 ....
 log4j.appender.appenderName.layout.optionN=valueN
 
```
    The syntax for adding Filters to an appender is:
```
 log4j.appender.appenderName.filter.ID=fully.qualified.name.of.filter.class
 log4j.appender.appenderName.filter.ID.option1=value1
 ...
 log4j.appender.appenderName.filter.ID.optionN=valueN
 
```
    The first line defines the class name of the filter identified by ID; subsequent lines with the same ID specify filter option - value paris. Multiple filters are added to the appender in the lexicographic order of IDs.
    The syntax for adding an ErrorHandler to an appender is:
```
 log4j.appender.appenderName.errorhandler=fully.qualified.name.of.filter.class
 log4j.appender.appenderName.errorhandler.root-ref={true|false}
 log4j.appender.appenderName.errorhandler.logger-ref=loggerName
 log4j.appender.appenderName.errorhandler.appender-ref=appenderName
 log4j.appender.appenderName.errorhandler.option1=value1
 ...
 log4j.appender.appenderName.errorhandler.optionN=valueN
 
```
    Configuring loggers
    
    The syntax for configuring the root logger is:
```
 log4j.rootLogger=[level], appenderName, appenderName, ...
 
```
    This syntax means that an optional level can be supplied followed by appender names separated by commas.
    The level value can consist of the string values OFF, FATAL, ERROR, WARN, INFO, DEBUG, ALL or a custom level value. A custom level value can be specified in the form level#classname.
    If a level value is specified, then the root level is set to the corresponding level. If no level value is specified, then the root level remains untouched.
    The root logger can be assigned multiple appenders.
    Each appenderName (separated by commas) will be added to the root logger. The named appender is defined using the appender syntax defined above.
    For non-root categories the syntax is almost the same:
```
 log4j.logger.logger_name=[level|INHERITED|NULL], appenderName, appenderName, ...
 
```
    The meaning of the optional level value is discussed above in relation to the root logger. In addition however, the value INHERITED can be specified meaning that the named logger should inherit its level from the logger hierarchy.
    If no level value is supplied, then the level of the named logger remains untouched.
    By default categories inherit their level from the hierarchy. However, if you set the level of a logger and later decide that that logger should inherit its level, then you should specify INHERITED as the value for the level value. NULL is a synonym for INHERITED.
    Similar to the root logger syntax, each appenderName (separated by commas) will be attached to the named logger.
    See the appender additivity rule in the user manual for the meaning of the additivity flag.
    ObjectRenderers
    
    You can customize the way message objects of a given type are converted to String before being logged. This is done by specifying an ObjectRenderer for the object type would like to customize.
    The syntax is:
```
 log4j.renderer.fully.qualified.name.of.rendered.class = fully.qualified.name.of.rendering.class
 
```
    As in,
```
 log4j.renderer.my.Fruit = my.FruitRenderer
 
```
    ThrowableRenderer
    
    You can customize the way an instance of Throwable is converted to String before being logged. This is done by specifying an ThrowableRenderer.
    The syntax is:
```
 log4j.throwableRenderer=fully.qualified.name.of.rendering.class
 log4j.throwableRenderer.paramName=paramValue
 
```
    As in,
```
 log4j.throwableRenderer = org.apache.log4j.EnhancedThrowableRenderer
 
```
    Logger Factories
    
    The usage of custom logger factories is discouraged and no longer documented.
    Resetting Hierarchy
    
    The hierarchy will be reset before configuration when log4j.reset=true is present in the properties file.
    Example
    
    An example configuration is given below. Other configuration file examples are given in the examples folder.
```
 # Set options for appender named "A1".
 # Appender "A1" will be a SyslogAppender
 log4j.appender.A1=org.apache.log4j.net.SyslogAppender

 # The syslog daemon resides on www.abc.net
 log4j.appender.A1.SyslogHost=www.abc.net

 # A1's layout is a PatternLayout, using the conversion pattern
 # %r %-5p %c{2} %M.%L %x - %m\n. Thus, the log output will
 # include # the relative time since the start of the application in
 # milliseconds, followed by the level of the log request,
 # followed by the two rightmost components of the logger name,
 # followed by the callers method name, followed by the line number,
 # the nested disgnostic context and finally the message itself.
 # Refer to the documentation of PatternLayout for further information
 # on the syntax of the ConversionPattern key.
 log4j.appender.A1.layout=org.apache.log4j.PatternLayout
 log4j.appender.A1.layout.ConversionPattern=%-4r %-5p %c{2} %M.%L %x - %m\n

 # Set options for appender named "A2"
 # A2 should be a RollingFileAppender, with maximum file size of 10 MB
 # using at most one backup file. A2's layout is TTCC, using the
 # ISO8061 date format with context printing enabled.
 log4j.appender.A2=org.apache.log4j.RollingFileAppender
 log4j.appender.A2.MaxFileSize=10MB
 log4j.appender.A2.MaxBackupIndex=1
 log4j.appender.A2.layout=org.apache.log4j.TTCCLayout
 log4j.appender.A2.layout.ContextPrinting=enabled
 log4j.appender.A2.layout.DateFormat=ISO8601

 # Root logger set to DEBUG using the A2 appender defined above.
 log4j.rootLogger=DEBUG, A2

 # Logger definitions:
 # The SECURITY logger inherits is level from root. However, it's output
 # will go to A1 appender defined above. It's additivity is non-cumulative.
 log4j.logger.SECURITY=INHERIT, A1
 log4j.additivity.SECURITY=false

 # Only warnings or above will be logged for the logger "SECURITY.access".
 # Output will go to A1.
 log4j.logger.SECURITY.access=WARN


 # The logger "class.of.the.day" inherits its level from the
 # logger hierarchy.  Output will go to the appender's of the root
 # logger, A2 in this case.
 log4j.logger.class.of.the.day=INHERIT
 
```
    Refer to the setOption method in each Appender and Layout for class specific options.
    Use the # or ! characters at the beginning of a line for comments.
    Parameters:
    
    configFileName - The name of the configuration file where the configuration information is stored.
  - configure
```
public static void configure(String configFilename)
```
  - configure
```
public static void configure(URL configURL)
```
    Read configuration options from url configURL.
    
    Since:
    
    0.8.2
  - configure
```
public static void configure(InputStream inputStream)
```
    Reads configuration options from an InputStream.
    
    Since:
    
    1.2.17
  - configure
```
public static void configure(Properties properties)
```
    Read configuration options from properties.
    See doConfigure(String, LoggerRepository) for the expected format.
  - configureAndWatch
```
public static void configureAndWatch(String configFilename)
```
    Like configureAndWatch(String, long) except that the default delay as defined by FileWatchdog.DEFAULT_DELAY is used.
    
    Parameters:
    
    configFilename - A file in key=value format.
  - configureAndWatch
```
public static void configureAndWatch(String configFilename,
                                     long delay)
```
    Read the configuration file configFilename if it exists. Moreover, a thread will be created that will periodically check if configFilename has been created or modified. The period is determined by the delay argument. If a change or file creation is detected, then configFilename is read to configure log4j.
    
    Parameters:
    
    configFilename - A file in key=value format.
    
    delay - The delay in milliseconds to wait between each check.
  - doConfigure
```
public void doConfigure(Properties properties,
                        LoggerRepository hierarchy)
```
    Read configuration options from properties.
    See doConfigure(String, LoggerRepository) for the expected format.
  - doConfigure
```
public void doConfigure(InputStream inputStream,
                        LoggerRepository hierarchy)
```
    Read configuration options from url configURL.
    
    Specified by:
    
    doConfigure in interface Configurator
    
    Parameters:
    
    inputStream - The InputStream to parse
    
    hierarchy - The hierarchy to operation upon.
    
    Since:
    
    1.2.17
  - doConfigure
```
public void doConfigure(URL configURL,
                        LoggerRepository hierarchy)
```
    Read configuration options from url configURL.
    
    Specified by:
    
    doConfigure in interface Configurator
    
    Parameters:
    
    configURL - The URL to parse
    
    hierarchy - The hierarchy to operation upon.
  - configureLoggerFactory
```
protected void configureLoggerFactory(Properties props)
```
    Check the provided Properties object for a LoggerFactory entry specified by LOGGER_FACTORY_KEY. If such an entry exists, an attempt is made to create an instance using the default constructor. This instance is used for subsequent Category creations within this configurator.
    
    See Also:
    
    parseCatsAndRenderers(java.util.Properties, org.apache.log4j.spi.LoggerRepository)
  - parseCatsAndRenderers
```
protected void parseCatsAndRenderers(Properties props,
                                     LoggerRepository hierarchy)
```
    Parse non-root elements, such non-root categories and renderers.

Class PropertyConfigurator

Field Summary

Fields inherited from interface org.apache.log4j.spi.Configurator

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

registry

loggerFactory

LOGGER_FACTORY_KEY

Constructor Detail

PropertyConfigurator

Method Detail

doConfigure

Repository-wide threshold

Appender configuration

Configuring loggers

ObjectRenderers

ThrowableRenderer

Logger Factories

Resetting Hierarchy

Example

configure

configure

configure

configure

configureAndWatch

configureAndWatch

doConfigure

doConfigure

doConfigure

configureLoggerFactory

parseCatsAndRenderers