Log4j Appender File File For Mac

Log4j provides multiple options to format log files created by the framework. It can create simple log files, xml log files or html log files also.

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There are many ways to log: it can be saved to a file, console (or command prompt), a database, or elsewhere for review. Appender is an object which responsible to display log messages. Two commonly used appenders: ConsoleAppender: to display log messages to the console or command prompt. Hi all we configure the HIVE, and log4j with RollingFileAppender log4j.appender.DRFA=org.apache.log4j.RollingFileAppender log4j.appender.DRFA.MaxBackupIndex=10 log4j.appender.DRFA.MaxFileSize=1KB full details: # Define some default values that can be overridden by system properties hive.log.thresho.

If you want to create your logging information in an HTML formatted file, then you have to use the org.apache.HTMLLayout class to format your logging information.

The HTMLLayout class extends the abstract class, i.e., org.apache.log4j.Layout class and overrides the format() method from its base class to provide HTML style formatting.

HTMLLayout displays the following information:

  • The time elapsed from the start of the application before a particular logging event was generated.
  • The thread name that invoked the logging request.
  • Level associated with this logging request.
  • Name of the logger and logging message.
  • The location information (optional) for the program file and the line number from which this logging was invoked.

HTMLLayout is a very simple object of Layout that provides the following methods:

S. No.MethodDescription
1.setContentType(String)This method is used to set the content type of the text/html HTML content. Default is text/html.
2.setLocationInfo(String)This method is used to set the location information for the logging event. Default is false.
3.setTitle(String)This method is used to set the title for the HTML file. Default is log4j Log Messages.
File

HTMLLayoutExample

Following is the simple configuration file for HTMLLayout:

Log4j.properties:

Following is the Java file which would generate logging information:

HtmlLayoutEx.java

Compile then run the above code. It would create an htmlLayout.html file in C:/usr/home/log4j directory which would have the following log information:

htmlLayout.html

You can use any web browser to open htmlLayout.html file. You can note that the footer for the </html> and </body> tags is completely missing.

One of the biggest advantages of having the log file in HTML format is that it can be published as a web page for remote viewing.


Migrating from Log4j 1.x

Using the Log4j 1.x bridge

Perhaps the simplest way to convert to using Log4j 2 is to replace the log4j 1.x jar file with Log4j 2's log4j-1.2-api.jar. However, to use this successfully applications must meet the following requirements:

  1. They must not access methods and classes internal to the Log4j 1.x implementation such as Appenders, LoggerRepository or Category's callAppenders method.
  2. They must not programmatically configure Log4j.
  3. They must not configure by calling the classes DOMConfigurator or PropertyConfigurator.

Converting to the Log4j 2 API

For the most part, converting from the Log4j 1.x API to Log4j 2 should be fairly simple. Many of the log statements will require no modification. However, where necessary the following changes must be made.

  1. The main package in version 1 is org.apache.log4j, in version 2 it is org.apache.logging.log4j
  2. Calls to org.apache.log4j.Logger.getLogger() must be modified to org.apache.logging.log4j.LogManager.getLogger().
  3. Calls to org.apache.log4j.Logger.getRootLogger() or org.apache.log4j.LogManager.getRootLogger() must be replaced with org.apache.logging.log4j.LogManager.getRootLogger().
  4. Calls to org.apache.log4j.Logger.getLogger that accept a LoggerFactory must remove the org.apache.log4j.spi.LoggerFactory and use one of Log4j 2's other extension mechanisms.
  5. Replace calls to org.apache.log4j.Logger.getEffectiveLevel() with org.apache.logging.log4j.Logger.getLevel().
  6. Remove calls to org.apache.log4j.LogManager.shutdown(), they are not needed in version 2 because the Log4j Core now automatically adds a JVM shutdown hook on start up to perform any Core clean ups.
  7. Calls to org.apache.log4j.Logger.setLevel() or similar methods are not supported in the API. Applications should remove these. Equivalent functionality is provided in the Log4j 2 implementation classes but may leave the application susceptible to changes in Log4j 2 internals.
  8. Where appropriate, applications should convert to use parameterized messages instead of String concatenation.

Configuring Log4j 2

Although the Log4j 2 configuration syntax is different than that of Log4j 1.x, most, if not all, of the same functionality is available. Below are the example configurations for Log4j 1.x and their counterparts in Log4j 2.

Log4j Appender File File For Mac Download

Sample 1 - Simple configuration using a Console Appender

Log4j 1.x XML configuration

Log4j 2 XML configuration

Sample 2 - Simple configuration using a File Appender

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Log4j 1.x XML configuration

Log4j 2 XML configuration

Appender

Sample 3 - SocketAppender

Log4j 1.x XML configuration. This example from Log4j 1.x is misleading. The SocketAppender does not actually use a Layout. Configuring one will have no effect.

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Log4j 2 XML configuration

Sample 4 - AsyncAppender

Log4j 1.x XML configuration using the AsyncAppender.

Log4j 2 XML configuration.

Sample 5 - AsyncAppender with Console and File

Log4j 1.x XML configuration using the AsyncAppender.

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Log4j 2 XML configuration. Note that the Async Appender should be configured after the appenders it references. This will allow it to shutdown properly.