Home » logging » Page 2

Tag Archives: logging

Log4j Property Configuration Example

Log4J is an open source project which allows developers output log statements with configured granularity. The configuration can be maintained by the configuration files (XML, Property). Log4J has three main components: Loggers, Appenders and Layouts. These three components work together to help developers configure Log4J to output desired statements in given format and target. The benefit of log statements over simple ...

Read More »

Log4j XML Configuration Example

In this example we will see how to configure Log4j using XML. You can use the property file as well but now  days xml is preferred over property file. Note that unlike Log4j 1.x, the public Log4j 2 API does not expose methods to add, modify or remove appenders and filters or manipulate the configuration in any way. In this example we are ...

Read More »

log4j rootlogger example

In this example we shall talk about the rootlogger, which is a basic component in Log4j. Log4j a thread-safe and flexible logging library for Java, licensed under the Apache Software Foundation. The basic components of the log4j architecture are the loggers, the appenders and the layouts. Loggers are used to log the messages, appenders to publish the messages to different ...

Read More »

log4j properties example

This is an example of how to configure log4j, using the log4j.properties file. Log4j is a logging library for Java, licensed under the Apache Software Foundation. It is a Logging Framework that is thread-safe and flexible, thanks to its configuration. With log4j you can configure logging in runtime, and you can log to different outputs, such as files or even ...

Read More »

Check if message is loggable

This is an example of how to check if a message is loggable. We are going to use a Logger with logging.Level set to WARNING and then log messages in different levels, in order to check if they are loggable. To do so, we have to: Create an instance of Logger, with the getLogger(String name) API method, using as parameter ...

Read More »

Compare Logger Level

In this example we shall show you how to compare Logger Level. The logging Level is used to control logging output. Level objects, such as SEVERE, WARNING and INFO are ordered and specified by ordered integers, so in order to compare them, one should perform the following steps: Use three Level constants. Compare the intValues of each Level constant with ...

Read More »

Prevent the logger send log messages to its parent logger

With this example we are going to demonstrate how to prevent the logger from sending log messages to its parent logger. When a Logger is used, it keeps track of a parent Logger, which is its nearest existing ancestor in the Logger namespace. By default, the logger publishes to its parent’s Handler. To prevent the logger from sending log messages ...

Read More »

Conditional logging

This is an example of how to use Conditional logging. Using conditional logging in a Class means that we check the Level for which the Logger is enabled before we log a message to that level. We have implemented a Class that uses a logger. The Class consists of a simple method that uses the logger to log messages after ...

Read More »

Use Logger MemoryHandler class

In this example we shall show you how to use the Logger MemoryHandler class. The MemoryHandler is a Handler that buffers requests in a circular buffer in memory. To use the MemoryHandler of a logger one should perform the following steps: Create a Logger instance, with the getLogger(String name) API method of the Logger. Initialize a FileHandler to write to ...

Read More »

Log an exception

With this example we are going to demonstrate how to log an exception. In order to do so, we will use a DateFormat and parse a String pattern to create a new Date. In short, to log the ParseException that occurs you should: Create a new SimpleDateFormat with a specific String pattern. Invoke the setLenient(boolean lenient) API method of the ...

Read More »