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java.util.logging Example

In this article, we will discuss about the logging functionality in Java. Logging in simple words refers to the recording of an application activity. Logging is used to store exceptions, information, and warnings as messages that occur during the execution of a program. Logging helps a programmer in the debugging process of a program. Java provides logging facility in the java.util.logging ...

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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 ...

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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 ...

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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 ...

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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 ...

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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 ...

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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 ...

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Set size threshold of log file

This is an example of how to set size threshold of a log file. Setting size threshold of a log file implies that you should: Create a Logger instance for a class, with the getLogger(String name) API method. Create a FileHandler with a specific file size. It can be configured to write to one or more files, to a specific ...

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Use of logger console handler

In this example we shall show you how to use a logger’s ConsoleHandler. The ConsoleHandler is a handler that takes logs from a Logger and publishes them to System.err. To use the ConsoleHandler one should perform the following steps: Create a Logger instance, with the getLogger(String name) API method of the Logger. Create a ConsoleHandler for System.err. Add the handler ...

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Set logger log level

With this example we are going to demonstrate how to set a Logger‘s log level. The Level defines a set of standard logging levels that can be used to control logging output. The standard levels are provided at the Level API. In short, to set logger log level you should: Create a new Logger instance. Set the log level to ...

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