Class ConsoleHandler

java.util.logging.ConsoleHandler

public class ConsoleHandler extends StreamHandler

This Handler publishes log records to System.err. By default the SimpleFormatter is used to generate brief summaries.

Configuration: By default each ConsoleHandler is initialized using the following LogManager configuration properties where <handler-name> refers to the fully-qualified class name of the handler. If properties are not defined (or have invalid values) then the specified default values are used.

<handler-name>.level specifies the default level for the Handler (defaults to Level.INFO).
<handler-name>.filter specifies the name of a Filter class to use (defaults to no Filter).
<handler-name>.formatter specifies the name of a Formatter class to use (defaults to java.util.logging.SimpleFormatter).
<handler-name>.encoding the name of the character set encoding to use (defaults to the default platform encoding).

For example, the properties for ConsoleHandler would be:

java.util.logging.ConsoleHandler.level=INFO
java.util.logging.ConsoleHandler.formatter=java.util.logging.SimpleFormatter

For a custom handler, e.g. com.foo.MyHandler, the properties would be:

com.foo.MyHandler.level=INFO
com.foo.MyHandler.formatter=java.util.logging.SimpleFormatter

Since:: 1.4

Constructor Summary

Constructor	Description
`ConsoleHandler()`	Create a `ConsoleHandler` for `System.err`.

Method Summary

Modifier and Type	Method	Description
`void`	`close()`	Override `StreamHandler.close` to do a flush but not to close the output stream.
`void`	`publish(LogRecord record)`	Publish a `LogRecord`.

Methods declared in class StreamHandler

flush, isLoggable, setEncoding, setOutputStream

Methods declared in class Handler

getEncoding, getErrorManager, getFilter, getFormatter, getLevel, reportError, setErrorManager, setFilter, setFormatter, setLevel

Methods declared in class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ConsoleHandler

public ConsoleHandler()

Create a ConsoleHandler for System.err.

The ConsoleHandler is configured based on LogManager properties (or their default values).

Method Details

publish

public void publish(LogRecord record)

Publish a LogRecord.

The logging request was made initially to a Logger object, which initialized the LogRecord and forwarded it here.

Overrides:: publish in class StreamHandler
Implementation Requirements:: This method is not synchronized, and subclasses must not define overridden publish() methods to be synchronized if they call super.publish() or format user arguments. See the discussion in java.util.logging.Handler for more information.
Parameters:: record - description of the log event. A null record is silently ignored and is not published

close

public void close()

Override StreamHandler.close to do a flush but not to close the output stream. That is, we do not close System.err.

Overrides:: close in class StreamHandler

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https://docs.oracle.com/en/java/javase/25/docs/api/java.logging/java/util/logging/ConsoleHandler.html