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Tip: Should Log Instances Be Static or Not?

See why it is a good idea to store the log instance in a static final variable.


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Private static final Log log = LogFactory.getLog(MyClass.class);

It is a good idea to store the log instance in a static final variable, because:

  • No problems with serializable classes
  • Initialization cost only once: getLog() may not be as cheap as you might think
  • Automatically thread-safe, only if the final keyword is included
  • Usable from static and non-static code

 

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Octavia Andreea Anghel is a senior PHP developer currently working as a primary trainer for programming teams that participate at national and international software-development contests. She consults on developing educational projects at a national level. She is a coauthor of the book "XML Technologies--XML in Java" (Albastra, ISBN 978-973-650-210-1), for which she wrote the XML portions. In addition to PHP and XML, she's interested in software architecture, web services, UML, and high-performance unit tests.
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