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DEBUG [testMethod] Writing statement 1 DEBUG [testMethod] Writing statement 2
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The conversion pattern value is composed of a set of conversion specifiers and any literal text you want. A conversion specifier starts with a % followed by an optional format modifier and then a conversion character. Format modifiers control spacing, justification, and so forth, and conversion characters specify the data to include with the message. In this example, the conversion pattern %5p [%t] %m%n translates to Logger level [thread name] message\n. Table 8.1 lists the possible conversion characters available to the PatternLayout class. Table 8.1 shows you the data that log4j can add to the final message formatted by the PatternLayout class. Table 8.2 describes how you can format the individual pieces of data. This table contains several examples of formatting the message data (represented by m).
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Formatting log messages
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Table 8.1 All possible conversion characters for the PatternLayout class. Each character represents a piece of data that can be included in the conversion pattern. These characters allow you to add important information to the final form of the log message. Character c C d Description Outputs the name of the logger sending the message. Can be used with {} to substring logger names. Outputs the fully qualified classname containing the message. Can be used with {} to substring the classname. Outputs a timestamp for the logging event. Specify the format using {}. By default, ISO8601 format is used. Additionally, you can specify log4j formatters using ABSOLUTE, DATE, or ISO8601. Outputs the filename of where the message was coded. Outputs location information for the logging event. This varies by JVM implementation, but consists of a fully qualified classname, source filename, and line number. Outputs the line number where the message was coded. Outputs the message. Outputs the method name of the occurrence. Outputs a line separator for the execution platform. Outputs the priority of the logging event. Outputs the elapsed time since the start of the application (in milliseconds). Outputs the thread name of the logging event. Outputs the nested diagnostic context associated with the thread. Outputs the mapped diagnostic context associated with a thread. Must be used with {} specifying a client number. Use %% to output a single % character.
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f l L m M n p r t x X %
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Table 8.2 Examples of formatting conversion characters. These are examples of applied formatting to the previous conversion characters. Each example uses the conversion character m. Character %5m %-5m %.5m Description The message (m) must be at least 5 characters long. To ensure this, the formatter will pad to the left if necessary. The message (m) must be at least 5 characters long. To ensure this, the formatter will pad to the right if necessary. The message (m) should be a maximum of 5 characters long. If necessary, the formatter will truncate it to 5 characters.
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When formatting messages, you can combine format modifiers. For example, the modifier %10.50c adds padding to the left of the logger name if it contains fewer than 10 characters, and truncates it if it s longer than 50 characters.
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8.2 Improving logging performance
8.2 Improving logging performance
Problem
You want to enhance the performance of your logging system.
Background
You have added logging code to your entire EJB application, but now you ve noticed a performance degradation. Logging can affect the performance of your application in a number of ways. log4j is probably the fastest logger you can find, but depending on how you use it, you can hurt your application performance. The two most common areas that affect performance are the number of log messages and the construction of log messages.
Recipe
There are four ways to improve the log4j performance:
s s s s
Adjust the logger level. Construct your messages economically. Use formatting with caution. Use a fast appender layout class.
Change the level of your loggers A large application might have thousands of log messages of varying levels. Modify your logging configuration file to output only the absolutely necessary messages into your logs. Disabling messages will improve the overall performance of your application. For example, if you have tested your application in production, you might want to turn off the debugging statements that are no longer necessary.
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