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Note that if the partition file already exists, the first command overwrites the file using a single greater-than symbol (>), and if the file does not exist, the file is simply created. All subsequent echo statements append their output to the file. With this method, there is the danger of using the incorrect redirect (overwrite > or append >>). As an example, if the last line in the four lines of the code here had a single redirect > instead of a double redirect >>, the output of all the lines previous to the error would be eliminated. Troubleshooting this error is somewhat difficult since both versions work, are very similar in appearance, and differ by only a single character. In contrast, the technique described in this chapter uses the cat utility in a form that is not necessarily intuitive. Instead of echoing lines one at a time, you create the formatted text all at once and then output it to the screen directly using a here-document. Alternatively, you can redirect it to an output file either in append or overwrite mode. This method uses double input-redirect characters (<<), followed by a unique delimiter, in this case SOMETAG, but it could be anything and does not matter if it is all uppercase. The delimiter immediately precedes the preformatted text to mark its start. On the line following the last line of the text, a matching end delimiter is issued to close

The Spring Framework ships with a main spring.jar containing everything you will need. This book and all of its examples will work with version 1.2 or later. You may obtain this JAR, along with the source code, from http://www.springframework.org. If for some reason disk space is a real issue, you may prefer to use the smaller JAR files also packaged with the distribution. These JAR files package each section of the framework individually, offering you the ability to pick and choose which features of the Spring Framework you wish to bundle with the application. If you choose to use the smaller individual JARs, refer to Table 4-1 for the minimum required. Table 4-1. Minimum Module-Specific Required Spring JARs

Change the way you write messages When you re outputting messages, performance is slowed not only by the actual act of logging, but also by the construction of the message. For instance, look at the following sections of code that contain log statements:

the here-document. With this technique, you can create free-format output of as many lines as you like in the exact format you want. Once the here-document is closed, the output stream is terminated and the command completes. This code is functionally the same as the first code segment in this chapter, except that the code has been modified to use cat instead of echo:

ApplicationContext, validation,

//first section public String getValue() { String returnValue = computeValue(); Logger.debug( "Final value of action: " + action + " is " + computeValue() ); return returnValue; }

Compare that code to the following:

WebApplicationContext, MultipartResolver,

cat > $PARTTAB <<SOMETAG # partition table of /dev/hda unit: sectors /dev/hda3 : start=0,size=0,Id=0 /dev/hda4 : start=0,size=0,Id=0 SOMETAG

//second statement public String getValue() { String returnValue = computeValue(); if( logger.isDebugEnabled() ) //check for level enabled { logger.debug("Final value of action " + action + " is " + returnValue ); //reuse computed value } return returnValue; }

web utilities, third-party framework support Framework servlets, Web mvc framework, web controllers, web views

This example is much cleaner and easier to read, since nearly all the echo statements, quotes, and redirection syntax have been removed. Also, commented (#), blank, and quoted lines can be entered without further issues arising, as they won t be evaluated by the shell. Some characters may need to be escaped if you want them to be included in your output. The dollar sign ($) and the back-tick or back-quote (`) need to be escaped with a backslash (\) because otherwise the shell will evaluate them and attempt to use them with their normal meanings. This slight modification of the here-document adds the hyphen (-) following the initial redirection:

The first logging statement incurs the cost of an extra method call to computeValue() and string concatenation for the message even if the DEBUG level of the logging system is disabled. The second statement wisely reuses the returnValue object, and also constructs the log message only if the DEBUG level is enabled. Change your conversion patterns The PatternLayout class and ConversionPattern attribute comprise one of the most common configurations for log4j. However, many of the PatternLayout s formatting options can slow down your application. Table 8.3 lists the conversion characters you should use with caution and really only if performance is not an issue with your application. Change the layout class of an appender Change the layout class to the org.apache.log4j.SimpleLayout class. This layout class produces messages that include only the log level and message of the logging event:

Caution The upcoming release of Spring 2.0 will have a different JAR packaging strategy. To be safe,

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