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Return codes are governed by a simple set of rules: If failonerror is true, then 0 is the only legal return code you can capture in a property. Other return codes ensure that the task fails. If failonerror is false and fork is false, then 0 is the only legal return code you can capture in a property. Other return codes ensure that the task fails because the build s JVM exits on an error return code. If failonerror is false and fork is true, then you can capture the return code. You can nest a number of elements in the <java> task; some replace attributes, some apply only to forked JVMs, and some pass arguments to the JVM. I ll discuss the latter first. You can nest <arg> elements to send arguments to the class you are running or nested <jvmarg> elements to send arguments to a forked JVM. They both take the same attributes (see Table 7-3). You can specify only one at a time. Table 7-3. The <arg> and <jvmarg> Elements Attributes

The saying there s no free lunch is well-suited to parallel programming; Visual Studio 2010 and .NET 4 make the processes easier to develop and debug, but it still by no means easy. Let s discuss some of the potential problem areas that we might encounter while developing parallel code.

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The name of a file to pass on the command line. This will be converted to an absolute filename. A list of command-line arguments, separated by spaces. Ant cannot guarantee that the list you supply will be the same as the list it gives to the java command. Ant splits the line before passing it, which may not be the way you intended it to be split. A pathlike string to pass on the command line. You can use : and ; as separators, though Ant will convert them to the system s default convention. A reference ID to a path defined earlier in the build. Ant treats this path in the same way as the value of the path attribute. A single command-line argument that can contain spaces.

any external configuration file to configure it, then it will automatically inherit and use the properties of the root logger set by the BasicConfigurator.

I Note These potential problems are also common to multithreaded applications, as mentioned previously.

These are other nested elements: <assertions>, which enables Java 1.4 assertions <bootclasspath>, which specifies the boot classpath for this command <classpath>, which specifies the classpath for this command

If you are configuring the logging framework with an external configuration file, you may have to restart the application every time you change the properties file. To avoid this, both the PropertyConfigurator and the DOMConfigurator classes can implement dynamic loading of the configuration file. The following methods demonstrate this in both configuration classes: public void configureAndWatch(String filename, long delay); public void configureAndWatch(String filename);

Deadlocks are the result of two or more sections of code that are waiting for the other to finish; the conditions prevent the sections from ending, effectively locking the application.

<env>, which passes environment variables to the forked JVM <permissions>, which sets security permissions <redirector>, which redirects output <sysproperty>, which allows you to specify system properties for this command <syspropertyset>, which allows you to specify system properties using a property set (see 4) You ll use the <classpath> element here to specify the JAR file that contains your client and the JAR file of the MySQL connector.

These methods use another helper class, org.apache.log4j.helpers.FileWatchDog, that determines if the configuration file exists. If the file exists, it then creates a separate thread and searches for any modification in the file after a specified interval or after a default interval of 60 seconds. If the configuration file is modified, then the Configurator class re-reads the configuration to configure the logging framework. This property becomes very useful in the context of server-based applications, where taking down any Web site may be undesirable, yet you need to change the application s logging configuration. The next section provides an example.

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