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Getting started with Ant is difficult: you do not know exactly what to expect, and there are a few complex steps to go through. The error messages do not make sense, and if you file a bug report on the issue tracking web site, a WORKSFORME response is reasonably likely. This is where you discover that a consequence of free, open source software is that nobody staffs the support lines but you and people like you. Because Ant does work fine on most systems, any installation that does not work is almost always due to some configuration issue with the local machine. Something is missing, something is misconfigured, or some other piece of software is interfering with Ant. Just before this book went to press, a -diagnostics command-line switch was added to display diagnostic information about an Ant installation, such as Ant s ant.jar and optional.jar version numbers, whether all tasks defined are actually present in the JAR files, system properties, and ANT_HOME/lib JAR information. This output may help to determine the caues of any installation or configuration problems. Problem: Java not installed/configured If Java is missing, then Ant does not work. Test: Run java from the command line; if this is not a known command then either Java is not installed or the path is wrong. Fix: Install the JDK; set up JAVA_HOME to point to the install location.

Hibernate has some useful methods that can help you test and tune your cache. Consider the global configuration switch for the second-level cache, hibernate. cache.use_second_level_cache. By default, any <cache> element in your mapping files (or in hibernate.cfg.xml, or an annotation) triggers the second-level cache and loads the cache provider at startup. If you want to disable the second-level cache globally without removing the cache mapping elements or annotations, set this configuration property to false. Just as the Session and EntityManager provide methods for controlling the persistence context first-level cache programmatically, so does the SessionFactory for the second-level cache. In a JPA application, you have to get access to the underlying internal SessionFactory, as described in chapter 2, section 2.2.4, Switching to Hibernate interfaces. You can call evict() to remove an element from the second-level cache by specifying the class and the object identifier value:

SessionFactory.evict( Category.class, new Long(123) );

Problem: JDK not installed/configured Ant needs to find the JDK so that it can use classes in tools.jar, such as the Java compiler. Without this, some Ant tasks will fail with class not found exceptions. The environment variable JAVA_HOME is used to find the JDK if it is not set, Ant will warn you on startup with an error message:

You may also evict all elements of a certain class or only evict a particular collection role by specifying a region name:

This may just be a warning, but it is a warning that some tasks will not work properly More insidiously, if JAVA_HOME is wrong, Ant will not notice until some tasks fail, usually <javac> and <javadoc> Test 1: Run javac from the command line; if this is not a known command then either Java is not installed or the path is wrong Test 2: Use set or setenv to verify that the environment variable JAVA_HOME exists Verify that the file toolsjar can be found in the subdirectory JAVA_HOME /lib Fix: Install the JDK; set up JAVA_HOME to point to the install location Problem: Ant not on the path Ant is started by a platform-dependent batch file or shell script, or by a portable script in a language such as Perl or Python.

SessionFactory.evict("auction.model.Category");

If the path does not include Ant s bin directory, these scripts are not found and so Ant cannot start Test: Run ant -version from the command line: a version number and build time should appear If the command interpreter complains that ant is unknown, then the path is wrong If the error is that the Java command is unknown, then the problem is actually with the Java installation, covered earlier Fix: Modify the environment path variable to include the Ant scripts, log out, reboot or otherwise reload the environment to have the change applied Problem: Another version of Ant is on the path Because there are few restrictions on Ant redistribution, and because it is so popular, other Java products sometimes include a version of Ant Tomcat has done this in the past Having a separate version of Ant on the path is problematic for a number of reasons.

You ll rarely need these control mechanisms. Also note that eviction of the second-level cache is nontransactional, that is, the cache region isn t locked during eviction. Hibernate also offers CacheMode options that can be activated for a particular Session. Imagine that you want to insert many objects into the database in one Session. You need to do this in batches, to avoid memory exhaustion every object is added to the first-level cache. However, it s also added to the second-level cache, if enabled for the entity class. A CacheMode controls the interaction of Hibernate with the second-level cache: