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There are several third-party tasks that stand out and deserve coverage. Unfortunately, we do not have the space to do justice to them all. Here are a few of our favorites.

Criteria API for query by criteria (QBC) and query by example (QBE):

Checkstyle Do you catch yourself day-dreaming about a warm tropical island beach, gentle breeze blowing, and your source code devoid of hard tabs We do! Bringing up the topic of coding standards is often followed by heated dead-end discussions on where curly brackets should go. This is serious business, and seeing two senior developers duke it out over whether public member variables are allowed is not a pretty sight. Because the authors take coding standards seriously2 and even more seriously the desire to shift work to the build process and off of the people, our build is integrated with a style-checking task. Checkstyle is currently a SourceForge-hosted project, delivering a stand-alone command-line tool and an Ant task. It has the capability to check the following, and more:

session.createCriteria(Category.class) .add( Restrictions.like("name", "Laptop%") );

Unused and duplicate import statements Proper and preferred Javadoc tag usage License header in all modules Preferred placement of curly brackets Existence of tabs Line length maximum Naming conventions for classes, methods, and variables Java Language Specification recommended modifier ordering

Direct SQL with or without automatic mapping of resultsets to objects:

Hey, we re human, too, so be gentle on us if we inadvertently miss adhering to our own strict standards. If we address issues reported by Checkstyle, however, we ll catch most mistakes. CHAPTER 1 0

session.createSQLQuery( "select {c.*} from CATEGORY {c} where NAME like 'Laptop%'" ).addEntity("c", Category.class);

A query must be prepared in application code before execution. So, querying involves several distinct steps:

If the variable contains a string that is mistaken for the name of the Java class to run as the main class, then a different error appears:

Create the query, with any arbitrary restriction or projection of data that you want to retrieve. Bind runtime arguments to query parameters; the query can be reused with changing settings. Execute the prepared query against the database and retrieval of data. You can control how the query is executed and how data should be retrieved into memory (all at once or piecemeal, for example).

Test: Examine ANT_OPTS and verify that the variable is unset or contains valid JVM options. Fix: Correct or clear the variable. If the cause still cannot be found, a useful next step is to edit the Ant invocation scripts to provide more debugging information. In the case of the Windows batch file, commenting out the first line (@echo off ) gives a detailed trace of the file. The Perl script has a debug flag that can be set to get some debug information from the Ant invocation route.

Hibernate and Java Persistence offer query interfaces and methods on these interfaces to prepare and execute arbitrary data retrieval operations.

Because Ant uses XML as the means of describing what to build, creating Ant build files by hand forces you to understand a bit about XML. XML can get very complex, once you get into the details of parsing, XML namespaces, schemas, Java support issues, and indeed the whole politics of XML implementations. Very little of that is relevant to Ant, so here is a brief description of basic XML, which is sufficient for writing build files. XML provides a way of representing structured data that is intelligible to both humans and programs. It is not the easiest of representations for either party, but it lets humans create structured files that machines can understand. Since it looks like HTML, it is not too hard to read or write once you have learned it. An XML document should begin with an XML prolog, which indicates the version and optionally the character set of the XML file here the string < xml version="1.0" >. XML (and therefore Ant) supports different character sets, including Unicode documents in the UTF-8 encoding, which can be useful in international applications. Applications can validate XML documents against another document describing what is valid inside it: a Document Type Description (DTD) or an XML Schema. There is no DTD for Ant, because it can add support for new XML elements during the execution of a build. It is, however, possible to generate or download a somewhat inaccurate DTD to describe Ant build files for use in XML editors. 532