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This message indicates that the task description contained an invalid attribute. Usually this means whoever created the build file typed something wrong, but could mean that the file s author wrote it for a later version of Ant, one with newer attributes or tasks than the version doing the build. That can be hard to fix without upgrading; sometimes a workaround isn t always possible. It is rare that an upgrade would be incompatible or detrimental to your existing build file; such an upgrade is not anything to fear, since the Ant 1.x product line maintains strict backwards compatibility. The error you are likely to see often in Ant is not caused by an error in the build file; rather, it is the build halting after the compiler failed to compile your code. If, for example, someone forgot the semicolon after the println call, a compiler error message would appear, followed by build failure information:

public class UserId implements Serializable { private String username;

Buildfile: build.xml compile: [javac] Compiling 1 source file [javac] /home/ant/Projects/firstbuild/Main.java:5: ';' expected [javac] System.out.println("hello, world") [javac] ^ [javac] 1 error BUILD FAILED /home/ant/Projects/firstbuild/build.xml:4: Compile failed, messages should have been provided. Total time: 4 seconds

The CaveatEmptor example application POJO design for rich domain models Object/relational mapping metadata options

The Hello World example in the previous chapter introduced you to Hibernate; however, it isn t useful for understanding the requirements of real-world applications with complex data models For the rest of the book, we use a much more sophisticated example application CaveatEmptor, an online auction system to demonstrate Hibernate and Java Persistence We start our discussion of the application by introducing a programming model for persistent classes Designing and implementing the persistent classes is a multistep process that we ll examine in detail First, you ll learn how to identify the business entities of a problem domain You create a conceptual model of these entities and their attributes, called a domain model, and you implement it in Java by creating persistent classes.

The build failed on the same line as the previous example error, line four, but this time it did the correct action. The compiler found something wrong, printed out its messages, and notified Ant of the error, which promptly stopped the build. When you get compiler error messages, the line of the XML file is usually unimportant. The name of the Java file and the location within it, along with the compiler error, are the messages that matter. The key point to note is that failure of a task will usually result in the build itself failing. This is essential for a successful build process: there is no point packaging or delivering a project if it did not compile. Ant enforces the rule that failure of a single task halts the entire build.2 2.4.2 Looking at the build in more detail If the build does actually succeed, then the only evidence of this is the message that compilation was successful. Let s run the task again, this time in verbose mode, to see what happens. Ant produces a verbose log when invoked with the -verbose parameter. This is a very useful feature when figuring out what a build file does. For our simple build file, it doubles the amount of text printed:

We spend some time exploring exactly what these Java classes should look like, and we also look at the persistence capabilities of the classes, and how this aspect influences the design and implementation We then explore mapping metadata options the ways you can tell Hibernate how your persistent classes and their properties relate to database tables and columns This can involve writing XML documents that are eventually deployed along with the compiled Java classes and are read by Hibernate at runtime Another option is to use JDK 50 metadata annotations, based on the EJB 30 standard, directly in the Java source code of the persistent classes After reading this chapter, you ll know how to design the persistent parts of your domain model in complex real-world projects, and what mapping metadata option you ll primarily prefer and use.

As well as declaring the packages or files to document, you must point to the source and provide a classpath to the libraries used in the application If the task cannot resolve references to objects used by classes it documents, it prints out warnings and the documentation ends up incomplete To avoid this, we pass the task the same classpath as we used for the compilation, using the classpathref attribute By placing the <javadoc> task in a target that depends upon the compilation succeeding, we know this classpath is valid and all the source actually compiles If you are making a public release that doesn t expose all the internal methods of a library or application, a separate documentation build could be made that only includes the public methods and hides the author details.