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- The build file was written for a later version of Ant Fix: upgrade to at least the latest release version of Ant - The task is not an Ant core or optional task and needs to be declared using <taskdef>. Remember that for JAR files to be visible to ant tasks implemented in ANT_HOME/lib, the files must be in the same directory or on the classpath Please do not file bug reports on this problem, nor email the ant mailing lists, until all of these causes have been explored, as this is not an Ant bug.

On the other hand, if you re happy to use save() and update() explicitly instead of saveOrUpdate(), Hibernate doesn t have to distinguish between transient and detached instances you do this by selecting the right method to call. (This issue is, in practice, the only reason to not use saveOrUpdate() all the time, by the way.) Mapping natural primary keys with JPA annotations is straightforward:

Whenever Ant fails to build, the BUILD FAILED message appears a message that will hopefully not be too familiar. Usually it is associated with Java source errors or unit test failures, but build file syntax problems result in the same failure message, accompanied by some informative text. If you do get an error, don t worry. Nothing drastic will happen, files won t be deleted (not in this example, anyway!) and you can try to correct the error by looking at the line of XML named, as well as the lines on either side of the error. If your editor has good XML support, the editor itself will point out any XML language errors, leaving the command line to find only Ant-specific errors. Editors that are Ant-aware or validate against an Ant DTD will also catch many Ant-specific syntax errors. An XML editor would also catch the omission of an ending tag from an XML element, such as forgetting to terminate the target element:

@Id private String username;

< xml version="1.0" > <project name="firstbuild" default="compile" > <target name="compile"> <javac srcdir="." /> <echo>compilation complete!</echo> </project>

If no identifier generator is declared, Hibernate assumes that it has to apply the regular select-to-determine-state-unless-versioned strategy and expects the application to take care of the primary key value assignment. You can again avoid the SELECT by extending your application with an interceptor or by adding a versioncontrol property (version number or timestamp). Composite natural keys extend on the same ideas.

Mapping a composite natural key Suppose that the primary key of the USERS table consists of a USERNAME and DEPARTMENT_NR. You can add a property named departmentNr to the User class and create the following mapping:

The error here would come from the XML parser:

<class name="User" table="USERS"> <composite-id> <key-property name="username" column="USERNAME"/> <key-property name="departmentNr" column="DEPARTMENT_NR"/> </composite-id> ... </class>

C:\AntBook\gettingstarted\xml-error.xml:6: Expected "</target>" to terminate element starting on line 3.

The code to save a new User looks like this:

Well laid out build files, formatted for readability, help to make such errors visible. One error we still encounter regularly comes from having an attribute that isn t valid for that task. Spelling the srcdir attribute as sourcedir is an example of this:

User user = new User(); // Assign a primary key value user.setUsername("johndoe"); user.setDepartmentNr(42); // Set property values user.setFirstname("John"); user.setLastname("Doe"); session.saveOrUpdate(user); session.flush();

If the build file contains that line, you would see this error message:

Again, keep in mind that Hibernate executes a SELECT to determine what saveOrUpdate() should do unless you enable versioning control or a custom Interceptor. But what object can/should you use as the identifier when you call load() or get() Well, it s possible to use an instance of the User class, for example:

User user = new User(); // Assign a primary key value user.setUsername("johndoe"); user.setDepartmentNr(42); // Load the persistent state into user session.load(User.class, user);

compile: BUILD FAILED C:\AntBook\gettingstarted\build.xml:4: The <javac> task doesn t support the "sourcedir" attribute.

In this code snippet, User acts as its own identifier class. It s more elegant to define a separate composite identifier class that declares just the key properties. Call this class UserId: