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The BillingDetails class is mapped as an entity. Its discriminator, identifier, and name properties are value typed, and we use the built-in Hibernate mapping types to specify the conversion strategy. It isn t often necessary to explicitly specify a built-in mapping type in the XML mapping document. For instance, if you have a property of Java type java.lang.String, Hibernate discovers this using reflection and selects string by default. We can easily simplify the previous mapping example:

> ant -verbose Apache Ant version 1.5alpha compiled on February 1 2002 Buildfile: build.xml Detected Java version: 1.4 in: /usr/java/j2sdk1.4.0/jre Detected OS: Linux parsing buildfile /home/ant/Projects/firstbuild/build.xml with URI = file:/home/ant/Projects/firstbuild/build.xml Project base dir set to: /home/ant/Projects/firstbuild Build sequence for target `compile is [compile] Complete build sequence is [compile] compile: [javac] Main.java omitted as /home/ant/Projects/firstbuild/Main.class is up to date. [javac] build.xml skipped - don t know how to handle it [javac] Main.class skipped - don t know how to handle it [echo] compilation complete! BUILD SUCCESSFUL Total time: 1 second

<class name="BillingDetails" table="BILLING_DETAILS"> <id name="id" column="BILLING_DETAILS_ID"> <generator class="native"/> </id> <discriminator type="character" column="BILLING_DETAILS_TYPE"/> <property name="number"/> .... </class>

For this build, the most interesting lines are those generated by the <javac> task. It shows two things. First, the task has decided not to recompile Main.java, because it has determined that the destination class is up to date. The task not only includes source files without needing to know their names, it can determine the name and location of the generated class file and, based on simple timestamp checking, decide whether or not to recompile the files. All this is provided in the single line of the build file, <javac srcdir="." />, which is a lot of functionality for twenty characters. The second finding is that the task explicitly skipped the build file, and the generated Main.class bytecode file. This shows that the task looks at all files in the current directory, but because it only knows how to compile Java source files, files without a .java extension are ignored. What is the login verbose mode if Ant compiled the source file Delete Main.class then run Ant again to see. The core part of the output provides detail on the compilation process:

Hibernate also understands type="java.lang.String"; it doesn t have to use reflection then. The most important case where this approach doesn t work well is a java.util.Date property. By default, Hibernate interprets a java.util.Date as a timestamp mapping. You need to explicitly specify type="time" or type="date" if you don t wish to persist both date and time information. With JPA annotations, the mapping type of a property is automatically detected, just like in Hibernate. For a java.util.Date or java.util.Calendar property, the Java Persistence standard requires that you select the precision with a @Temporal annotation:

@Temporal(TemporalType.TIMESTAMP) @Column(nullable = false, updatable = false) private Date startDate;

compile: [javac] Main.java added as /home/ant/Projects/firstbuild/Main.class doesn t exist. [javac] build.xml skipped don t know how to handle it [javac] Compiling 1 source file [javac] Using modern compiler [javac] Compilation args: -classpath /home/ant/Java/jakarta-ant/lib/jaxp.jar: /home/ant/Java/jakarta-ant/lib/crimson.jar: /home/ant/Java/jakarta-ant/lib/ant.jar: /usr/java/j2sdk1.4.0/lib/tools.jar -sourcepath /home/ant/Projects/firstbuild -g:none

On the other hand, Hibernate Annotations, relaxing the rules of the standard, defaults to TemporalType.TIMESTAMP options are TemporalType.TIME and TemporalType.DATE. In other rare cases, you may want to add the @org.hibernate.annotations.Type annotation to a property and declare the name of a built-in or custom Hibernate mapping type explicitly. This is a much more common extension as soon as you start writing your own custom mapping types, which you ll do later in this chapter. The equivalent JPA XML descriptor is as follows:

[javac] File to be compiled: /home/ant/Projects/firstbuild/Main.java [echo] compilation complete! BUILD SUCCESSFUL

<entity class="auction.model.Item" access="FIELD"> <attributes> ... <basic name="startDate"> <column nullable="false" updatable="false"/> <temporal>TIMESTAMP</temporal> </basic> </attributes> </entity>