CHAPTER 2 Starting a project
true The generated code of the toString() method in Message.java looks like this: public String toString() { StringBuffer buffer = new StringBuffer(); buffer.append(getClass().getName()) .append(”@”) .append( Integer.toHexString(hashCode()) ) .append(” [”); .append(”text”).append(”=’”).append(getText()).append(”‘ “); .append(”]”); return buffer.toString(); } Meta-attributes can be inherited; that is, if you declare a use-in-tostring at the level of a element, all properties of that class are included in the toString() method. This inheritance mechanism works for all hbm2java metaattributes, but you can turn it off selectively: public abstract Setting inherit to false in the scope-class meta-attribute creates only the parent class of this element as public abstract, but not any of the (possibly) nested subclasses. The hbm2java exporter supports, at the time of writing, 17 meta-attributes for fine-tuning code generation. Most are related to visibility, interface implementation, class extension, and predefined Javadoc comments. Refer to the Hibernate Tools documentation for a complete list. If you use JDK 5.0, you can switch to automatically generated static imports and generics with the jdk5=”true” setting on the task. Or, you can produce EJB 3.0 entity classes with annotations. Generating Java Persistence entity classes Normally, you use either Hibernate XML mapping files or JPA annotations in your entity class source code to define your mapping metadata, so generating Java Persistence entity classes with annotations from XML mapping files doesn t seem reasonable. However, you can create entity class source code with annotations directly from JDBC metadata, and skip the XML mapping step. Look at the following Ant target:
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