Dec 15, 2016 This article shows you how to define custom annotations for attributes in generated hibernate source code. To define custom annotation for hibernate code generation: Right click on the association role (which eventually will become an attribute) and select Owned By target class. At my company we've been working in a large project using Hibernate 2.x. And we use massive custom ID generators. But I've found (too late) that custom ID generator often isn't a good Idea, at least in our project. Why not use a SEQUENCE or an IDENTITY column? It's easy to maintain and you can use in multiple servers.
Reference Guide
JPA 2 defines a new typesafe
Criteria API which allows criteria queries to be constructed in a strongly-typed manner, using metamodel objects to provide type safety. For developers it is important that the task of the metamodel generation can be automated. Hibernate Static Metamodel Generator is an annotation processor based on the [Pluggable Annotation Processing API] with the task of creating JPA 2 static metamodel classes. The following example show two JPA 2 entities Order and Item , together with the metamodel class Order_ and a typesafe query.
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The structure of the metamodel classes is described in the [JPA 2 Specification], but for completeness the definition is repeated in the following paragraphs. Feel free to skip ahead to Chapter 2, Usage if you are not interested into the gory details.
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The annotation processor produces for every managed class in the persistence unit a metamodel class based on these rules:
Import statements must be included for the needed
javax.persistence.metamodel types as appropriate and all classes X , Y , Z , and K .
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The jar file for the annotation processor can be found in the JBoss Maven repository using Example 2.1, “Maven dependency ”.
Alternatively, a full distribution package can be downloaded from SourceForge.
In most cases the annotation processor will automatically run provided the processor jar is added to the classpath and a JDK 6 is used. This happens due to Java's Service Provider contract and the fact the the Hibernate Static Metamodel Generator jar files contains the file
javax.annotation.processing.Processor in the META-INF/services directory. The fully qualified name of the processor itself is: org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor .
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The use of a Java 6 compiler is a prerequisite.
As mentioned before, the annotation processor will run automatically each time the Java compiler is called, provided the jar file is on the classpath. Sometimes, however, it is useful to control the annotation processing in more detail, for example if you exclusively want to run the processor without compiling any other source files. Example 2.2, “Javac Task configuration” shows how Ant's Javac Task can be configured to just run annotation processing.
The option -proc:only instructs the compiler to just run the annotation processing. You can also completely disable processing by specifying -proc:none.
Tip
Run
'javac -help' to see which other annotation processor relevant options can be specified.
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The maven-compiler-plugin approach has the disadvantage that the maven compiler plugin does currently not allow to specify multiple compiler arguments (MCOMPILER-62) and that messages from the Messenger API are suppressed (MCOMPILER-66). A better approach is to disable annotation processing for the compiler plugin as seen in Example 2.4, “Maven compiler plugin configuration - indirect execution”.
Once disabled, the maven-annotation-plugin for annotation processing (you will need the following additional maven repositories: maven-annotation-plugin and jfrog) can be used. The configuration can be seen in Example 2.5, “Configuration with maven-annotation-plugin”.
Netbeans support for annotation processors is at the time of this wrinting still in the making. Refer to NetBeans issues 111065, 111293 and 111294.
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For further usage question or problems consult the Hibernate Forum. For bug reports use the METAGEN project in the Hibernate Jira instance. Feedback is always welcome.
[Pluggable Annotation Processing API] JSR 269: Pluggable Annotation Processing API. Copyright © 2006 SUN MICROSYSTEMS, INC.
< [email protected]> JSR 269 JCP Page .
[JPA 2 Specification] JSR 317: Java™ Persistence API, Version 2.0 . Java Persistence 2.0 Expert Group. . Copyright © 2009 SUN MICROSYSTEMS, INC.
< [email protected]> JSR 317 JCP Page .
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