HHH-17157 - Some improvements to the metamodel generator documentation
(cherry picked from commit da522846d8)
This commit is contained in:
Steve Ebersole
parent
4ee3e400a4
commit
9fd2fcfc05
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@ -60,7 +60,7 @@ It also exposes the following method forms:
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==== Static Metamodel Generation
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Static metamodel generation can be incorporated into Gradle builds via the
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annotation processor provided by the `hibernate-jpamodelgen` artifact. Applying
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annotation processor provided by the `org.hibernate.orm:hibernate-jpamodelgen` artifact. Applying
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an annotation processor in Gradle is super easy -
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@ -70,40 +70,3 @@ dependencies {
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annotationProcessor "org.hibernate.orm:hibernate-jpamodelgen:${hibernateVersion}"
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}
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----
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When the build does not need bytecode enhancement support, this is a perfectly valid solution.
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The plugin supports simpler configuration of the generator using the registered
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`jpaMetamodel` extension:
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[source,gradle]
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----
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hibernate {
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jpaMetamodel {
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applyGeneratedAnnotation false
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suppress 'raw'
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generationOutputDirectory "${buildDir}/generated/sources/modelgen"
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compileOutputDirectory "${buildDir}/classes/java/modelgen"
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}
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}
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----
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The extension is of type `JpaMetamodelGenerationSpec`, which exposes the following configuration properties:
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applyGeneratedAnnotation:: Should the `javax.annotation.processing.Generated` annotation be added to the
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generated classes. Defaults to `true`.
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suppressions:: Suppressions to add to the generated classes. Defaults to `['raw', 'deprecation']`
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generationOutputDirectory:: Directory where the generated metamodel classes should be created. Defaults
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to `${buildDir}/generated/sources/jpaMetamodel`
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[[tooling-gradle-modelgen-compile-output]]
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compileOutputDirectory:: Directory where the classes compiled from the generated metamodel classes should be
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created. Defaults to `${buildDir}/classes/java/jpaMetamodel`.
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It also exposes the following method forms:
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* applyGeneratedAnnotation(boolean)
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* suppress(String)
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* generationOutputDirectory(Object)
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* compileOutputDirectory(Object)
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@ -23,7 +23,8 @@ include::extras/maven-example.pom[]
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[[tooling-maven-modelgen]]
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==== Static Metamodel Generation
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The recommended way to integrate the metamodel generation into a maven project is through the annotation processor paths of the maven compiler plugin (roughly equivalent to how the generator is integrated in a gradle project).
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Static metamodel generation should be integrated into a maven project through the annotation processor
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paths of the maven compiler plugin.
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.Integrate the metamodel generator
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====
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@ -6,31 +6,30 @@
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:example-dir-metamodelgen-generated: {testing-project-dir}/target/generated/sources/annotationProcessor/java/main/org/hibernate/testing/orm/domain/userguide
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:core-project-dir: {root-project-dir}/hibernate-core
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:toolingTestsDir: {core-project-dir}/src/test/java/org/hibernate/orm/test/tooling
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:ann-proc: https://docs.oracle.com/en/java/javase/11/tools/javac.html#GUID-082C33A5-CBCA-471A-845E-E77F79B7B049__GUID-3FA757C8-B67B-46BC-AEF9-7C3FFB126A93
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:ann-proc-path: https://docs.oracle.com/en/java/javase/11/tools/javac.html#GUID-AEEC9F07-CB49-4E96-8BC7-BCC2C7F725C9__GUID-214E175F-0F06-4CDC-B511-5BA469955F5A
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:ann-proc-options: https://docs.oracle.com/en/java/javase/11/tools/javac.html#GUID-AEEC9F07-CB49-4E96-8BC7-BCC2C7F725C9__GUID-6CC814A4-8A29-434A-B7E1-DF8234784E7C
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:intg-guide: https://docs.jboss.org/hibernate/orm/6.3/introduction/html_single/Hibernate_Introduction.html#generator
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Jakarta Persistence defines a typesafe Criteria API which allows `Criteria` queries to be constructed in a
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strongly-typed manner, utilizing so-called static metamodel classes. For developers, it is important that
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the task of the metamodel generation can be automated. Hibernate Static Metamodel Generator is an annotation
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processor based on https://jcp.org/en/jsr/detail?id=269[JSR_269] with the task of creating Jakarta Persistence
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static metamodel classes.
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Jakarta Persistence defines a typesafe Criteria API which allows <<criteria,`Criteria`>>
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queries to be constructed in a strongly-typed manner, utilizing so-called static metamodel
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classes. The Hibernate Static Metamodel Generator, available via the published
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`org.hibernate.orm:hibernate-jpamodelgen` artifact, is an link:{ann-proc}[annotation processor]
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used to generate these static metamodel classes.
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See <<criteria>> for discussion of Jakarta Persistence criteria queries.
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[NOTE]
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====
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The Hibernate Static Metamodel Generator has many additional capabilities beyond static metamodel
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class generation. See the link:{intg-guide}[Introduction Guide] for a complete discussion of its
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capabilities. The rest of the discussion here is limited to the Jakarta Persistence static metamodel.
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The Hibernate Static Metamodel Generator is defined by the published `org.hibernate.orm:hibernate-jpamodelgen`
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artifact. As it is defined as an
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https://docs.oracle.com/en/java/javase/11/tools/javac.html#GUID-082C33A5-CBCA-471A-845E-E77F79B7B049[annotation processor],
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it is usable anytime `javac` is used. See the tool-specific discussions (<<tooling-gradle-modelgen,Gradle>>, <<tooling-maven-modelgen,Maven>>
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The generator is expected to be run using the `javac` link:{ann-proc-path}[-processorpath] option.
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See the tool-specific discussions (<<tooling-gradle-modelgen,Gradle>>, <<tooling-maven-modelgen,Maven>>
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and <<tooling-ant,Ant>>) for details on integrating the generator into those environments.
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NOTE:: The fully qualified name of the processor class is `org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor`.
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[TIP]
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====
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The `javac` option _-proc:only_ instructs the compiler to just run the annotation processing.
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You can also disable annotation processing by specifying _-proc:none_.
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Run `'javac -help'` to see which other annotation processor relevant options can be specified.
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====
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[[tooling-modelgen-classes]]
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==== Metamodel classes
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The structure of the metamodel classes is described in the Jakarta Persistence
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specification, but for completeness the definition is repeated in the following
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@ -108,3 +107,18 @@ include::{toolingTestsDir}/modelgen/ModelGenTests.java[tags=tooling-modelgen-usa
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----
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====
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[[tooling-modelgen-options]]
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==== Generation Options
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The Hibernate Static Metamodel Generator accepts a number of configuration options, which are specified as
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part of the `javac` execution using standard link:{ann-proc-options}[-A] options -
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`-Adebug=[true|false]`:: Enables debug logging from the generator.
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`-AfullyAnnotationConfigured=[true|false]`:: Controls whether `orm.xml` mapping should be considered.
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`-ApersistenceXml=[path]`:: Specifies the path to the `persistence.xml` file.
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`-AormXml=[path]`:: Specifies the path to an `orm.xml` file.
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`-AlazyXmlParsing=[true|false]`:: Controls whether the processor should attempt to determine whether any `orm.xml` files have changed.
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`-AaddGeneratedAnnotation=[true|false]`:: Controls whether the processor should add `@jakarta.annotation.Generated` to the generated classes.
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`-addGenerationDate=[true|false]`:: Controls whether the processor should add `@jakarta.annotation.Generated#date`.
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`-addSuppressWarningsAnnotation=[true|false]`:: Controls whether the processor should add `@SuppressWarnings({"deprecation","rawtypes"})` to the generated classes.
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@ -83,13 +83,46 @@ import static org.hibernate.jpamodelgen.util.TypeUtils.toTypeString;
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JPAMetaModelEntityProcessor.ADD_SUPPRESS_WARNINGS_ANNOTATION
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})
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public class JPAMetaModelEntityProcessor extends AbstractProcessor {
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/**
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* Debug logging from the processor
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*/
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public static final String DEBUG_OPTION = "debug";
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/**
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* Path to a {@code persistence.xml} file
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*/
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public static final String PERSISTENCE_XML_OPTION = "persistenceXml";
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/**
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* Path to an {@code orm.xml} file
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*/
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public static final String ORM_XML_OPTION = "ormXml";
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/**
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* Controls whether the processor should consider XML files
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*/
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public static final String FULLY_ANNOTATION_CONFIGURED_OPTION = "fullyAnnotationConfigured";
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/**
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* Controls whether the processor should only load XML files when there have been changes
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*/
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public static final String LAZY_XML_PARSING = "lazyXmlParsing";
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public static final String ADD_GENERATION_DATE = "addGenerationDate";
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/**
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* Whether the {@code jakarta.annotation.Generated} annotation should be added to
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* the generated classes
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*/
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public static final String ADD_GENERATED_ANNOTATION = "addGeneratedAnnotation";
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/**
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* Assuming that {@linkplain #ADD_GENERATED_ANNOTATION} is enabled, this option controls
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* whether {@code @Generated#date} should be populated.
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*/
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public static final String ADD_GENERATION_DATE = "addGenerationDate";
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/**
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* Controls whether {@code @SuppressWarnings({"deprecation","rawtypes"})} should be added to the generated classes
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*/
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public static final String ADD_SUPPRESS_WARNINGS_ANNOTATION = "addSuppressWarningsAnnotation";
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private static final boolean ALLOW_OTHER_PROCESSORS_TO_CLAIM_ANNOTATIONS = false;
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