Tagged: metamodel
how to exclude generated jpa metamodels from being javadoc-ed
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<configuration>
<sourceFileExcludes>
<exclude>**/**_.java</exclude>
</sourceFileExcludes>
</configuration>
</plugin>
</plugins>
finding an entity by its unique attribute value.
public static <T extends BaseEntity, Y> Optional<T> findByUniqueAttribute(
final EntityManager entityManager,
final Class<T> entityClass,
final Supplier<SingularAttribute<? super T, Y>> attributeSupplier,
final Supplier<? extends Y> valueSupplier) {
final CriteriaBuilder builder = entityManager.getCriteriaBuilder();
final CriteriaQuery<T> criteria = builder.createQuery(entityClass);
final Root<T> root = criteria.from(entityClass);
criteria.select(root);
criteria.where(builder.equal(root.get(
attributeSupplier.get()), valueSupplier.get()));
try {
return Optional.of(
entityManager.createQuery(criteria).getSingleResult());
} catch (final NoResultException nre) {
return Optional.empty();
}
}
public static <T extends BaseEntity, Y> Optional<T> findByUniqueAttribute2(
@NotNull final EntityManager entityManager,
@NotNull final Class<T> entityClass,
@NotNull final Function<ManagedType<T>, SingularAttribute<? super T, Y>> attributeSupplier,
@NotNull final Supplier<? extends Y> valueSupplier) {
final CriteriaBuilder builder = entityManager.getCriteriaBuilder();
final CriteriaQuery<T> criteria = builder.createQuery(entityClass);
final Root<T> root = criteria.from(entityClass);
criteria.select(root);
criteria.where(builder.equal(
root.get(attributeSupplier.apply(
entityManager.getMetamodel().entity(entityClass))),
valueSupplier.get()));
try {
return Optional.of(
entityManager.createQuery(criteria).getSingleResult());
} catch (final NoResultException nre) {
return Optional.empty();
}
}
jpa-metamodels-with-maven
Sourcecode
$ git clone git@github.com:jinahya/jpa-metamodels-with-maven-example.git $ cd jpa-metamodels-with-maven $ git checkout develop $ mvn help:all-profiles
Hibernate
With direct dependencies
<dependencies>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-jpamodelgen</artifactId>
<scope>compile</scope>
<optional>true</optional>
</dependency>
</dependencies>
Using maven-processor-plugin
<build>
<plugins>
<plugin>
<groupId>org.bsc.maven</groupId>
<artifactId>maven-processor-plugin</artifactId>
<executions>
<execution>
<id>process</id>
<goals>
<goal>process</goal>
</goals>
<phase>generate-sources</phase>
<configuration>
<processors>
<processor>org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor</processor>
</processors>
</configuration>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-jpamodelgen</artifactId>
<version>${hibernate.version}</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
Apache OpenJPA
With direct dependencies
It seems that Apache OpenJPA must be triggered with a specific compiler argument.
<dependencies>
<dependency>
<groupId>org.apache.openjpa</groupId>
<artifactId>openjpa</artifactId>
<scope>compile</scope>
<optional>true</optional>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<compilerArgs>
<arg>-Aopenjpa.metamodel=true</arg>
</compilerArgs>
</configuration>
</plugin>
</plugins>
</build>
Using maven-processor-plugin
Again, Apache OpenJPA requires some additional configuration.
<build>
<plugins>
<plugin>
<groupId>org.bsc.maven</groupId>
<artifactId>maven-processor-plugin</artifactId>
<executions>
<execution>
<id>process</id>
<goals>
<goal>process</goal>
</goals>
<phase>generate-sources</phase>
<configuration>
<processors>
<processor>org.apache.openjpa.persistence.meta.AnnotationProcessor6</processor>
</processors>
<optionMap>
<openjpa.metamodel>true</openjpa.metamodel>
</optionMap>
</configuration>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>org.apache.openjpa</groupId>
<artifactId>openjpa</artifactId>
<version>${openjpa.version}</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
EclipseLink
For EclipseLink, the location of persistence.xml must be specified.
Using direct dependencies
<dependencies>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>org.eclipse.persistence.jpa.modelgen.processor</artifactId>
<scope>compile</scope>
<optional>true</optional>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<compilerArgs>
<arg>-Aeclipselink.persistencexml=src/main/resources/META-INF/persistence.xml</arg>
</compilerArgs>
</configuration>
</plugin>
</plugins>
</build>
Using maven-processor-plugin
<build>
<plugins>
<plugin>
<groupId>org.bsc.maven</groupId>
<artifactId>maven-processor-plugin</artifactId>
<executions>
<execution>
<id>process</id>
<goals>
<goal>process</goal>
</goals>
<phase>generate-sources</phase>
<configuration>
<processors>
<processor>org.eclipse.persistence.internal.jpa.modelgen.CanonicalModelProcessor</processor>
</processors>
<compilerArguments>-Aeclipselink.persistencexml=src/main/resources/META-INF/persistence.xml</compilerArguments>
</configuration>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>org.eclipse.persistence.jpa.modelgen.processor</artifactId>
<version>${eclipselink.version}</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
DataNucleus
Using direct dependencies
When working with DataNucleus, an additional dependency needs to be specified.
<dependencies>
<dependency>
<groupId>org.datanucleus</groupId>
<artifactId>datanucleus-jpa-query</artifactId>
<scope>compile</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.datanucleus</groupId>
<artifactId>datanucleus-core</artifactId>
<version>${datanucleus.version}</version>
<scope>compile</scope>
<optional>true</optional>
</dependency>
</dependencies>
Using maven-processor-plugin
<build>
<plugins>
<plugin>
<groupId>org.bsc.maven</groupId>
<artifactId>maven-processor-plugin</artifactId>
<executions>
<execution>
<id>process</id>
<goals>
<goal>process</goal>
</goals>
<phase>generate-sources</phase>
<configuration>
<processors>
<processor>org.datanucleus.jpa.query.JPACriteriaProcessor</processor>
</processors>
</configuration>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>org.datanucleus</groupId>
<artifactId>datanucleus-jpa-query</artifactId>
<version>${datanucleus.version}</version>
</dependency>
<dependency>
<groupId>org.datanucleus</groupId>
<artifactId>datanucleus-core</artifactId>
<version>${datanucleus.version}</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
jinahya 