Allow JSON/XML serialization customization in ORM

- add qualifiers to mark FormatMapper for JSON/XML formatting
- use a Quarkus-configured ObjectMapper if Jackson is present and user did not specify a format mapper
- use a Quarkus-configured Jsonb if Jsonb is present and user did not specify a format mapper

core/deployment/src/main/java/io/quarkus/deployment/Capability.java

@@ -32,10 +32,12 @@ public interface Capability {
     String LRA_PARTICIPANT = QUARKUS_PREFIX + ".lra.participant";
 
     String JACKSON = QUARKUS_PREFIX + ".jackson";
+    String JSONB = QUARKUS_PREFIX + ".jsonb";
 
-    String KOTLIN = QUARKUS_PREFIX + ".kotlin";
+    String JAXB = QUARKUS_PREFIX + ".jaxb";
+    String JAXP = QUARKUS_PREFIX + ".jaxp";
 
-    String JSONB = QUARKUS_PREFIX + ".jsonb";
+    String KOTLIN = QUARKUS_PREFIX + ".kotlin";
 
     String HAL = QUARKUS_PREFIX + ".hal";
 

docs/src/main/asciidoc/hibernate-orm.adoc

@@ -1240,3 +1240,82 @@ to tell Quarkus it should be used in the default persistence unit.
 +
 For <<multiple-persistence-units,named persistence units>>, use `@PersistenceUnitExtension("nameOfYourPU")`
 <2> Implement `org.hibernate.engine.jdbc.spi.StatementInspector`.
+
+[[json_xml_serialization_deserialization]]
+== Customizing JSON/XML serialization/deserialization
+
+By default, Quarkus will try to automatically configure format mappers depending on available extensions.
+Globally configured `ObjectMapper` (or `Jsonb`) will be used for serialization/deserialization operations when Jackson (or JSON-B) is available.
+Jackson will take precedence if both Jackson and JSON-B are available at the same time.
+
+JSON and XML serialization/deserialization in Hibernate ORM can be customized by implementing a `org.hibernate.type.format.FormatMapper`
+and annotating the implementation with the appropriate qualifiers:
+
+[source,java]
+----
+@JsonFormat // <1>
+@PersistenceUnitExtension // <2>
+public class MyJsonFormatMapper implements FormatMapper { // <3>
+    @Override
+    public String inspect(String sql) {
+        // ...
+        return sql;
+    }
+    @Override
+    public <T> T fromString(CharSequence charSequence, JavaType<T> javaType, WrapperOptions wrapperOptions) {
+        // ...
+    }
+
+    @Override
+    public <T> String toString(T value, JavaType<T> javaType, WrapperOptions wrapperOptions) {
+       // ...
+    }
+}
+----
+<1> Annotate the format mapper implementation with the `@JsonFormat` qualifier
+to tell Quarkus that this mapper is specific to JSON serialization/deserialization.
++
+<2> Annotate the format mapper implementation with the `@PersistenceUnitExtension` qualifier
+to tell Quarkus it should be used in the default persistence unit.
++
+For <<multiple-persistence-units,named persistence units>>, use `@PersistenceUnitExtension("nameOfYourPU")`
+<3> Implement `org.hibernate.type.format.FormatMapper`.
+
+In case of a custom XML format mapper, a different CDI qualifier must be applied:
+
+[source,java]
+----
+@XmlFormat // <1>
+@PersistenceUnitExtension // <2>
+public class MyJsonFormatMapper implements FormatMapper { // <3>
+    @Override
+    public String inspect(String sql) {
+        // ...
+        return sql;
+    }
+    @Override
+    public <T> T fromString(CharSequence charSequence, JavaType<T> javaType, WrapperOptions wrapperOptions) {
+        // ...
+    }
+
+    @Override
+    public <T> String toString(T value, JavaType<T> javaType, WrapperOptions wrapperOptions) {
+       // ...
+    }
+}
+----
+<1> Annotate the format mapper implementation with the `@XmlFormat` qualifier
+to tell Quarkus that this mapper is specific to XML serialization/deserialization.
++
+<2> Annotate the format mapper implementation with the `@PersistenceUnitExtension` qualifier
+to tell Quarkus it should be used in the default persistence unit.
++
+For <<multiple-persistence-units,named persistence units>>, use `@PersistenceUnitExtension("nameOfYourPU")`
+<3> Implement `org.hibernate.type.format.FormatMapper`.
+
+[NOTE]
+====
+Format mappers *must* have both `@PersistenceUnitExtension` and either `@JsonFormat` or `@XmlFormat` CDI qualifiers applied.
+
+Having multiple JSON (or XML) format mappers registered for the same persistence unit will result in an exception, because of the ambiguity.
+====

extensions/hibernate-orm/deployment/src/main/java/io/quarkus/hibernate/orm/deployment/ClassNames.java

@@ -57,6 +57,9 @@ private static DotName createConstant(String fqcn) {
 
     public static final DotName INTERCEPTOR = createConstant("org.hibernate.Interceptor");
     public static final DotName STATEMENT_INSPECTOR = createConstant("org.hibernate.resource.jdbc.spi.StatementInspector");
+    public static final DotName FORMAT_MAPPER = createConstant("org.hibernate.type.format.FormatMapper");
+    public static final DotName JSON_FORMAT = createConstant("io.quarkus.hibernate.orm.JsonFormat");
+    public static final DotName XML_FORMAT = createConstant("io.quarkus.hibernate.orm.XmlFormat");
 
     public static final List<DotName> GENERATORS = List.of(
             createConstant("org.hibernate.generator.internal.CurrentTimestampGeneration"),

extensions/hibernate-orm/deployment/src/main/java/io/quarkus/hibernate/orm/deployment/HibernateOrmCdiProcessor.java

@@ -61,7 +61,8 @@ public class HibernateOrmCdiProcessor {
             ClassNames.TENANT_RESOLVER,
             ClassNames.TENANT_CONNECTION_RESOLVER,
             ClassNames.INTERCEPTOR,
-            ClassNames.STATEMENT_INSPECTOR);
+            ClassNames.STATEMENT_INSPECTOR,
+            ClassNames.FORMAT_MAPPER);
 
     @BuildStep
     AnnotationsTransformerBuildItem convertJpaResourceAnnotationsToQualifier(
@@ -247,11 +248,13 @@ void generateDataSourceBeans(HibernateOrmRecorder recorder,
     @BuildStep
     void registerAnnotations(BuildProducer<AdditionalBeanBuildItem> additionalBeans,
             BuildProducer<BeanDefiningAnnotationBuildItem> beanDefiningAnnotations) {
-        // add the @PersistenceUnit and @PersistenceUnitExtension classes
+        // add the @PersistenceUnit, @PersistenceUnitExtension, @JsonFormat and @XmlFormat classes
         // otherwise they won't be registered as qualifiers
         additionalBeans.produce(AdditionalBeanBuildItem.builder()
                 .addBeanClasses(ClassNames.QUARKUS_PERSISTENCE_UNIT.toString(),
-                        ClassNames.PERSISTENCE_UNIT_EXTENSION.toString())
+                        ClassNames.PERSISTENCE_UNIT_EXTENSION.toString(),
+                        ClassNames.JSON_FORMAT.toString(),
+                        ClassNames.XML_FORMAT.toString())
                 .build());
 
         // Register the default scope for @PersistenceUnitExtension and make such beans unremovable by default

extensions/hibernate-orm/deployment/src/main/java/io/quarkus/hibernate/orm/deployment/HibernateOrmProcessor.java

@@ -326,7 +326,7 @@ public void configurationDescriptorBuilding(
                                     hibernateOrmConfig.database.ormCompatibilityVersion, Collections.emptyMap()),
                             null,
                             jpaModel.getXmlMappings(persistenceXmlDescriptorBuildItem.getDescriptor().getName()),
-                            false, true));
+                            false, true, capabilities));
         }
 
         if (impliedPU.shouldGenerateImpliedBlockingPersistenceUnit()) {
@@ -1118,7 +1118,7 @@ private static void producePersistenceUnitDescriptorFromConfig(
                                 persistenceUnitConfig.unsupportedProperties),
                         persistenceUnitConfig.multitenantSchemaDatasource.orElse(null),
                         xmlMappings,
-                        false, false));
+                        false, false, capabilities));
     }
 
     private static void collectDialectConfig(String persistenceUnitName,

extensions/hibernate-orm/deployment/src/main/java/io/quarkus/hibernate/orm/deployment/PersistenceUnitDescriptorBuildItem.java

@@ -2,12 +2,16 @@
 
 import java.util.Collection;
 import java.util.List;
+import java.util.Optional;
 
 import org.hibernate.jpa.boot.internal.ParsedPersistenceXmlDescriptor;
 
 import io.quarkus.builder.item.MultiBuildItem;
+import io.quarkus.deployment.Capabilities;
+import io.quarkus.deployment.Capability;
 import io.quarkus.hibernate.orm.runtime.boot.QuarkusPersistenceUnitDefinition;
 import io.quarkus.hibernate.orm.runtime.boot.xml.RecordableXmlMapping;
+import io.quarkus.hibernate.orm.runtime.customized.FormatMapperKind;
 import io.quarkus.hibernate.orm.runtime.integration.HibernateOrmIntegrationStaticDescriptor;
 import io.quarkus.hibernate.orm.runtime.recording.RecordedConfig;
 
@@ -30,19 +34,23 @@ public final class PersistenceUnitDescriptorBuildItem extends MultiBuildItem {
     private final List<RecordableXmlMapping> xmlMappings;
     private final boolean isReactive;
     private final boolean fromPersistenceXml;
+    private final Optional<FormatMapperKind> jsonMapper;
+    private final Optional<FormatMapperKind> xmlMapper;
 
     public PersistenceUnitDescriptorBuildItem(ParsedPersistenceXmlDescriptor descriptor, String configurationName,
             RecordedConfig config,
             String multiTenancySchemaDataSource,
             List<RecordableXmlMapping> xmlMappings,
-            boolean isReactive, boolean fromPersistenceXml) {
+            boolean isReactive, boolean fromPersistenceXml, Capabilities capabilities) {
         this.descriptor = descriptor;
         this.configurationName = configurationName;
         this.config = config;
         this.multiTenancySchemaDataSource = multiTenancySchemaDataSource;
         this.xmlMappings = xmlMappings;
         this.isReactive = isReactive;
         this.fromPersistenceXml = fromPersistenceXml;
+        this.jsonMapper = json(capabilities);
+        this.xmlMapper = xml(capabilities);
     }
 
     public Collection<String> getManagedClassNames() {
@@ -80,6 +88,23 @@ public boolean isFromPersistenceXml() {
     public QuarkusPersistenceUnitDefinition asOutputPersistenceUnitDefinition(
             List<HibernateOrmIntegrationStaticDescriptor> integrationStaticDescriptors) {
         return new QuarkusPersistenceUnitDefinition(descriptor, configurationName, config,
-                xmlMappings, isReactive, fromPersistenceXml, integrationStaticDescriptors);
+                xmlMappings, isReactive, fromPersistenceXml, jsonMapper, xmlMapper, integrationStaticDescriptors);
+    }
+
+    private Optional<FormatMapperKind> json(Capabilities capabilities) {
+        if (capabilities.isPresent(Capability.JACKSON)) {
+            return Optional.of(FormatMapperKind.JACKSON);
+        }
+        if (capabilities.isPresent(Capability.JSONB)) {
+            return Optional.of(FormatMapperKind.JSONB);
+        }
+        return Optional.empty();
+    }
+
+    private Optional<FormatMapperKind> xml(Capabilities capabilities) {
+        if (capabilities.isPresent(Capability.JAXB)) {
+            return Optional.of(FormatMapperKind.JAXB);
+        }
+        return Optional.empty();
     }
 }

extensions/hibernate-orm/runtime/pom.xml

@@ -143,6 +143,21 @@
             <groupId>io.quarkus</groupId>
             <artifactId>quarkus-caffeine</artifactId>
         </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-jackson</artifactId>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-jsonb</artifactId>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-jaxb</artifactId>
+            <optional>true</optional>
+        </dependency>
     </dependencies>
 
     <build>

extensions/hibernate-orm/runtime/src/main/java/io/quarkus/hibernate/orm/JsonFormat.java

@@ -0,0 +1,37 @@
+package io.quarkus.hibernate.orm;
+
+import static java.lang.annotation.ElementType.FIELD;
+import static java.lang.annotation.ElementType.METHOD;
+import static java.lang.annotation.ElementType.PARAMETER;
+import static java.lang.annotation.ElementType.TYPE;
+import static java.lang.annotation.RetentionPolicy.RUNTIME;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
+import jakarta.enterprise.util.AnnotationLiteral;
+import jakarta.inject.Qualifier;
+
+import org.hibernate.type.format.FormatMapper;
+
+/**
+ * CDI qualifier for beans implementing a {@link FormatMapper}.
+ * <p>
+ * This mapper will be used by Hibernate ORM for serialization and deserialization of JSON properties.
+ * <p>
+ * <strong>Must</strong> be used in a combination with a {@link PersistenceUnitExtension} qualifier to define the persistence
+ * unit the mapper should be associated with.
+ */
+@Target({ TYPE, FIELD, METHOD, PARAMETER })
+@Retention(RUNTIME)
+@Documented
+@Qualifier
+public @interface JsonFormat {
+    class Literal extends AnnotationLiteral<JsonFormat> implements JsonFormat {
+        public static JsonFormat INSTANCE = new Literal();
+
+        private Literal() {
+        }
+    }
+}

extensions/hibernate-orm/runtime/src/main/java/io/quarkus/hibernate/orm/XmlFormat.java

@@ -0,0 +1,37 @@
+package io.quarkus.hibernate.orm;
+
+import static java.lang.annotation.ElementType.FIELD;
+import static java.lang.annotation.ElementType.METHOD;
+import static java.lang.annotation.ElementType.PARAMETER;
+import static java.lang.annotation.ElementType.TYPE;
+import static java.lang.annotation.RetentionPolicy.RUNTIME;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
+import jakarta.enterprise.util.AnnotationLiteral;
+import jakarta.inject.Qualifier;
+
+import org.hibernate.type.format.FormatMapper;
+
+/**
+ * CDI qualifier for beans implementing a {@link FormatMapper}.
+ * <p>
+ * This mapper will be used by Hibernate ORM for serialization and deserialization of XML properties.
+ * <p>
+ * <strong>Must</strong> be used in a combination with a {@link PersistenceUnitExtension} qualifier to define the persistence
+ * unit the mapper should be associated with.
+ */
+@Target({ TYPE, FIELD, METHOD, PARAMETER })
+@Retention(RUNTIME)
+@Documented
+@Qualifier
+public @interface XmlFormat {
+    class Literal extends AnnotationLiteral<XmlFormat> implements XmlFormat {
+        public static XmlFormat INSTANCE = new Literal();
+
+        private Literal() {
+        }
+    }
+}

extensions/hibernate-orm/runtime/src/main/java/io/quarkus/hibernate/orm/runtime/PersistenceUnitUtil.java

@@ -1,5 +1,7 @@
 package io.quarkus.hibernate.orm.runtime;
 
+import java.lang.annotation.Annotation;
+import java.util.Arrays;
 import java.util.Comparator;
 import java.util.Locale;
 
@@ -22,8 +24,10 @@ public static boolean isDefaultPersistenceUnit(String name) {
     }
 
     public static <T> InjectableInstance<T> singleExtensionInstanceForPersistenceUnit(Class<T> beanType,
-            String persistenceUnitName) {
-        InjectableInstance<T> instance = extensionInstanceForPersistenceUnit(beanType, persistenceUnitName);
+            String persistenceUnitName,
+            Annotation... additionalQualifiers) {
+        InjectableInstance<T> instance = extensionInstanceForPersistenceUnit(beanType, persistenceUnitName,
+                additionalQualifiers);
         if (instance.isAmbiguous()) {
             throw new IllegalStateException(String.format(Locale.ROOT,
                     "Multiple instances of %1$s were found for persistence unit %2$s. "
@@ -33,9 +37,15 @@ public static <T> InjectableInstance<T> singleExtensionInstanceForPersistenceUni
         return instance;
     }
 
-    public static <T> InjectableInstance<T> extensionInstanceForPersistenceUnit(Class<T> beanType, String persistenceUnitName) {
-        return Arc.container().select(beanType,
-                new PersistenceUnitExtension.Literal(persistenceUnitName));
+    public static <T> InjectableInstance<T> extensionInstanceForPersistenceUnit(Class<T> beanType, String persistenceUnitName,
+            Annotation... additionalQualifiers) {
+        if (additionalQualifiers.length == 0) {
+            return Arc.container().select(beanType, new PersistenceUnitExtension.Literal(persistenceUnitName));
+        } else {
+            Annotation[] qualifiers = Arrays.copyOf(additionalQualifiers, additionalQualifiers.length + 1);
+            qualifiers[additionalQualifiers.length] = new PersistenceUnitExtension.Literal(persistenceUnitName);
+            return Arc.container().select(beanType, qualifiers);
+        }
     }
 
     public static class PersistenceUnitNameComparator implements Comparator<String> {

extensions/hibernate-orm/runtime/src/main/java/io/quarkus/hibernate/orm/runtime/boot/FastBootEntityManagerFactoryBuilder.java

@@ -30,8 +30,11 @@
 import org.hibernate.tool.schema.spi.CommandAcceptanceException;
 import org.hibernate.tool.schema.spi.DelayedDropRegistryNotAvailableImpl;
 import org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator;
+import org.hibernate.type.format.FormatMapper;
 
 import io.quarkus.arc.InjectableInstance;
+import io.quarkus.hibernate.orm.JsonFormat;
+import io.quarkus.hibernate.orm.XmlFormat;
 import io.quarkus.hibernate.orm.runtime.PersistenceUnitUtil;
 import io.quarkus.hibernate.orm.runtime.RuntimeSettings;
 import io.quarkus.hibernate.orm.runtime.migration.MultiTenancyStrategy;
@@ -211,6 +214,17 @@ protected void populate(String persistenceUnitName, SessionFactoryOptionsBuilder
         if (!statementInspectorInstance.isUnsatisfied()) {
             options.applyStatementInspector(statementInspectorInstance.get());
         }
+
+        InjectableInstance<FormatMapper> jsonFormatMapper = PersistenceUnitUtil.singleExtensionInstanceForPersistenceUnit(
+                FormatMapper.class, persistenceUnitName, JsonFormat.Literal.INSTANCE);
+        if (!jsonFormatMapper.isUnsatisfied()) {
+            options.applyJsonFormatMapper(jsonFormatMapper.get());
+        }
+        InjectableInstance<FormatMapper> xmlFormatMapper = PersistenceUnitUtil.singleExtensionInstanceForPersistenceUnit(
+                FormatMapper.class, persistenceUnitName, XmlFormat.Literal.INSTANCE);
+        if (!xmlFormatMapper.isUnsatisfied()) {
+            options.applyXmlFormatMapper(xmlFormatMapper.get());
+        }
     }
 
     private static class ServiceRegistryCloser implements SessionFactoryObserver {