Add support for configuring additional PersistenceUnitPostProcessor

See gh-47802

Signed-off-by: Lansana DIOMANDE <lansana.diomande@epfedu.fr>

module/spring-boot-hibernate/src/test/java/org/springframework/boot/hibernate/autoconfigure/HibernateJpaAutoConfigurationTests.java

@@ -114,6 +114,7 @@ import org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager
 import org.springframework.orm.jpa.persistenceunit.ManagedClassNameFilter;
 import org.springframework.orm.jpa.persistenceunit.PersistenceManagedTypes;
 import org.springframework.orm.jpa.persistenceunit.PersistenceUnitManager;
+import org.springframework.orm.jpa.persistenceunit.PersistenceUnitPostProcessor;
 import org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter;
 import org.springframework.orm.jpa.support.OpenEntityManagerInViewInterceptor;
 import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
@@ -351,6 +352,19 @@ class HibernateJpaAutoConfigurationTests {
 			});
 	}
 
+	@Test
+	void shouldProcessAllPersistenceUnitPostProcessorsDeclaredAsBeans() {
+		this.contextRunner.withUserConfiguration(TestConfigurationWithMultipleCustomPersistenceUnitPostProcessors.class)
+			.run((context) -> {
+				LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = context
+					.getBean(LocalContainerEntityManagerFactoryBean.class);
+				PersistenceUnitInfo persistenceUnitInfo = entityManagerFactoryBean.getPersistenceUnitInfo();
+				assertThat(persistenceUnitInfo).isNotNull();
+				assertThat(persistenceUnitInfo.getManagedClassNames()).contains(
+						"customized.attribute.converter.class.name", "customized.attribute.converter.class.othername");
+			});
+	}
+
 	@Test
 	void customManagedClassNameFilter() {
 		this.contextRunner.withBean(ManagedClassNameFilter.class, () -> (s) -> !s.endsWith("City"))
@@ -1168,6 +1182,24 @@ class HibernateJpaAutoConfigurationTests {
 
 	}
 
+	@Configuration(proxyBeanMethods = false)
+	@TestAutoConfigurationPackage(HibernateJpaAutoConfigurationTests.class)
+	static class TestConfigurationWithMultipleCustomPersistenceUnitPostProcessors {
+
+		@Bean
+		EntityManagerFactoryBuilderCustomizer entityManagerFactoryBuilderCustomizer() {
+			return (builder) -> builder.addPersistenceUnitPostProcessors(
+					(pui) -> pui.addManagedClassName("customized.attribute.converter.class.name"));
+		}
+
+		@Bean
+		EntityManagerFactoryBuilderCustomizer otherEntityManagerFactoryBuilderCustomizer() {
+			return (builder) -> builder.addPersistenceUnitPostProcessors(
+					(pui) -> pui.addManagedClassName("customized.attribute.converter.class.othername"));
+		}
+
+	}
+
 	static class CustomJpaTransactionManager extends JpaTransactionManager {
 
 	}

module/spring-boot-jpa/src/main/java/org/springframework/boot/jpa/EntityManagerFactoryBuilder.java

@@ -17,9 +17,12 @@
 package org.springframework.boot.jpa;
 
 import java.net.URL;
+import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.LinkedHashMap;
+import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.function.Function;
@@ -129,6 +132,24 @@ public class EntityManagerFactoryBuilder {
 		this.persistenceUnitPostProcessors = persistenceUnitPostProcessors;
 	}
 
+	/**
+	 * Add some {@linkplain PersistenceUnitPostProcessor persistence unit post processors}
+	 * to be applied to the PersistenceUnitInfo used for creating the
+	 * {@link LocalContainerEntityManagerFactoryBean}.
+	 * @param persistenceUnitPostProcessors the persistence unit post processors to use
+	 */
+	public void addPersistenceUnitPostProcessors(PersistenceUnitPostProcessor... persistenceUnitPostProcessors) {
+		if (this.persistenceUnitPostProcessors == null) {
+			this.persistenceUnitPostProcessors = persistenceUnitPostProcessors;
+			return;
+		}
+
+		var combined = new ArrayList<>(Arrays.asList(this.persistenceUnitPostProcessors));
+		combined.addAll(Arrays.asList(persistenceUnitPostProcessors));
+
+		this.persistenceUnitPostProcessors = combined.toArray(PersistenceUnitPostProcessor[]::new);
+	}
+
 	/**
 	 * A fluent builder for a LocalContainerEntityManagerFactoryBean.
 	 */