Relax EntityManagerFactoryBuilder Map generic

Relax the generic signature on EntityManagerFactoryBuilder.properties
so that any object type can be added.

Fixed gh-1376

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

@@ -137,7 +137,7 @@ public class EntityManagerFactoryBuilder {
 		 * @param properties the properties to use
 		 * @return the builder for fluent usage
 		 */
-		public Builder properties(Map<String, String> properties) {
+		public Builder properties(Map<String, ?> properties) {
 			this.properties.putAll(properties);
 			return this;
 		}

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.java

@@ -16,6 +16,7 @@
 
 package org.springframework.boot.autoconfigure.orm.jpa;
 
+import java.util.LinkedHashMap;
 import java.util.Map;
 
 import javax.persistence.EntityManager;
@@ -67,8 +68,10 @@ public class HibernateJpaAutoConfiguration extends JpaBaseConfiguration {
 	}
 
 	@Override
-	protected Map<String, String> getVendorProperties() {
-		return this.properties.getHibernateProperties(this.dataSource);
+	protected Map<String, Object> getVendorProperties() {
+		Map<String, Object> vendorProperties = new LinkedHashMap<String, Object>();
+		vendorProperties.putAll(this.properties.getHibernateProperties(this.dataSource));
+		return vendorProperties;
 	}
 
 	static class HibernateEntityManagerCondition extends SpringBootCondition {

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/orm/jpa/JpaBaseConfiguration.java

@@ -102,14 +102,14 @@ public abstract class JpaBaseConfiguration implements BeanFactoryAware {
 	@Primary
 	@ConditionalOnMissingBean
 	public LocalContainerEntityManagerFactoryBean entityManagerFactory(
-			EntityManagerFactoryBuilder factory) {
-		return factory.dataSource(this.dataSource).packages(getPackagesToScan())
+			EntityManagerFactoryBuilder factoryBuilder) {
+		return factoryBuilder.dataSource(this.dataSource).packages(getPackagesToScan())
 				.properties(getVendorProperties()).build();
 	}
 
 	protected abstract AbstractJpaVendorAdapter createJpaVendorAdapter();
 
-	protected abstract Map<String, String> getVendorProperties();
+	protected abstract Map<String, Object> getVendorProperties();
 
 	protected EntityManagerFactoryBuilder.EntityManagerFactoryBeanCallback getVendorCallback() {
 		return null;