DATACMNS-1722 - More defensive lookup of XmlBeamHttpMessageConverter.

We now avoid a type reference to XmlBeamHttpMessageConverter in a field within SpringDataWebConfiguration to avoid a type reference to a potentially unresolvable type. This seems to have caused issues on certain JDK 14 builds [0].

[0] spring-projects/spring-framework#25050

Author: odrotbohm

src/main/java/org/springframework/data/web/config/SpringDataWebConfiguration.java

@@ -65,7 +65,6 @@ public class SpringDataWebConfiguration implements WebMvcConfigurer, BeanClassLo
 
 	private @Autowired Optional<PageableHandlerMethodArgumentResolverCustomizer> pageableResolverCustomizer;
 	private @Autowired Optional<SortHandlerMethodArgumentResolverCustomizer> sortResolverCustomizer;
-	private @Autowired Optional<XmlBeamHttpMessageConverter> xmlBeamHttpMessageConverter;
 
 	public SpringDataWebConfiguration(ApplicationContext context,
 			@Qualifier("mvcConversionService") ObjectFactory<ConversionService> conversionService) {
@@ -168,7 +167,9 @@ public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
 		}
 
 		if (ClassUtils.isPresent("org.xmlbeam.XBProjector", context.getClassLoader())) {
-			converters.add(0, xmlBeamHttpMessageConverter.orElseGet(() -> new XmlBeamHttpMessageConverter()));
+
+			converters.add(0, context.getBeanProvider(XmlBeamHttpMessageConverter.class) //
+					.getIfAvailable(() -> new XmlBeamHttpMessageConverter()));
 		}
 	}