DATACMNS-1224 - Polishing of nullability annotations.

Refactored code to properly check for null fields in Eclipse. Added warning suppressions where suitable.

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

@@ -141,7 +141,7 @@ public class SpringDataWebConfiguration implements WebMvcConfigurer, BeanClassLo
 		argumentResolvers.add(pageableResolver());
 
 		ProxyingHandlerMethodArgumentResolver resolver = new ProxyingHandlerMethodArgumentResolver(
-				getRequiredConversionService());
+				conversionService.getObject());
 		resolver.setBeanFactory(context);
 		forwardBeanClassLoader(resolver);
 
@@ -180,17 +180,6 @@ public class SpringDataWebConfiguration implements WebMvcConfigurer, BeanClassLo
 		sortResolverCustomizer.ifPresent(c -> c.customize(sortResolver));
 	}
 
-	private ConversionService getRequiredConversionService() {
-
-		ConversionService conversionService = this.conversionService.getObject();
-
-		if (conversionService == null) {
-			throw new IllegalStateException("No ConversionService configured!");
-		}
-
-		return conversionService;
-	}
-
 	private void forwardBeanClassLoader(BeanClassLoaderAware target) {
 
 		if (beanClassLoader != null) {

src/main/java/org/springframework/data/web/querydsl/QuerydslPredicateArgumentResolver.java

@@ -90,6 +90,7 @@ public class QuerydslPredicateArgumentResolver implements HandlerMethodArgumentR
 	 * (non-Javadoc)
 	 * @see org.springframework.web.method.support.HandlerMethodArgumentResolver#resolveArgument(org.springframework.core.MethodParameter, org.springframework.web.method.support.ModelAndViewContainer, org.springframework.web.context.request.NativeWebRequest, org.springframework.web.bind.support.WebDataBinderFactory)
 	 */
+	@Nullable
 	@Override
 	public Predicate resolveArgument(MethodParameter parameter, @Nullable ModelAndViewContainer mavContainer,
 			NativeWebRequest webRequest, @Nullable WebDataBinderFactory binderFactory) throws Exception {
@@ -149,6 +150,10 @@ public class QuerydslPredicateArgumentResolver implements HandlerMethodArgumentR
 
 		TypeInformation<?> actualType = source.getActualType();
 
+		if (actualType == null) {
+			throw new IllegalArgumentException(String.format("Could not determine domain type from %s!", source));
+		}
+
 		if (source != actualType) {
 			return detectDomainType(actualType);
 		}