Use message in all Assert

This ensures compatibility with Spring 5.

Fixes gh-4193

config/src/main/java/org/springframework/security/config/http/AuthenticationConfigBuilder.java

@@ -481,7 +481,7 @@ final class AuthenticationConfigBuilder {
 							SimpleAttributes2GrantedAuthoritiesMapper.class));
 
 			String roles = jeeElt.getAttribute(ATT_MAPPABLE_ROLES);
-			Assert.state(StringUtils.hasText(roles));
+			Assert.hasLength(roles, "roles is expected to have length");
 			BeanDefinitionBuilder rolesBuilder = BeanDefinitionBuilder
 					.rootBeanDefinition(StringUtils.class);
 			rolesBuilder.addConstructorArgValue(roles);

config/src/main/java/org/springframework/security/config/method/ProtectPointcutPostProcessor.java

@@ -163,7 +163,7 @@ final class ProtectPointcutPostProcessor implements BeanPostProcessor {
 	}
 
 	public void setPointcutMap(Map<String, List<ConfigAttribute>> map) {
-		Assert.notEmpty(map);
+		Assert.notEmpty(map, "configAttributes cannot be empty");
 		for (String expression : map.keySet()) {
 			List<ConfigAttribute> value = map.get(expression);
 			addPointcut(expression, value);