gaul commented on a change in pull request #135:
URL: https://github.com/apache/jclouds/pull/135#discussion_r820088521



##########
File path: core/src/main/java/org/jclouds/ContextBuilder.java
##########
@@ -370,7 +371,11 @@ private Properties currentStateToUnexpandedProperties() {
          defaults.setProperty(PROPERTY_CREDENTIAL, credential);
       if (overrides.isPresent())
          putAllAsString(overrides.get(), defaults);
-      
putAllAsString(propertiesPrefixedWithJcloudsApiOrProviderId(getSystemProperties(),
 apiMetadata.getId(), providerId), defaults);
+      Map<String, Object> system = 
propertiesPrefixedWithJcloudsApiOrProviderId(getSystemProperties(), 
apiMetadata.getId(), providerId);
+      if (Strings.isNullOrEmpty((String) system.get(PROPERTY_ENDPOINT))) {
+         system.remove(PROPERTY_ENDPOINT);

Review comment:
       I don't strongly oppose this but why does the caller set an empty 
string?  Should we check all keys to see if they are empty?  Should we do other 
input validation like checking whether the endpoint is a URL?




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