image extension working on hpcloud, virtualbox and aws-ec2, cloudservers...

... implemented but has issues

image extension is working well on aws-ec2 and virtualbox, on hpcloud the live test often passes but sometimes fails. On cloud servers I'm running into this issue:

FAILED: testCreateImage
org.jclouds.http.HttpResponseException: command: GET https://servers.api.rackspacecloud.com/v1.0/687096/images/detail?format=json HTTP/1.1 failed with response: HTTP/1.1 500 Internal Server Error; content: [{"cloudServersFault":{"message":"Could not send Message.","details":"javax.xml.ws.soap.SOAPFaultException: Could not send Message.","code":500}}]
	at org.jclouds.cloudservers.handlers.ParseCloudServersErrorFromHttpResponse.handleError(ParseCloudServersErrorFromHttpResponse.java:76)
	at org.jclouds.http.handlers.DelegatingErrorHandler.handleError(DelegatingErrorHandler.java:71)
	at org.jclouds.http.internal.BaseHttpCommandExecutorService$HttpResponseCallable.shouldContinue(BaseHttpCommandExecutorService.java:194)
	at org.jclouds.http.internal.BaseHttpCommandExecutorService$HttpResponseCallable.call(BaseHttpCommandExecutorService.java:164)
	at org.jclouds.http.internal.BaseHttpCommandExecutorService$HttpResponseCallable.call(BaseHttpCommandExecutorService.java:1)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:680)
	at org.jclouds.concurrent.config.ExecutorServiceModule$DescribingExecutorService.submit(ExecutorServiceModule.java:182)
	at org.jclouds.http.internal.BaseHttpCommandExecutorService.submit(BaseHttpCommandExecutorService.java:129)
	at org.jclouds.http.TransformingHttpCommandExecutorServiceImpl.submit(TransformingHttpCommandExecutorServiceImpl.java:54)
	at org.jclouds.http.TransformingHttpCommandImpl.execute(TransformingHttpCommandImpl.java:73)
	at org.jclouds.rest.internal.AsyncRestClientProxy.createListenableFutureForHttpRequestMappedToMethodAndArgs(AsyncRestClientProxy.java:248)
	at org.jclouds.rest.internal.AsyncRestClientProxy.invoke(AsyncRestClientProxy.java:148)
	at $Proxy79.listImages(Unknown Source)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.jclouds.concurrent.internal.SyncProxy.invoke(SyncProxy.java:159)
	at $Proxy80.listImages(Unknown Source)
	at org.jclouds.cloudservers.compute.strategy.CloudServersComputeServiceAdapter.listImages(CloudServersComputeServiceAdapter.java:76)
	at org.jclouds.compute.config.ComputeServiceAdapterContextModule$2.get(ComputeServiceAdapterContextModule.java:116)
	at org.jclouds.compute.config.ComputeServiceAdapterContextModule$2.get(ComputeServiceAdapterContextModule.java:1)
	at org.jclouds.collect.TransformingSetSupplier.get(TransformingSetSupplier.java:47)
	at org.jclouds.collect.TransformingSetSupplier.get(TransformingSetSupplier.java:1)
	at org.jclouds.compute.config.BaseComputeServiceContextModule$9.get(BaseComputeServiceContextModule.java:247)
	at org.jclouds.compute.config.BaseComputeServiceContextModule$9.get(BaseComputeServiceContextModule.java:1)
	at org.jclouds.rest.suppliers.SetAndThrowAuthorizationExceptionSupplier.get(SetAndThrowAuthorizationExceptionSupplier.java:49)
	at org.jclouds.concurrent.RetryOnTimeOutExceptionSupplier.get(RetryOnTimeOutExceptionSupplier.java:47)
	at org.jclouds.util.Suppliers2$ExpiringMemoizingSupplier.get(Suppliers2.java:130)
	at org.jclouds.rest.suppliers.MemoizedRetryOnTimeOutButNotOnAuthorizationExceptionSupplier.get(MemoizedRetryOnTimeOutButNotOnAuthorizationExceptionSupplier.java:64)
	at org.jclouds.compute.domain.internal.TemplateBuilderImpl.getImages(TemplateBuilderImpl.java:737)
	at org.jclouds.compute.domain.internal.TemplateBuilderImpl.build(TemplateBuilderImpl.java:612)
	at org.jclouds.compute.domain.internal.TemplateBuilderImpl.build(TemplateBuilderImpl.java:606)
	at org.jclouds.compute.internal.BaseImageExtensionLiveTest.getNodeTemplate(BaseImageExtensionLiveTest.java:68)
	at org.jclouds.compute.internal.BaseImageExtensionLiveTest.testCreateImage(BaseImageExtensionLiveTest.java:100)

please review & advise.