Archive

Archive for August, 2013

REST API Service Made Easy with Jersey Framework in Java

August 25th, 2013 16 comments

Because REST APIs are easy to get started with, I see more products are adopting it for remote management APIs. To implement the REST on the server side, you can use different programming lanaguages and frameworks. In Java, you can use the Jersey framework which is a reference implementation of the JAX-RS (JSR 311 & JSR 339).

vCenter Orchestrator REST APIs: Executing Workflow

August 12th, 2013 No comments

Just played with vCenter Orchestrator REST APIs and found it’s pretty straight-forward to use. With the REST APIs, you can manage various resources such as workflow, workflow run, workflow presentation, workflow user interaction presentation, catalog, action, package, inventory, action, category, configuration, content, notification, service descriptor, user. It seems possible to build your vCO client like GUI with this set of APIs.

API Documentation Included

Parsing XML in C#: A Quick Working Sample

August 9th, 2013 16 comments

Just started to work on hacking the Web application of vCAC and REST APIs in C#. As expected, the XML processing is an indispensable part for that purpose. I have worked on C# on and off in the past, but never as consistently as on Java. To get myself familiar with the related C# APIs for parsing, I coded the following sample code.

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Categories: Software Development Tags: , ,

Sync up vCenter Server with NTP: Bug and Workaround

August 7th, 2013 No comments

While playing with VMware Single Sign On (SSO) SDK, I got into an exception indicating that the request had expired.

Exception in thread "main" javax.xml.ws.soap.SOAPFaultException: Request has expired
	at com.sun.xml.internal.ws.fault.SOAP11Fault.getProtocolException(SOAP11Fault.java:178)
	at com.sun.xml.internal.ws.fault.SOAPFaultBuilder.createException(SOAPFaultBuilder.java:111)
	at com.sun.xml.internal.ws.client.sei.SyncMethodHandler.invoke(SyncMethodHandler.java:108)
	at com.sun.xml.internal.ws.client.sei.SyncMethodHandler.invoke(SyncMethodHandler.java:78)
	at com.sun.xml.internal.ws.client.sei.SEIStub.invoke(SEIStub.java:107)
	at $Proxy40.issue(Unknown Source)
	at com.vmware.sso.client.samples.AcquireHoKTokenByUserCredentialSample.getToken(AcquireHoKTokenByUserCredentialSample.java:233)
	at com.vmware.sso.client.samples.AcquireHoKTokenByUserCredentialSample.main(AcquireHoKTokenByUserCredentialSample.java:285)

Initially I thought it might be caused by timestamps in the arguments sent to SSO server. But further investigation showed that the time on my vCenter appliance server had run 3 hours faster than normal, so whatever request I had submitted from my desktop (whose time is up to the date) was “thought” to be submitted 3 hours ago. No wonder the request was rejected as expired. I think there is an allowance of a few minutes and 3 hours was just too big to ignore.

Categories: Virtualization Tags: , , ,

Unit Testing with JUnit 4 in Java: Quick Introduction and Simple Samples

August 5th, 2013 1 comment

Unit testing is an important part of software development because it helps capture bugs before it moves on to QA or even customers. However, it’s not part of the end product therefore whatever you invest in unit testing will not yield any direct result but indirect result in better quality of your product. So at one side, you want to do it more for better quality; on the other side, you want to minimize it for less investment. It’s therefore a tricky trade off for best ROI. For more discussion, see here.