A common task in any programming language is Reading and Writing files. Below are a couple of functions that can be used for these purposes, along with descriptions of their use. Be sure to import java.io for these functions to work.
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Sending an email Programmatically using Java
This article will describe how you can send emails pragmatically using the Java programming language. The example below includes a function you can use for easily sending emails from your Java application. Prerequisites If you have not already, be sure you download and install the latest Java Development Kit (JDK). You can find the download …
Virtual machine(s) invalid in vCenter
Sometimes virtual machines within your VMWare environment may show up as invalid. The machine is in-fact still running at this point; but you are unable to manage the virtual machine. This can happen for a few reasons, but in my experience the most common is when the esx host is unable to access the storage.
I have seen this caused by high latency when accessing an NFS datastore, when you leave an offline datastore mounted for an extended period, and I have also seen this happen when a SAN controller failover event occurs.
This condition happens when the esx host cannot access the vmx file (vmware configuration file) in the datastore, so VMWare just sort of forgets the configuration of the machine. The process which runs the virtual machine is still running on the host, so your VM does not crash. But, you still need to recover since HA, DRS, etc… no longer work when the VM is in this state.
Scripting Basics
Scripting is a very useful skill which will save any Sysadmin a lot of time. Who wants to go to every device in their environment and perform the same task over and over again? In this posting I will cover a few basics for those getting started in scripting.