IT:AD:Java:HowTo:Install [Notes]

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# IT:AD:Java:HowTo:Install #



<callout type="Navigation" class="small">

* [[../|(UP)]]
* See also:
    * [[IT/AD/Powershell/HowTo/Snippets/Work with Environment Variables]]
    * [[IT/AD/PowerShell/HowTo/Snippets/Refresh Environment Variables]]
    * [[IT/AD/Environment Variables/HowTo/Tips Regarding PATH]]


</callout>


<panel title="Summary">



</panel>


## Process ##

#### Download the Right Version

Consider downloading and using the Java 32 bit version from:
* https://java.com/en/download/manual.jsp
    * *Note:I know 64 is hot -- but [[IT/AD/Jenkins/]] and others rely on the 32 bit version.*



#### Install it to the right directory.

Personally, I override the default installation location and set it to:

<sxh>
c:\Program Files (x86)\Java\Current\
</sxh>

When it's finished installing I do *copy* the dir to a folder that lists the version.

<sxh>
c:\Program Files (x86)\Java\vxxxx\
</sxh>

The reason I do this is so that I don't have to update all the various places that might point to it, such as the `PATH` variable (see below).

#### Know something about Environment Variables First ####

<wrap tip>
You'll be surprised by how tricky setting a Service Account's Environment Variables can get:
* [[IT/AD/Environment Variables/HowTo/Tips Regarding PATH]]

Notice especially the unintuitive nature of setting Local User Environment Variables...
</wrap>


#### Set the JAVA_HOME Environment Variable ####

A huge amount of Java applications originally designed for Linux environments rely on finding the `JAVA_HOME` *System* [[IT/AD/Environment Variables/]]

Set it from the command line:

<sxh>
# As An Administrator, due to /m switch:
SETX JAVA_HOME "C:\Program Files (x86)\Java\Current" /m
</sxh>



#### PATH 
Ensure the path to the Bin directory is in the `PATH` [[IT/AD/Environment Variables/]].

You may find that there is already something like the following within the System *PATH*:

<sxh>
C:\ProgramData\Oracle\Java\javapath;
</sxh>

which indirectly points back to `C:\Program Files (x86)\Java\Current\java.exe`


But if it's not there, since you just defined `JAVA_HOME`, you can Append to `PATH` the following:

<sxh>
`%JAVA_HOME%\bin\`
</sxh>

As per [[IT/AD/Powershell/HowTo/Snippets/Work with Environment Variables]]:

<sxh powershell>
function AddPathToPATHEnvironmentVariable([string]$path, [string]$pattern, [string]$scope="Machine"){
  if (!$pattern){
	$pattern = $path;
  }
  if (!$Env:path.ToLower().Contains($pattern.ToLower()))
  {
    $tmpPath = [Environment]:: GetEnvironmentVariable("Path",$scope);
    [Environment]:: SetEnvironmentVariable("Path", $tmpPath + ";"+ $path, $scope)
	return $true;
  }
  return $false;
}
</sxh>




#### Check the Installation

As per [[IT/AD/Java/HowTo/Check that Java is correctly installed]]:

<sxh>
java -version
</sxh>