[#setup]
The easiest JDK to install is Eclipse's Adoptium project (formerly AdoptOpenJDK).
Validate JAVA_HOME on Windows
To echo the JAVA_HOME variable in the command prompt, issue the following command:
C:\>echo %JAVA_HOME%
C:\_tools\jdk-17\
PowerShell command to echo JAVA_HOME
The command to echo JAVA_HOME in Windows Powershell is as follows:
PS C:\> echo $env:JAVA_HOME
C:\_tools\jdk-17\
Confirm the Java PATH configuration
After validation of JAVA_HOME, Java’s PATH setting should be confirmed.
As with JAVA_HOME, the Windows PATH setting can be echoed at the command line. Issue the following command to view the PATH in a command prompt:
C:\>echo %PATH%
C:\_tools\jdk-17\bin; C:\WINDOWS\system32; C:\WINDOWS;
The following commands outputs the Windows PATH in PowerShell:
PS C:\> echo $env:PATH
C:\_tools\jdk-17\bin; C:\WINDOWS\system32; C:\WINDOWS;
If the full path to the bin folder of the JDK install is listed, then the Windows PATH for Java has been configured correctly.
The final step to confirm the Java install on Windows was a success is to actually run a Java command and see if it works.
The easiest way to do this is to ask the JDK which version of Java is installed. In PowerShell it looks like this:
PS C:\> java -version
openjdk version "17.0.3" 2022-04-19
OpenJDK Runtime Environment Temurin-17.0.3+7 (build 17.0.3+7)
OpenJDK 64-Bit Server VM Temurin-17.0.3+7 (build 17.0.3+7, mixed mode, sharing)
As you can see, we have successfully setup and installed Java 17 on Windows.