Temporary and Permanent Java Version Changes If one of the commands does not activate the expected Java version, please check if the path in the javaX.bat and javaX.ps1 files corresponds to the installation path of the Java version you want to activate. To be able to call the scripts from anywhere, you have to add the directory to the "Path" environment variable (just like you did with "%JAVA_HOME%\bin" in the second step): This only affects the currently opened command line.) Step 4: Add the Script Directory to the Path (The Path variable gets longer with each change. That makes it the first directory to be searched for the corresponding executable when you run Java commands such as java or javac. The scripts update the JAVA_HOME environment variable and insert the bin directory at the beginning of the Path variable. In the files javaX.bat and javaX.ps1, you probably have to adjust some paths to the installed Java versions. $env:Path = $env:JAVA_HOME '\bin ' $env:Path Write-Output " $javaVersion activated." Code language: PowerShell ( powershell ) ::SetEnvironmentVariable( "JAVA_HOME", $env:JAVA_HOME, ::Machine) Set Path= %JAVA_HOME%\bin %Path% echo %~ 1 activated. If % 1 = "Java 20" set JAVA_HOME=C:\Program Files\Java\jdk- 20 if % 1 = "Java 21" set JAVA_HOME=C:\Program Files\Java\jdk- 21 if "%~ 2" = "perm" ( 3" set JAVA_HOME=C:\Program Files (x86)\Java\jdk1. 2" set JAVA_HOME=C:\Program Files (x86)\Java\jdk1. I suggest you unpack the scripts to C:\Program Files\Java\scripts.Ĭall javaX "Java 20" % 1 Code language: DOS. plus two common scripts javaX.bat and javaX.ps1.the corresponding files java21.ps1, java20.ps1, etc.java21.bat, java20.bat, java19.bat, etc., for all Java versions,.Here is the link: scripts-up-to-java21.zip To change the Java version on the command line, I have prepared some batch files that you can copy to your system. The fastest way to change the environment variables is to press the Windows key and type "env" – Windows then offers "Edit the system environment variables" as a search result:Ĭheck your Java version with "cmd" Step 3: Install the Scripts to Change the Java Version The Java installers create various environment variables, which you need to clean up first (see below). Manually Setting the Java Environment Variables Some programs, such as Eclipse, define the Java version in a separate configuration file (for Eclipse, for example, this is the entry "-vm" in the eclipse.ini file). These variables should always point to the same Java installation to avoid inconsistencies. Path – is used when running a Java binary (such as java and javac) from the console.
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