How to install OpenJDK 11 on Windows?

问题

In the past, Oracle used to publish an executable installers for Windows that would:

Unpack files
Add registry keys indicating the installed version and path
Add the JRE to the system PATH
Register an uninstaller with Windows.

As of Java 11, the Oracle's free version of Java (Oracle OpenJDK) doesn't seem to include an installer. It is just a zip file containing the binaries.

How are we supposed to install OpenJDK 11 on Windows seeing as the aforementioned integrations are no longer there? Aren't they necessary?

回答1:

Extract the zip file into a folder, e.g. C:\Program Files\Java\ and it will create a jdk-11 folder (where the bin folder is a direct sub-folder). You may need Administrator privileges to extract the zip file to this location.
Set a PATH:
- Select Control Panel and then System.
- Click Advanced and then Environment Variables.
- Add the location of the bin folder of the JDK installation to the PATH variable in System Variables.
- The following is a typical value for the PATH variable: C:\WINDOWS\system32;C:\WINDOWS;"C:\Program Files\Java\jdk-11\bin"
Set JAVA_HOME:
- Under System Variables, click New.
- Enter the variable name as JAVA_HOME.
- Enter the variable value as the installation path of the JDK (without the bin sub-folder).
- Click OK.
- Click Apply Changes.
Configure the JDK in your IDE (e.g. IntelliJ or Eclipse).

You are set.

To see if it worked, open up the Command Prompt and type java -version and see if it prints your newly installed JDK.

If you want to uninstall - just undo the above steps.

Note: You can also point JAVA_HOME to the folder of your JDK installations and then set the PATH variable to %JAVA_HOME%\bin. So when you want to change the JDK you change only the JAVA_HOME variable and leave PATH as it is.

回答2:

AdoptOpenJDK is a new website hosted by the java community. You can find .msi installers for OpenJDK 8 through 12 there, which will perform all the things listed in the question (Unpacking, registry keys, PATH variable updating (and JAVA_HOME), uninstaller...).

回答3:

From the comment by @ZhekaKozlov: ojdkbuild has OpenJDK builds (currently 8 and 11) for Windows (zip and msi).

回答4:

Use the Chocolatey packet manager. It's a command-line tool similar to npm. Once you have installed it, use

choco install openjdk

in an elevated command prompt to install OpenJDK.

To update an installed version to the latest version, type

choco upgrade openjdk

Pretty simple to use and especially helpful to upgrade to the latest version. No manual fiddling with path environment variables.

回答5:

Oracle Java uninstaller doesn't remove all files.
Check if "C:\ProgramData\Oracle" exists, there is some java files in subdirectory. (ex: java.exe, javaw.exe)
Remove it to prevent executing wrong java files.

来源：https://stackoverflow.com/questions/52511778/how-to-install-openjdk-11-on-windows

标签

windows

java-11