Can't install JDK 9 because “Another Java installation is in progress”

Question

I have been using JDK 9 on Windows 10 x64 for a while but when I went to install the latest early release (b174), I first uninstalled the previous version (as usual) and then ra

Answer 1

On Windows, Java prevents starting the Installer twice by creating (two) lock files. If those files exist, Java Installer show the Message: "Another Java installation is in progress (...)".

If Java Installer crashes, or Windows crashes during Java Installation, the installer cannot delete the lock files when finalizing.

Solution:

Deleting the lock files, unlocks the Installer and Java can be installed again.

The lock files are located at:

C:\ProgramData\Oracle\Java\JAVA_INSTALL_FLAG
%USERPROFILE%\AppData\LocalLow\Sun\Java\JAVA_INSTALL_FLAG
%USERPROFILE%\AppData\LocalLow\Oracle\Java\JAVA_INSTALL_FLAG