Issue with PyCharm and RubyMine, JRE folder?

Question

The PyCharm and RubyMine IDE's comes with a folder named JRE in the root installation dir, the JRE folder increments the size of the installation around 150 MB, well, I supposse that this folder just contains exactlly the same java runtime environment that an official JRE installer downloaded from Java.com installs, so my question is:

If I've previouslly installed JRE from Java site I can delete forever the JRE folder from PyCharm and/or RubyMine installation directories to reduce the total size?

I've tried to delete the JRE folder from PyCharm and RubyMine root directories to test whether the IDE's really depends from that folder and seems that both IDE's works as normally with the JRE folder deleted, but I need to be sure that is safe or not to delete the JRE folder from Pychar/RubyMine directories if I currentlly have JRE installed.

Answer 1

IDE comes with it's own version of JRE on Windows.

You can easily configure your environment to use your system wide or any custom JRE (and then delete bundled one if so desired). Just check .bat file in INSTALL_FOLDER\bin folder and see what environment variables and in what order it uses when searching for JRE.

By overriding one of them (IDE-specific one has priority) you can point to a desired JRE installation.