How to know what JDK IntelliJ IDEA is using - intellij-idea

Question

I have looked at:
https://intellij-support.jetbrains.com/hc/en-us/articles/206827547-Selecting-the-JDK-version-the-IDE-will-run-under
and
https://intellij-support.jetbrains.com/hc/en-us/articles/206827537-Configuring-JVM-options-and-platform-properties
How can I know what version and path of JDK my IntelliJ IDEA is using?
I have tried setting the environment variable IDEA_JDK.
But I am not sure which version of JDK the IDE is picking up. is there a log I could see to verify this?
System information
IntelliJ-IDEA 15
Windows 7, 64 bit

Answer 1

Please look at the https://intellij-support.jetbrains.com/hc/en-us/articles/206827517-Locating-IDE-log-files to locate the log file which has the command used to start Intellij IDEA
For example, on OSX, ~/Library/Logs/IntelliJIdea15/idea.log has the following:
2015-10-17 16:26:52,339 [ 1086] INFO - #com.intellij.idea.Main - JRE: 1.8.0_40-release-b94 (JetBrains s.r.o)
2015-10-17 16:26:52,339 [ 1086] INFO - #com.intellij.idea.Main - JVM: 25.60-b23 (OpenJDK 64-Bit Server VM)
2015-10-17 16:26:52,378 [ 1125] INFO - #com.intellij.idea.Main - JVM Args: <snip>
If you don't have the Help -> Show log in explorer option, then please search for the file at c:\Users\Auyshman\.IntelliJIdea15\system\log\idea.log
Another alternative is to use Process Explorer and add/enable the column called 'Image Path' to see the complete path of the process for Intellij. This should show the JDK/JRE being used to invoke Intellij as well.

Answer 2

Default locations
On the Mac, the default location is:
/Applications/IntelliJ IDEA <version>.app/Contents/jdk/Contents/Home/jre
On Windows, the default location is:
C:\Program Files\JetBrains\IntelliJ IDEA <version>\jre64
(Does anyone know what the default location is on linux?)
If these default locations do not work, here are two ways to find out the actual location:
Method #1
Go to Settings → Build, Execution, Deployment → Build Tools → Maven → Runner
Open the "JRE:" dropdown list
Select the "Use Internal JRE" entry.
Look at the path. (It will probably be abbreviated, so you will probably have to divine it.)
Method #2
Execute the "Find Action..." action. The default key binding for this action is Ctrl+Shift+A. This brings up a dialog where you can type the name of any action to find it and execute it.
In the dialog that opens, type "Switch" and from the suggested matches select "Switch Boot JDK...". This will execute the "Switch Boot JDK..." action for you, which is not bound to any key by default and it cannot be found in any of the menus.
In the dialog that opens you can see the currently selected "Boot JDK". There is even a button to copy the path to your clipboard.
P.S.
I find it amazing that IntelliJ IDEA does not seem to readily provide this information. Every time I install a new version of IntelliJ IDEA I have to go to the IntelliJ IDEA JRE and execute the keytool to install a certificate into this new JRE so that it can access the internal maven repositories that we use. So, every time this happens, I need to know where the internal JRE is. And I usually have to do it both for the mac at work and for windows at home, which is quite tedious.

Answer 3

JVM version and name (but not path) is visible in the Help->About dialog.