Oracla Java Installation / Licensing

Community General Discussion
1

Hello everyone, I am looking for more information on the installed version of Java.
More specifically I am looking into an installation of Arduino 1.8.9.
According to the release notes, 1.8.9 was published on 2019-03-15: (https://www.arduino.cc/en/software/ReleaseNotes)
According to the Oracle Java (JDK) release notes, the licensing-critical Version 8 Update 211 was released on 2019-04-16:
(https://www.java.com/releases/)
Is anyone able to confirm the definite version of Oracle Java coming with Arduino 1.8.9?
Thank you in advance.

Best Regards, Tom

2

java (JDK) in itself is not installed by the IDE (IIRC it comes with a JRE)

3

Let's see; on Windows

  1. Take the current download link for the Windows ZIP file: https://downloads.arduino.cc/arduino-1.8.19-windows.zip
  2. Change that to 1.8.9 and download it: https://downloads.arduino.cc/arduino-1.8.9-windows.zip
  3. Open that ZIP file, and drill into the java/lib directory: C:\Users\whoami\Downloads\arduino-1.8.9-windows.zip\arduino-1.8.9\java\lib
  4. Extract rt.jar (the Java RunTime); one way is by dragging it to a directory in the left column, like Documents
  5. Switch to that directory, and rename the file to rt.zip (a JAR is a specialized ZIP)
  6. Open that file, and drill into the META-INF directory
  7. Extract MANIFEST.MF to the same directory
  8. Open that file with Notepad (Just Once)
  9. Check the Implementation-Version
Manifest-Version: 1.0
Implementation-Vendor: Oracle Corporation
Implementation-Title: Java Runtime Environment
Implementation-Version: 1.8.0_191

Searching for java 1.8.0_191 yields Java™ SE Development Kit 8, Update 191 Release Notes (oracle.com)

4

Note that if you move to 2.x, there is no need for Java anymore.

5

just what I needed as I only have limited access to the installation. Thank you very much, kenb4!

6

correct, Arduino switched to AdoptOpen JDK from 2.0 and on

7

IDE 2 is written in typescript and javascript