无法下载JDK 8

Question

I'm trying to setup Unity to build for Android. But I can't get the Java Development Kit. Can't download it and can't find it either.

In this answer , the guy says

To ensure JDK is installed, just go through the following : press Win + R type 'cmd' in the popup and press button OK. in the console which has opened, type javac -version and press enter. You should see as an output : javac 1.8.0_XX If so SDK is installed .

I did that and I got "javac 1.8.0_XX", and so I assumed I had the JDK, so I went to Unity > External Tools > JDK and tried linking the following path: "C:\\Program Files\\Java\\jre1.8.0", and got the error message: "The path you specified does not look like a valid JDK installation. Android development requires at least JDK(1.7), having JRE only is not enough. Please make sure you are selecting a suitable JDK home directory or download and install the latest JDK: link "

I clicked the download link for windows x64 and it never loads and eventually says there's no connection. I tried the x86 as well.

In this SO question How do I find where JDK is installed on my windows machine?

Answer: For windows, in the command prompt:

c:\> for %i in (java.exe) do @echo.   %~$PATH:i

And so I did that and got the path "C:\\ProgramData\\Oracle\\Java\\javapath\\java.exe"

When I try linking via Unity > External tools > JDK it doesn't find any files.

I'm a bit clueless now.

Answer 1

@RealAnyOne, you have installed Java with JRE only installation ie, without out a JDK that's what you see only one folder and this is why it also showing version in the command line since it won't check for JDK. JRE is Java Runtime Environment, JDK is Java Development Kit which contains many essential libraries. So Ideally there should be two folders JRE and JDK. This is the reason you are getting this issue with Unity.

To Fix::

1. Uninstall old Java 8

2. Download Java 8 from the oracle website http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

3. Install it. Now you should have two folders. Then point your Unity to it.