Unsupported majorの解決方法minor version 52.0問題?

 
  
 
   
今天运行./gradlew :PandaAndroidDemo:release出现如下错误：
 
   
 
 
   
FAILURE: Build failed with an exception.

* Where:
Build file '/Users/shitianci/work/Lab/panda.android/PandaAndroidDemo/build.gradle' line: 1

* What went wrong:
A problem occurred evaluating project ':PandaAndroidDemo'.
> java.lang.UnsupportedClassVersionError: com/android/build/gradle/AppPlugin : Unsupported major.minor version 52.0

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED
  
 
   
直接点击 run按钮 或者 Build→Generate Build APK 却运行正常。
 
   
这里面有两个问题：
 
   
 
    
为什么出现Unsupported major.minor version 52.0？
 
    
为什么gradle命令和android studio按钮运行结果不一样？
 
   
 
   
问题一：为什么出现Unsupported major.minor version 52.0？
 
   
在网上找了一圈，最后在stackoverflow找到了本质原因
 
   
   
    
You get this error because a Java 7 VM tries to load a class compiled for Java 8

Java 8 has the class file version 52.0 but a Java 7 VM can only load class files up to version 51.0

In your case the Java 7 VM is your gradle build and the class is com.android.build.gradle.AppPlugin
  
    

  
   
    ，  java         ，java 8 class file    52，Java 7        51。       java 8 vm  。
 
   
   ：   gradle   android studio         ？
 
   
   1  ，  Android Studio      java 8 vm，          ，   Project Structure       ：
 
   
  
    
 
    

      Paste_Image.png 
    
 
   
 
   

Android Studio 2.2.2      JDK  ，    
 
    
/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home
  
   
 gradle         gradle.properties   ，    ：
 
    
org.gradle.java.home=/Library/Java/JavaVirtualMachines/jdk1.7.0_71.jdk/Contents/home
  
   
     ：
 
    
org.gradle.java.home=/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home
  
   
    。
 
   
  ：
 
   
 
    
CircleCI Android Unsupported major.minor version 52.0
 
   
 
     
  
 
  
  ：   Panda 
  
  ：http://www.jianshu.com/p/5eebd3c609d6 
  
  ：   
  
        。             ，          。