[플러터] 19. 빌드 에러(FAILURE: Build failed with an exception. You need Java 11)

플러터로 개발할 때 빌드 시 아래와 같은 에러를 만난다고 하면.....

 - java 11 버전 이상 사용하라는 말이다!!

FAILURE: Build failed with an exception.

* Where:
Build file '[프로젝트 디렉토리]\android\app\build.gradle' line: 24

* What went wrong:
A problem occurred evaluating project ':app'.
> Failed to apply plugin 'com.android.internal.application'.
   > Android Gradle plugin requires Java 11 to run. You are currently using Java 1.8.
     You can try some of the following options:
       - changing the IDE settings.
       - changing the JAVA_HOME environment variable.
       - changing `org.gradle.java.home` in `gradle.properties`.

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

* Get more help at https://help.gradle.org

BUILD FAILED in 6s

┌─ Flutter Fix ─────────────────────────────────────────────────────────────────┐
│ [!] You need Java 11 or higher to build your app with this version of Gradle. │
│                                                                               │
│ To get Java 11, update to the latest version of Android Studio on             │
│ https://developer.android.com/studio/install.                                 │
│                                                                               │
│ To check the Java version used by Flutter, run `flutter doctor -v`.           │
└───────────────────────────────────────────────────────────────────────────────┘
Exception: Gradle task assembleDebug failed with exit code 1

 

어떻게 하라고 친절하게 알려준다.

그런데 저 gradle.properties 이 어디 있냐고????!!!

그거슨 바로 여기~~~

 - [프로젝트 디렉토리]/android/gradle.properties

org.gradle.jvmargs=-Xmx1536M
android.useAndroidX=true
android.enableJetifier=true
org.gradle.java.home=[JAVA 설치 디렉토리. ex) C:\\Program Files\\Java\\jdk-11]

 

 

그런데 말입니다~~~

난 이미 자바 11 버전을 쓰고 있는데 왜 이런 에러가 발생하는지... 참... --;;;

C:\Users\home>java -version
openjdk version "11" 2018-09-25
OpenJDK Runtime Environment 18.9 (build 11+28)
OpenJDK 64-Bit Server VM 18.9 (build 11+28, mixed mode)