Nieobsługiwana wersja major.minor 51.0 podczas pracy z ramą odtwarzania

Question

Wiem, że istnieje konflikt wersji. Po prostu chcę, żeby ktoś mi powiedział, jak to rozwiązać. W poprzednim poście Stackoverflow nikt nie mówi o rozwiązaniu.

Wersje: Ubuntu: 12.04.1 LTS Java: 1.6.0_24 (OpenJDK) javac: 1.7.0_07 (OpenJDK)

haider@haider-desktop:~/Documents/projects/java-projects/mytestapp$ play 
[info] Loading project definition from /home/haider/Documents/projects/java-projects/mytestapp/project 
[info] Set current project to mytestapp (in build file:/home/haider/Documents/projects/java-projects/mytestapp/) 
     _   _ 
_ __ | | __ _ _ _| | 
| '_ \| |/ _' | || |_| 
| __/|_|\____|\__ (_) 
|_|   |__/ 

play! 2.0.4, http://www.playframework.org 

> Type "help play" or "license" for more information. 
> Type "exit" or use Ctrl+D to leave this console. 

[mytestapp] $ run 

--- (Running the application from SBT, auto-reloading is enabled) --- 
[info] play - Listening for HTTP on port 9000... 

(Server started, use Ctrl+D to stop and go back to the console...) 

[info] Compiling 5 Scala sources and 2 Java sources to /home/haider/Documents/projects/libraries/play-2.0.4/samples/java/helloworld/target/scala-2.9.1/classes... 
[warn] Problem processing dependencies of source /home/haider/Documents/projects/libraries/play-2.0.4/samples/java/helloworld/target/scala-2.9.1/src_managed/main/controllers/routes.java : java.lang.UnsupportedClassVersionError: controllers/routes : Unsupported major.minor version 51.0 
[warn] Problem processing dependencies of source /home/haider/Documents/projects/libraries/play-2.0.4/samples/java/helloworld/target/scala-2.9.1/src_managed/main/controllers/routes.java : java.lang.UnsupportedClassVersionError: controllers/routes$javascript : Unsupported major.minor version 51.0 
[warn] Problem processing dependencies of source /home/haider/Documents/projects/libraries/play-2.0.4/samples/java/helloworld/target/scala-2.9.1/src_managed/main/controllers/routes.java : java.lang.UnsupportedClassVersionError: controllers/routes : Unsupported major.minor version 51.0 
[warn] Problem processing dependencies of source /home/haider/Documents/projects/libraries/play-2.0.4/samples/java/helloworld/target/scala-2.9.1/src_managed/main/controllers/routes.java : java.lang.UnsupportedClassVersionError: controllers/routes$ref : Unsupported major.minor version 51.0 
[warn] Problem processing dependencies of source /home/haider/Documents/projects/libraries/play-2.0.4/samples/java/helloworld/target/scala-2.9.1/src_managed/main/controllers/routes.java : java.lang.UnsupportedClassVersionError: controllers/routes$javascript : Unsupported major.minor version 51.0 
[warn] Problem processing dependencies of source /home/haider/Documents/projects/libraries/play-2.0.4/samples/java/helloworld/target/scala-2.9.1/src_managed/main/controllers/routes.java : java.lang.UnsupportedClassVersionError: controllers/routes : Unsupported major.minor version 51.0 
[warn] Problem processing dependencies of source /home/haider/Documents/projects/libraries/play-2.0.4/samples/java/helloworld/target/scala-2.9.1/src_managed/main/controllers/routes.java : java.lang.UnsupportedClassVersionError: controllers/routes$ref : Unsupported major.minor version 51.0 
[warn] Error reading API from class file : java.lang.UnsupportedClassVersionError: controllers/routes$javascript : Unsupported major.minor version 51.0 
[warn] Error reading API from class file : java.lang.UnsupportedClassVersionError: controllers/routes : Unsupported major.minor version 51.0 
[warn] Error reading API from class file : java.lang.UnsupportedClassVersionError: controllers/routes$ref : Unsupported major.minor version 51.0 
[warn] Problem processing dependencies of source /home/haider/Documents/projects/libraries/play-2.0.4/samples/java/helloworld/app/controllers/Application.java : java.lang.UnsupportedClassVersionError: controllers/Application$Hello : Unsupported major.minor version 51.0 
[warn] Problem processing dependencies of source /home/haider/Documents/projects/libraries/play-2.0.4/samples/java/helloworld/app/controllers/Application.java : java.lang.UnsupportedClassVersionError: controllers/Application : Unsupported major.minor version 51.0 
[warn] Problem processing dependencies of source /home/haider/Documents/projects/libraries/play-2.0.4/samples/java/helloworld/app/controllers/Application.java : java.lang.UnsupportedClassVersionError: controllers/Application$Hello : Unsupported major.minor version 51.0 
[warn] Problem processing dependencies of source /home/haider/Documents/projects/libraries/play-2.0.4/samples/java/helloworld/app/controllers/Application.java : java.lang.UnsupportedClassVersionError: controllers/Application : Unsupported major.minor version 51.0 
[warn] Error reading API from class file : java.lang.UnsupportedClassVersionError: controllers/Application$Hello : Unsupported major.minor version 51.0 
[warn] Error reading API from class file : java.lang.UnsupportedClassVersionError: controllers/Application : Unsupported major.minor version 51.0 
[info] play - Application started (Dev) 

Answer 1

Używasz różnych wersji JDK, aby skompilować i uruchomić aplikację . Można powiedzieć, że:

java: 1.6.0_24 (OpenJDK) 
javac: 1.7.0_07 (OpenJDK) 

więc kompilator (javac) jest nowszy niż uwolnienie java polecenia , co oznacza drugie nie można uruchomić swoje skompilowane pliki. Należy użyć tylko 1 wersję JDK (taki sam dla Java i javac)

Answer 2

na Ubuntu zmienić wersję Javy zarówno kompilacji i uruchamiania trzeba zadzwonić:

sudo update-alternatives --config javac 

i

sudo update-alternatives --config java 

Answer 3

Lepszym rozwiązaniem jest zmiana wersji docelowej, więc możesz skompilować do wersji 1.6 z 1,7 w następujący sposób: How can I set the javac compile version for Play Framework 2.0 to prevent "Unsupported major.minor version"?

Umieść to w swojej kompilacji .scala:

val main = play.Project(appName, appVersion, appDependencies).settings(
    // Force compilation in java 1.6 
    javacOptions in Compile ++= Seq("-source", "1.6", "-target", "1.6") 
)