下面的教程时，java.lang.UnsupportedClassVersionError

Question

I'm trying to use Play! but I always get an error when trying to run a project: [error] java.lang.UnsupportedClassVersionError: com/typesafe/config/ConfigException : Unsupported major.minor version 52.0

When I do java -version or javac -version , it confirms I'm using Java 8 by outputting 1.8.0_45 . I don't understand why this error happens, the docs says I NEED java 8 for the latest Play! version, the project has a dependency to Play! 2.4.2.

I followed the documentation: installed activator, added it to the path, generated a new project form the template 'java-play-intro' but when i type activator in my project directory, I always get the error above. I tried to use the update-alternative command to use java 6 and then 7 but the error is exactly the same.

BUT when I use activator ui it works fine !

How is this possible? Am I always supposed to use the UI?

Answer 1

很可能是您正在启动的脚本，使用JAVA_HOME环境变量而不是PATH上可以找到的JDK二进制文件。