Transcrypt 自动测试编译失败，显然是在缩小步骤

Question

刚刚安装了transcrypt。自动测试编译成功但在缩小时失败。我尝试更新到 JRE 8，但出现同样的错误。有什么让它发挥作用的建议吗？

谢谢！

$ uname -a
Darwin Michaels-Mac-mini 15.6.0 Darwin Kernel Version 15.6.0: Mon Jan  9 23:07:29 PST 2017; root:xnu-3248.60.11.2.1~1/RELEASE_X86_64 x86_64

$ python --version
Python 3.5.1 :: Anaconda 4.0.0 (x86_64)

$ transcrypt -h
Transcrypt (TM) Python to JavaScript Small Sane Subset Transpiler Version 3.6.24
Copyright (C) Geatec Engineering. License: Apache 2.0

$ java -version
java version "1.6.0_65"
Java(TM) SE Runtime Environment (build 1.6.0_65-b14-468-11M4833)
Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-468, mixed mode)

$ transcrypt -b autotest.py 
Transcrypt (TM) Python to JavaScript Small Sane Subset Transpiler Version 3.6.24
Copyright (C) Geatec Engineering. License: Apache 2.0

Saving result in: /Users/mellis/anaconda3/lib/python3.5/site-packages/transcrypt/development/automated_tests/transcrypt/__javascript__/autotest.js
Saving minified result in: /Users/mellis/anaconda3/lib/python3.5/site-packages/transcrypt/development/automated_tests/transcrypt/__javascript__/autotest.min.js
Exception in thread "main" java.lang.UnsupportedClassVersionError: com/google/javascript/jscomp/CommandLineRunner : Unsupported major.minor version 51.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
    at java.net.URLClassLoader.access[=10=]0(URLClassLoader.java:58)
    at java.net.URLClassLoader.run(URLClassLoader.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

Ready

Answer 1

从您的控制台输出看来，虽然您安装了 JRE 8，但您的系统仍在使用 JRE 6：

$ java -version

java version "1.6.0_65"

Java(TM) SE Runtime Environment (build 1.6.0_65-b14-468-11M4833)

Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-468, mixed mode)

由于您使用的是 Apple，因此应该有一个 "system preferences" 对话框。一旦您的机器上有多个版本的 JRE，此对话框中应该有一个项目允许您更改 Java 的设置，包括它将默认为哪个版本。

另请参阅：

java.lang.UnsupportedClassVersionError

您也可以通过命令行更改这些设置，请参阅：

How to set or change the default Java (JDK) version on OS X?

Transcrypt 自动测试编译失败，显然是在缩小步骤

Transcrypt autotest compilation fails, apparently at minification step

transcrypt