Transcrypt autotest compilation fails, apparently at minification step

Just installed transcrypt. Autotest compilation succeeds but fails at minification. I tried updating to JRE 8, but same error. Any advice for making it work?

Thanks!

$ 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$000(URLClassLoader.java:58)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

Ready

Solution

From the your console output it seems that, while you installed JRE 8, your system still uses 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)

Since you'r on Apple, there should be a "system preferences" dialog. As soon as there's more than one version of the JRE on you machine, there should be an item in this dialog that allows you to change the settings for Java, including which version it will default to.