Gradle で NoClassDefFoundError でビルドできない時 ref: http://qiita.com/yukung/items/fb3f2592a9f01003229c

file0.txt

$ ./gradlew tasks --debug
(省略)
15:49:07.706 [ERROR] [org.gradle.BuildExceptionReporter] FAILURE: Build failed with an exception.
15:49:07.707 [ERROR] [org.gradle.BuildExceptionReporter]
15:49:07.707 [ERROR] [org.gradle.BuildExceptionReporter] * Where:
15:49:07.707 [ERROR] [org.gradle.BuildExceptionReporter] Build file '~/src/github.com/yukung/some-project/build.gradle' line: 167
15:49:07.707 [ERROR] [org.gradle.BuildExceptionReporter]
15:49:07.708 [ERROR] [org.gradle.BuildExceptionReporter] * What went wrong:
15:49:07.708 [ERROR] [org.gradle.BuildExceptionReporter] A problem occurred evaluating root project 'some-project'.
15:49:07.708 [ERROR] [org.gradle.BuildExceptionReporter] > [Ljava/util/HashMap$Entry;
15:49:07.709 [ERROR] [org.gradle.BuildExceptionReporter]
15:49:07.709 [ERROR] [org.gradle.BuildExceptionReporter] * Exception is:
15:49:07.724 [ERROR] [org.gradle.BuildExceptionReporter] org.gradle.api.GradleScriptException: A problem occurred evaluating root project
(省略)
15:49:07.742 [ERROR] [org.gradle.BuildExceptionReporter] Caused by: java.lang.NoClassDefFoundError: [Ljava/util/HashMap$Entry;

file1.txt

$ ./gradlew --version

------------------------------------------------------------
Gradle 1.12
------------------------------------------------------------

Build time:   2014-04-29 09:24:31 UTC
Build number: none
Revision:     a831fa866d46cbee94e61a09af15f9dd95987421

Groovy:       1.8.6
Ant:          Apache Ant(TM) version 1.9.3 compiled on December 23 2013
Ivy:          2.2.0
JVM:          1.8.0_20 (Oracle Corporation 25.20-b23) # <-- コレがおかしい
OS:           Mac OS X 10.9.5 x86_64

$ java -version
java version "1.8.0_20"
Java(TM) SE Runtime Environment (build 1.8.0_20-b26)
Java HotSpot(TM) 64-Bit Server VM (build 25.20-b23, mixed mode)

file2.txt

export JAVA_HOME=$(/usr/libexec/java_home -v 1.8)