启动 gradle 1.1 时得到以下堆栈跟踪，任何人都知道如何解决它们：
Exception in thread "main" java.lang.NullPointerException
at org.gradle.wrapper.BootstrapMainStarter.findLauncherJar(BootstrapMainStarter.java:37)
at org.gradle.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java:28)
at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:130)
at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:47)
我认为 dists/gradle-1.1-bin/13d7lnhcrghv2i5e54el41jpgr/gradle-1.1-bin.zip 的自动解压缩可能会失败。我检查了权限，并且我可以访问该目录。
如果我手动解压缩，则会收到以下错误：
Exception in thread "main" java.lang.RuntimeException: Gradle distribution 'http://services.gradle.org/distributions/gradle-1.1-bin.zip' contains too many directories. Expected to find exactly 1 directory.
at org.gradle.wrapper.Install.createDist(Install.java:73)
at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:129)
at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:47)
我对 gradle nullpointerexception 进行了谷歌搜索，它提到需要设置 JAVA_HOME 以进行编译，但我已经检查它是否设置正确并且能够在该环境中使用 ant 编译东西。