执行命令：gradlew install 时报以下错误：

java.lang.ClassCastException: com.sun.tools.javadoc.ClassDocImpl cannot be cast to com.sun.javadoc.AnnotationTypeDoc

网上查了一下，可能是以下问题导致：

1、jdk版本

2、maven javadoc插件版本

我本地安装的JDK版本是：1.6.0_43,后来换成：1.7.0_79 ，解决了这个问题。

参考资料：

http://stackoverflow.com/questions/25971832/javadoc-generation-failed-classcastexception-com-sun-tools-javadoc-classdocim

http://blog.csdn.net/ningxuezhu/article/details/39522387

错误完整日志：

java.lang.ClassCastException: com.sun.tools.javadoc.ClassDocImpl cannot be cast to com.sun.javadoc.AnnotationTypeDoc

at com.sun.tools.javadoc.AnnotationDescImpl.annotationType(AnnotationDescImpl.java:46)

at com.sun.tools.doclets.internal.toolkit.util.ClassUseMapper.mapAnnotations(ClassUseMapper.java:439)

at com.sun.tools.doclets.internal.toolkit.util.ClassUseMapper.(ClassUseMapper.java:183)

at com.sun.tools.doclets.formats.html.ClassUseWriter.generate(ClassUseWriter.java:109)

at com.sun.tools.doclets.formats.html.HtmlDoclet.generateOtherFiles(HtmlDoclet.java:92)

at com.sun.tools.doclets.internal.toolkit.AbstractDoclet.startGeneration(AbstractDoclet.java:122)

at com.sun.tools.doclets.internal.toolkit.AbstractDoclet.start(AbstractDoclet.java:64)

at com.sun.tools.doclets.formats.html.HtmlDoclet.start(HtmlDoclet.java:42)

at com.sun.tools.doclets.standard.Standard.start(Standard.java:23)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

at com.sun.tools.javadoc.DocletInvoker.invoke(DocletInvoker.java:215)

at com.sun.tools.javadoc.DocletInvoker.start(DocletInvoker.java:91)

at com.sun.tools.javadoc.Start.parseAndExecute(Start.java:340)

at com.sun.tools.javadoc.Start.begin(Start.java:128)

at com.sun.tools.javadoc.Main.execute(Main.java:41)

at com.sun.tools.javadoc.Main.main(Main.java:31)