为什么在生成javadoc时会出现ClassCastException?

时间:2008-09-04 21:37:43

标签: java ant javadoc classcastexception

我正在使用ant来生成javadoc,但一遍又一遍地得到这个异常 - 为什么?

我使用的是JDK版 1.6.0_06

[javadoc] java.lang.ClassCastException: com.sun.tools.javadoc.ClassDocImpl cannot be cast to com.sun.javadoc.AnnotationTypeDoc
  [javadoc]     at com.sun.tools.javadoc.AnnotationDescImpl.annotationType(AnnotationDescImpl.java:46)
  [javadoc]     at com.sun.tools.doclets.formats.html.HtmlDocletWriter.getAnnotations(HtmlDocletWriter.java:1739)
  [javadoc]     at com.sun.tools.doclets.formats.html.HtmlDocletWriter.writeAnnotationInfo(HtmlDocletWriter.java:1713)
  [javadoc]     at com.sun.tools.doclets.formats.html.HtmlDocletWriter.writeAnnotationInfo(HtmlDocletWriter.java:1702)
  [javadoc]     at com.sun.tools.doclets.formats.html.HtmlDocletWriter.writeAnnotationInfo(HtmlDocletWriter.java:1681)
  [javadoc]     at com.sun.tools.doclets.formats.html.FieldWriterImpl.writeSignature(FieldWriterImpl.java:130)
  [javadoc]     at com.sun.tools.doclets.internal.toolkit.builders.FieldBuilder.buildSignature(FieldBuilder.java:184)
  [javadoc]     at sun.reflect.GeneratedMethodAccessor8.invoke(Unknown Source)
  [javadoc]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  [javadoc]     at java.lang.reflect.Method.invoke(Method.java:597)
  [javadoc]     at com.sun.tools.doclets.internal.toolkit.builders.FieldBuilder.invokeMethod(FieldBuilder.java:114)
  [javadoc]     at com.sun.tools.doclets.internal.toolkit.builders.AbstractBuilder.build(AbstractBuilder.java:90)
  [javadoc]     at com.sun.tools.doclets.internal.toolkit.builders.AbstractMemberBuilder.build(AbstractMemberBuilder.java:56)
  [javadoc]     at com.sun.tools.doclets.internal.toolkit.builders.FieldBuilder.buildFieldDoc(FieldBuilder.java:158)
  [javadoc]     at sun.reflect.GeneratedMethodAccessor51.invoke(Unknown Source)
  [javadoc]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  [javadoc]     at java.lang.reflect.Method.invoke(Method.java:597)
  [javadoc]     at com.sun.tools.doclets.internal.toolkit.builders.FieldBuilder.invokeMethod(FieldBuilder.java:114)
  [javadoc]     at com.sun.tools.doclets.internal.toolkit.builders.AbstractBuilder.build(AbstractBuilder.java:90)
  [javadoc]     at com.sun.tools.doclets.internal.toolkit.builders.AbstractMemberBuilder.build(AbstractMemberBuilder.java:56)
  [javadoc]     at com.sun.tools.doclets.internal.toolkit.builders.ClassBuilder.buildFieldDetails(ClassBuilder.java:301)
  [javadoc]     at sun.reflect.GeneratedMethodAccessor43.invoke(Unknown Source)
  [javadoc]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  [javadoc]     at java.lang.reflect.Method.invoke(Method.java:597)
  [javadoc]     at com.sun.tools.doclets.internal.toolkit.builders.ClassBuilder.invokeMethod(ClassBuilder.java:101)
  [javadoc]     at com.sun.tools.doclets.internal.toolkit.builders.AbstractBuilder.build(AbstractBuilder.java:90)
  [javadoc]     at com.sun.tools.doclets.internal.toolkit.builders.ClassBuilder.buildClassDoc(ClassBuilder.java:124)
  [javadoc]     at sun.reflect.GeneratedMethodAccessor19.invoke(Unknown Source)
  [javadoc]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  [javadoc]     at java.lang.reflect.Method.invoke(Method.java:597)
  [javadoc]     at com.sun.tools.doclets.internal.toolkit.builders.ClassBuilder.invokeMethod(ClassBuilder.java:101)
  [javadoc]     at com.sun.tools.doclets.internal.toolkit.builders.AbstractBuilder.build(AbstractBuilder.java:90)
  [javadoc]     at com.sun.tools.doclets.internal.toolkit.builders.ClassBuilder.build(ClassBuilder.java:108)
  [javadoc]     at com.sun.tools.doclets.formats.html.HtmlDoclet.generateClassFiles(HtmlDoclet.java:155)
  [javadoc]     at com.sun.tools.doclets.internal.toolkit.AbstractDoclet.generateClassFiles(AbstractDoclet.java:164)
  [javadoc]     at com.sun.tools.doclets.internal.toolkit.AbstractDoclet.startGeneration(AbstractDoclet.java:106)
  [javadoc]     at com.sun.tools.doclets.internal.toolkit.AbstractDoclet.start(AbstractDoclet.java:64)
  [javadoc]     at com.sun.tools.doclets.formats.html.HtmlDoclet.start(HtmlDoclet.java:42)
  [javadoc]     at com.sun.tools.doclets.standard.Standard.start(Standard.java:23)
  [javadoc]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  [javadoc]     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  [javadoc]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  [javadoc]     at java.lang.reflect.Method.invoke(Method.java:597)
  [javadoc]     at com.sun.tools.javadoc.DocletInvoker.invoke(DocletInvoker.java:215)
  [javadoc]     at com.sun.tools.javadoc.DocletInvoker.start(DocletInvoker.java:91)
  [javadoc]     at com.sun.tools.javadoc.Start.parseAndExecute(Start.java:340)
  [javadoc]     at com.sun.tools.javadoc.Start.begin(Start.java:128)
  [javadoc]     at com.sun.tools.javadoc.Main.execute(Main.java:41)
  [javadoc]     at com.sun.tools.javadoc.Main.main(Main.java:31)

4 个答案:

答案 0 :(得分:54)

看起来这已被报告为Java bug。它似乎是由于使用来自第三方库(如JUnit)的注释而不是在javadoc调用中包含带有该注释的jar引起的。

如果是这种情况,只需在javadoc上使用-classpath选项并包含额外的jar文件。

答案 1 :(得分:1)

我对这个问题有一些了解,但这不是解决方案。

如果您在注释之前提供单个注释行\\\\并尝试再次运行javadoc。这个问题将解决

例如:sample.java文件

@ChannelPipeline

更改

\\\\@ChannelPipeline

尝试再次运行javadoc命令。现在不会发生类别转换异常

答案 2 :(得分:0)

我也遇到了这个问题。我可以正确编译,没有任何错误或警告。但是当我生成javadoc时,我得到了以下错误。

  

[javadoc] java.lang.ClassCastException:com.sun.tools.javadoc.ClassDocImpl无法强制转换为com.sun.javadoc.AnnotationTypeDoc

这是我的第三方库的类路径加载...

<path id="build.classpath">
<fileset dir=".">
    <include name="libs/*.jar" />
</fileset>

在我的java编译目标..

<target name="compile" depends="clean, makedir">
<javac includeantruntime="false" srcdir="${src.dir}" destdir="${build.dir}" classpathref="build.classpath">
  <compilerarg value="-Xlint:unchecked"/>
</javac>

在我的javadoc目标......

<target name="docs" depends="compile">
<javadoc packagenames="src" sourcepath="${src.dir}" destdir="${docs.dir}" 
    failonerror="no"
    author="true"
    version="true"
    windowtitle="${Name} API"
    doctitle="${Name}"
    bottom="Copyright © 2014 ColayHIlls.com . All Rights Reserved.">
   <fileset dir="${src.dir}">
            <include name="main/java/com/colayhills/jpcenter/business/service/**" />
   </fileset>
</javadoc>
<echo message="java docs has been generated!"/>
</target>

因此,我向classpathref="build.classpath"标记添加了<javadoc选项。现在对我来说没问题。

答案 3 :(得分:0)

还有另一种方法可以获得ClassCastException(1.8.0_101当前失败):

java.lang.ClassCastException: com.sun.tools.javadoc.MethodDocImpl cannot be cast to com.sun.tools.javadoc.AnnotationTypeElementDocImpl

当javadoc在处理代码中首次使用的相同注释之前遇到javadoc文本中的注释方法的引用时,会发生这种情况。拿这两个类:

/**
 ** {@link javax.annotation.Generated#value()}
 */
public class TestClass1 {}


@Generated("sometext")
public class TestClass2 {}

该错误依赖于订单。如果javadoc首先处理TestClass1,则会抛出ClassCastException。如果javadoc首先处理TestClass2,它将完成正常。该错误报告为JDK-8170444

作为解决方法,请勿链接到文档文本中的注释方法。