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I'm using ant to generate javadocs, but get this exception over and over - why?
I'm using JDK version 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) 
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ClassCastException is a runtime exception raised in Java when we try to improperly cast a class from one type to another. It's thrown to indicate that the code has attempted to cast an object to a related class, but of which it is not an instance.
To prevent the ClassCastException exception, one should be careful when casting objects to a specific class or interface and ensure that the target type is a child of the source type, and that the actual object is an instance of that type.
Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance. So, for example, when one tries to cast an Integer to a String , String is not an subclass of Integer , so a ClassCastException will be thrown. Object i = Integer.
What you can do is pass in an instance of the Class of the parameterised type (assuming it isn't generic). class MyReader<T> { private final Class<T> clazz; MyReader(Class<T> clazz) { if (clazz == null) { throw new NullPointerException(); } this. clazz = clazz; } public T restore(String from) { ...
It looks like this has been reported as a Java bug. It appears to be caused by using annotations from a 3rd party library (like JUnit) and not including the jar with that annotation in the javadoc invocation.
If that is the case, just use the -classpath option on javadoc and include the extra jar files.
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I have some idea regarding this problem but this not exact solution to get.
If you give single comment line // before annotation and try to run the javadoc once again. This problem will solve
Eg: sample.java file
@ChannelPipeline Makes changes in
//@ChannelPipeline Try to run javadoc command once again. Now ClassCastException won't occur.
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