javadoc NullPointerException

[KenB]

Can anyone point me in the right direction on this javadoc error?

Thanks!

Standard Doclet version 1.6.0_10
Building tree for all the packages and classes...
java.lang.NullPointerException
at com.sun.tools.javadoc.TypeMaker.getType(TypeMaker. java:67)
at com.sun.tools.javadoc.TypeMaker.getType(TypeMaker. java:29)
at com.sun.tools.javadoc.ClassDocImpl.superclassType( ClassDocImpl.java:441)
at com.sun.tools.doclets.internal.toolkit.util.Util.g etAllInterfaces(Util.java:386)
at com.sun.tools.doclets.internal.toolkit.util.Util.g etAllInterfaces(Util.java:424)
at com.sun.tools.doclets.internal.toolkit.util.ClassT ree.processType(ClassTree.java:162)
at com.sun.tools.doclets.internal.toolkit.util.ClassT ree.buildTree(ClassTree.java:114)
at com.sun.tools.doclets.internal.toolkit.util.ClassT ree.<init>(ClassTree.java:73)
at com.sun.tools.doclets.internal.toolkit.AbstractDoc let.startGeneration(AbstractDoclet.java:104)
at com.sun.tools.doclets.internal.toolkit.AbstractDoc let.start(AbstractDoclet.java:64)
at com.sun.tools.doclets.formats.html.HtmlDoclet.star t(HtmlDoclet.java:42)
at com.sun.tools.doclets.standard.Standard.start(Stan dard.java:23)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Native MethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.sun.tools.javadoc.DocletInvoker.invoke(DocletI nvoker.java:269)
at com.sun.tools.javadoc.DocletInvoker.start(DocletIn voker.java:143)
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)
2 warnings

[xyz]

I was having the same problem, could not find any solution on google, but eventually found it myself.
For me the solution was to put in the javadoc classpath every jar that application depends to. Getting rid of the "cannot find symbol" errors fixed this peculiar error.