Here is the self-explanatory shell transcript

$ javadoc -help
usage: javadoc [options] [packagenames] [sourcefiles] [classnames] [@files]
-overview <file> Read overview documentation from HTML file
-public Show only public classes and members
-protected Show protected/public classes and members (default)
-package Show package/protected/public classes and members
-private Show all classes and members
-help Display command line options and exit
-doclet <class> Generate output via alternate doclet
-docletpath <path> Specify where to find doclet class files
-sourcepath <pathlist> Specify where to find source files
-classpath <pathlist> Specify where to find user class files
-exclude <pkglist> Specify a list of packages to exclude
-subpackages <subpkglist> Specify subpackages to recursively load
-breakiterator Compute 1st sentence with BreakIterator
-bootclasspath <pathlist> Override location of class files loaded
by the bootstrap class loader
-source <release> Provide source compatibility with specified release
-extdirs <dirlist> Override location of installed extensions
-verbose Output messages about what Javadoc is doing
-locale <name> Locale to be used, e.g. en_US or en_US_WIN
-encoding <name> Source file encoding name
-J<flag> Pass <flag> directly to the runtime system

javadoc: In doclet class com.sun.tools.doclets.standard.Standard, method optionLength has thrown an exception java.lang.reflect.InvocationTargetException
java.lang.NullPointerException
at com.sun.tools.doclets.internal.toolkit.util.MessageRetriever.printNotice(MessageRetriever.java:190)
at com.sun.tools.doclets.internal.toolkit.util.MessageRetriever.notice(MessageRetriever.java:386)
at com.sun.tools.doclets.formats.html.ConfigurationImpl.optionLength(ConfigurationImpl.java:291)
at com.sun.tools.doclets.formats.html.HtmlDoclet.optionLength(HtmlDoclet.java:202)
at com.sun.tools.doclets.standard.Standard.optionLength(Standard.java:12)
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:324)
at com.sun.tools.javadoc.DocletInvoker.invoke(DocletInvoker.java:209)
at com.sun.tools.javadoc.DocletInvoker.optionLength(DocletInvoker.java:115)
at com.sun.tools.javadoc.Start.usage(Start.java:108)
at com.sun.tools.javadoc.Start.parseAndExecute(Start.java:204)
at com.sun.tools.javadoc.Start.begin(Start.java:127)
at com.sun.tools.javadoc.Main.execute(Main.java:41)
at com.sun.tools.javadoc.Main.main(Main.java:31)
1 error

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