(Reported by Brian Burkhalter)

$ /opt/jdk/1.8.0/bin/javadoc /w/jjg/work/tl/jdk/src/share/classes/java/util/Optional.java
Loading source file /w/jjg/work/tl/jdk/src/share/classes/java/util/Optional.java...
Constructing Javadoc information...
Standard Doclet version 1.8.0-ea
Building tree for all the packages and classes...
Generating ./java/util/Optional.html...
/w/jjg/work/tl/jdk/src/share/classes/java/util/Optional.java:97: warning: no @param for <T>
    public static <T> Optional<T> of(T value) {
                                  ^
/w/jjg/work/tl/jdk/src/share/classes/java/util/Optional.java:176: error: reference not found
     * @throws X if there is no value present
       ^
/w/jjg/work/tl/jdk/src/share/classes/java/util/Optional.java:180: warning: no @throws for X
    public <X extends Throwable> T orElseThrow(Supplier<? extends X> exceptionSupplier) throws X {
                                   ^
Generating ./java/util/package-frame.html...
Generating ./java/util/package-summary.html...
Generating ./java/util/package-tree.html...
Generating ./constant-values.html...
Building index for all the packages and classes...
Generating ./overview-tree.html...
Generating ./index-all.html...
Generating ./deprecated-list.html...
Building index for all classes...
Generating ./allclasses-frame.html...
Generating ./allclasses-noframe.html...
Generating ./index.html...
Generating ./help-doc.html...
1 error
2 warnings