Attempt to generate the external link with {@link} tag and -linkoffline option leads to "reference not found" error from doclint (which is turned on by default).
At the same time the generated link in the html document is correct.
Existing documentation does not assume such limitation (http://docs.oracle.com/javase/8/docs/technotes/tools/windows/javadoc.html#CHDFIIJH)

(Use modified langtools\test\jdk\javadoc\doclet\testClassCrossReferences\TestClassCrossReferences.java to reproduce)