A checker detected the following issue:
api/serialized-form.html:9077: name already declared: Path2DSerialData

This appears to be caused by duplicate declarations in
open/src/java.desktop/share/classes/java/awt/geom/Path2D.java

$ grep -r Path2DSerialData open/src
open/src/java.desktop/share/classes/java/awt/geom/Path2D.java: * <a id="Path2DSerialData"><!-- --></a>
open/src/java.desktop/share/classes/java/awt/geom/Path2D.java: * <a id="Path2DSerialData"><!-- --></a>

These declarataions appear to be declared but never referenced, so renaming or deleting them may be OK:
$ grep -r Path2DSerialData build/linux-x86_64-server-release/images/docs
build/linux-x86_64-server-release/images/docs/api/serialized-form.html:<dd><a id="Path2DSerialData"><!-- --></a>
build/linux-x86_64-server-release/images/docs/api/serialized-form.html:<dd><a id="Path2DSerialData"><!-- --></a>

This is part of the noise affecting our ability to get to the goal of no broken links.