The extLink taglet that was introduced in JDK-8178725 has a "&" in the base URL segment, which needs to be expressed as "&" instead. Bug: https://bugs.openjdk.java.net/browse/JDK-8180486 WebRev: http://cr.openjdk.java.net/~ihse/JDK-8180486-extLink-taglet-needs-escaped-ampersand/webrev.01 /Magnus