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See isssue https://netbeans.org/bugzilla/show_bug.cgi?id=232470 and apply the same fix as J2SE if useful. The web project uses -Xbootclasspath: more often so it may not help.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss