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This bug was originally marked as duplicate of bug 222320, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 8.0.2 (Build 201411181905) VM: OpenJDK 64-Bit Server VM, 24.65-b04, OpenJDK Runtime Environment, 1.7.0_65-b32 OS: Linux User Comments: GUEST: Occurs when uploading about 500 files to FTP. Stacktrace: java.lang.StringIndexOutOfBoundsException: String index out of range: 8 at java.lang.String.charAt(String.java:658) at nu.validator.htmlparser.impl.NCName.escapeName(NCName.java:482) at nu.validator.htmlparser.impl.HtmlAttributes.processNonNcNames(HtmlAttributes.java:479) at nu.validator.htmlparser.impl.TreeBuilder.checkAttributes(TreeBuilder.java:4762) at nu.validator.htmlparser.impl.TreeBuilder.appendToCurrentNodeAndPushElementMayFoster(TreeBuilder.java:4894) at nu.validator.htmlparser.impl.TreeBuilder.startTag(TreeBuilder.java:2320)
Created attachment 151348 [details] stacktrace
Html validator was updated in http://hg.netbeans.org/web-main/rev/26573d86f877 This could be fixed by this update in 2016 dev build. If not please reopen this issue.