This bug was originally marked as duplicate of bug 249847, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related.

Build: NetBeans IDE 8.2 (Build 201609300101)
VM: Java HotSpot(TM) 64-Bit Server VM, 25.112-b16, Java(TM) SE Runtime Environment, 1.8.0_112-b16
OS: Mac OS X

User Comments:
vriha: To reproduce:
 - create a new Java Web project with JSF 2.2
 - select the text in index.xhtml and convert it to Composite Component
 - open the composite component and replace its content with https://netbeans.org/bugzilla/attachment.cgi?id=151531
 - in index.xhtml, try to iinvoke cc in position of ^
<ez:out ^ />

roben: This occured while editing a facelet and the auto completion for the message bundle popped up. Netbeans was not responsive for several seconds and the state showed "Downloading http javadoc". This happens nearly on a daily basis.




Stacktrace: 
java.lang.NullPointerException
   at org.netbeans.modules.web.jsf.editor.completion.JsfAttributesCompletionHelper.containsCCEntry(JsfAttributesCompletionHelper.java:201)
   at org.netbeans.modules.web.jsf.editor.completion.JsfAttributesCompletionHelper.completeAttributes(JsfAttributesCompletionHelper.java:177)
   at org.netbeans.modules.web.jsf.editor.JsfHtmlExtension.completeAttributes(JsfHtmlExtension.java:342)
   at org.netbeans.modules.html.editor.completion.HtmlCompletionQuery.query(HtmlCompletionQuery.java:485)
   at org.netbeans.modules.html.editor.completion.HtmlCompletionQuery$1.run(HtmlCompletionQuery.java:134)
   at org.netbeans.editor.BaseDocument.render(BaseDocument.java:1421)