This Bugzilla instance is a read-only archive of historic NetBeans bug reports. To report a bug in NetBeans please follow the project's instructions for reporting issues.
docbook/src/org/netbeans/modules/docbook/DocBookDataObject.java docbook/src/org/netbeans/modules/docbook/resources/solbook/SolBookDataObject.java should override getLookup() in a way that doesn't acquire Children.MUTEX (unlike the default implementation in DataObject.getLookup). Cf. issue 147492.
Fixed in http://hg.netbeans.org/main/contrib/rev/9f81c3f71143
x