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Please move the code TopManager.getDefault().getPlaces().nodes().environment() out of writeAccess block. Also you can try to check whether the invironmnet node isInitialized - if it is not than you probably don't have to do the rest.
Fixed. DatabaseModule.close() method modified as described in the previous comment. Not possible to use isInitialized() method because this method is protected in org.openide.nodes.Children
Verified
Resolved for 3.3.x or earlier, no new info since then -> closing.