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Discovered while investigating issue #225419 that these snapshots belongs to this area. The snapshots can be found in Exception Report URL, please evaluate them, thanks. snapshot-662441: org.netbeans.modules.apisupport.project.universe.ModuleList.scanJars() 99.24911 30 450 ms (99,2%) 30 450 ms Scanning JARs under write lock. snapshot-670812: org.netbeans.modules.apisupport.project.universe.ModuleList.scanJars() 79.44007 10 001 ms (79,4%) 10 001 ms Scanning JARs under write lock. snapshot-677039: org.netbeans.modules.apisupport.project.universe.ModuleList.scanJars() 98.41134 42 497 ms (98,4%) 42 497 ms Scanning JARs under write lock.
According to first snapshot: probably awt is waiting on read mutex in Opening Projects thread with writeAccess mutex - there is invoked method findBinaryNBMFiles() so many times (259x) and inside method isFile() almost 400 times...Rest ones are similar but awt is waiting for writeAccess...
*** Bug 230775 has been marked as a duplicate of this bug. ***
Created attachment 140084 [details] nps snapshot I deleted a newly create Netbeans Module Project
Created attachment 143292 [details] nps snapshot Found this in the Notifications TopCOmponent