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[Albert Cardona <1880246@xxxxxxxxxxxxxxxxxx>]

Update: if run the Fiji launcher ```Image-linux64 --system``` (runs Fiji
with java 8u252) and don't click anywhere until the Fiji window is open
and ready, then the UI is responsive as expected (i.e. all is good).

But if I click away to another application while Fiji is launching, then
the UI, when ready, is frozen.

A workaround is then to either be patient and not click anywhere, or to
use the 8u172 java bundled with Fiji, which doesn't have this UI
freezing problem. (Merely run Fiji like ```ImageJ-linux64```, assuming
the Fiji.app/java/linux-amd64/ folder is populated with java jdk 8u172).

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which is subscribed to openjdk-8 in Ubuntu.
https://bugs.launchpad.net/bugs/1880246

Title:
  Java desktop application freezes with openjdk 8u252

Status in openjdk-8 package in Ubuntu:
  New

Bug description:
  When launching the java desktop application Fiji (https://fiji.sc)
  using the system-wide openjdk 8u252, the UI is frozen. After trying
  many relaunches, occasionally (1 our of 30 times or so), the
  application isn't frozen, indicating some sort of race condition.

  When the UI is frozen, the jconsole indicates that the event dispatch
  thread is blocked:

  ```
  Name: AWT-EventQueue-1
  State: BLOCKED on java.awt.Component$AWTTreeLock@1bde9d17 owned by: main
  Total blocked: 10  Total waited: 61

  Stack trace: 
  java.awt.Container.dispatchEventImpl(Container.java:2300)
  java.awt.Component.dispatchEvent(Component.java:4711)
  java.awt.EventQueue.dispatchEventImpl(EventQueue.java:760)
  java.awt.EventQueue.access$500(EventQueue.java:97)
  java.awt.EventQueue$3.run(EventQueue.java:709)
  java.awt.EventQueue$3.run(EventQueue.java:703)
  java.security.AccessController.doPrivileged(Native Method)
  java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
  java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:84)
  java.awt.EventQueue$4.run(EventQueue.java:733)
  java.awt.EventQueue$4.run(EventQueue.java:731)
  java.security.AccessController.doPrivileged(Native Method)
  java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
  java.awt.EventQueue.dispatchEvent(EventQueue.java:730)
  org.GNOME.Accessibility.AtkWrapper$6.dispatchEvent(AtkWrapper.java:705)
  java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
  java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
  java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
  java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
  java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
  java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
  ```

  When launching the Fiji java desktop application with openjdk java
  8u172, no such problem occurs ever.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: openjdk-8-jdk 8u252-b09-1ubuntu1
  ProcVersionSignature: Ubuntu 5.4.0-31.35-generic 5.4.34
  Uname: Linux 5.4.0-31-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Fri May 22 22:41:17 2020
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2016-06-24 (1428 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  SourcePackage: openjdk-8
  UpgradeStatus: Upgraded to focal on 2020-05-20 (2 days ago)

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