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[Bug 432677] Re: Java JComboBox callback freezes Xorg

 

I could reproduce the issue with

IntelliJ IDEA 2018.3.3 (Community Edition)
Build #IC-183.5153.38, built on January 9, 2019
JRE: 1.8.0_152-release-1343-b26 amd64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Linux 4.18.0-13-generic

when running a minimal Maven project around XLock.java with OpenJDK 11
on Ubuntu 18.10(!).

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https://bugs.launchpad.net/bugs/432677

Title:
  Java JComboBox callback freezes Xorg

Status in Sun Java:
  New
Status in openjdk-6 package in Ubuntu:
  Triaged

Bug description:
  My machine is a desktop with an Intel Core 2 Quad, 2Gb and a video board Intel(R) 965G.
  I am using Ubuntu 9.04 32 bits, Eclipse 3.5 (Galileo), Sun Java 1.6.0_16 provided by sun-java6-* packages.

  Steps to reproduce (please read it until the end before trying):
   * Create a Java project in Eclipse.
   * Add the attached XLock Java class in this project
   * Put a breakpoint in the method actionPerformed()
   * Run this class (note that it has a method main()) in debug mode
   * A tiny window will appear
   * Select another animal in the combo box
   * Eclipse should stop in the breakpoint
   * All your Xorg is locked now. You can move your mouse, but nothing responds any more
   * To unlock it press CONTROL+ALT+F1, login to the terminal and kill the latest Java process
   * Everything gets back to normal

  I don't know exactly where the problem is, but Xorg should never lock
  because of a problem in an application.

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