FULL PRODUCT VERSION :
openjdk version "1.8.0_66-internal"
OpenJDK Runtime Environment (build 1.8.0_66-internal-b17)
OpenJDK 64-Bit Server VM (build 25.66-b17, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Ubuntu 15.04

A DESCRIPTION OF THE PROBLEM :
The problem occurs when installing Netbeans.

REGRESSION. Last worked in version 7u80

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
I tried to install Netbeans 8.0.2 and got the following error from the netbeans log file
[2015-11-04 16:29:45.541]: message: An unexpected exception happened in thread main
[2015-11-04 16:29:45.541]:
[2015-11-04 16:29:45.541]: Exception:
[2015-11-04 16:29:45.541]: java.awt.AWTError:
[2015-11-04 16:29:45.541]: Assistive Technology not found: org.GNOME.Accessibility.AtkWrapper

I launched the installation on Netbeans 7.4 too but got the same error
I then installed openjdk-7-jdk and set it as the default jdk. I then retried the Netbeans 8.0.4 installation and this time there was no error.


ERROR MESSAGES/STACK TRACES THAT OCCUR :
[2015-11-04 16:29:43.023]: entering -- org.netbeans.installer.Installer.main():81
[2015-11-04 16:29:43.028]: initializing the installer engine
[2015-11-04 16:29:43.028]: entering -- org.netbeans.installer.Installer.<init>():116
[2015-11-04 16:29:43.028]: ... initializing ErrorHandler
[2015-11-04 16:29:43.031]: ... end of ErrorHandler initialization
[2015-11-04 16:29:43.031]: exiting -- org.netbeans.installer.Installer.<init>():116
[2015-11-04 16:29:43.031]: entering -- org.netbeans.installer.Installer.<init>():117
[2015-11-04 16:29:43.031]: dumping target system information
[2015-11-04 16:29:43.031]: system properties:
[2015-11-04 16:29:43.036]: awt.toolkit => sun.awt.X11.XToolkit
[2015-11-04 16:29:43.036]: file.encoding => UTF-8
[2015-11-04 16:29:43.036]: file.encoding.pkg => sun.io
[2015-11-04 16:29:43.037]: file.separator => /
[2015-11-04 16:29:43.037]: java.awt.graphicsenv => sun.awt.X11GraphicsEnvironment
[2015-11-04 16:29:43.037]: java.awt.printerjob => sun.print.PSPrinterJob
[2015-11-04 16:29:43.037]: java.class.path => /tmp/.nbi-3112936.tmp/bundle.jar
[2015-11-04 16:29:43.037]: java.class.version => 52.0
[2015-11-04 16:29:43.037]: java.endorsed.dirs => /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/endorsed
[2015-11-04 16:29:43.038]: java.ext.dirs => /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext:/usr/java/packages/lib/ext
[2015-11-04 16:29:43.038]: java.home => /usr/lib/jvm/java-8-openjdk-amd64/jre
[2015-11-04 16:29:43.038]: java.io.tmpdir => /tmp
[2015-11-04 16:29:43.038]: java.library.path => /usr/java/packages/lib/amd64:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni:/lib:/usr/lib
[2015-11-04 16:29:43.038]: java.runtime.name => OpenJDK Runtime Environment
[2015-11-04 16:29:43.038]: java.runtime.version => 1.8.0_66-internal-b17
[2015-11-04 16:29:43.039]: java.specification.name => Java Platform API Specification
[2015-11-04 16:29:43.039]: java.specification.vendor => Oracle Corporation
[2015-11-04 16:29:43.039]: java.specification.version => 1.8
[2015-11-04 16:29:43.039]: java.vendor => Oracle Corporation
[2015-11-04 16:29:43.039]: java.vendor.url => http://java.oracle.com/
[2015-11-04 16:29:43.039]: java.vendor.url.bug => http://bugreport.sun.com/bugreport/
[2015-11-04 16:29:43.039]: java.version => 1.8.0_66-internal
[2015-11-04 16:29:43.040]: java.vm.info => mixed mode
[2015-11-04 16:29:43.040]: java.vm.name => OpenJDK 64-Bit Server VM
[2015-11-04 16:29:43.040]: java.vm.specification.name => Java Virtual Machine Specification
[2015-11-04 16:29:43.040]: java.vm.specification.vendor => Oracle Corporation
[2015-11-04 16:29:43.040]: java.vm.specification.version => 1.8
[2015-11-04 16:29:43.041]: java.vm.vendor => Oracle Corporation
[2015-11-04 16:29:43.041]: java.vm.version => 25.66-b17
[2015-11-04 16:29:43.041]: line.separator =>
[2015-11-04 16:29:43.041]: netbeans.default_cachedir_root => /home/harvey/.cache/netbeans
[2015-11-04 16:29:43.041]: netbeans.default_userdir_root => /home/harvey/.netbeans
[2015-11-04 16:29:43.041]: os.arch => amd64
[2015-11-04 16:29:43.042]: os.name => Linux
[2015-11-04 16:29:43.042]: os.version => 4.2.0-16-generic
[2015-11-04 16:29:43.042]: path.separator => :
[2015-11-04 16:29:43.042]: sun.arch.data.model => 64
[2015-11-04 16:29:43.042]: sun.boot.class.path => /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/resources.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/rt.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/sunrsasign.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/jsse.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/jce.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/charsets.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/jfr.jar:/usr/lib/jvm/java-8-openjdk-amd64/jre/classes
[2015-11-04 16:29:43.042]: sun.boot.library.path => /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64
[2015-11-04 16:29:43.043]: sun.cpu.endian => little
[2015-11-04 16:29:43.043]: sun.cpu.isalist =>
[2015-11-04 16:29:43.043]: sun.desktop => gnome
[2015-11-04 16:29:43.043]: sun.io.unicode.encoding => UnicodeLittle
[2015-11-04 16:29:43.043]: sun.java.command => org.netbeans.installer.Installer
[2015-11-04 16:29:43.043]: sun.java.launcher => SUN_STANDARD
[2015-11-04 16:29:43.043]: sun.jnu.encoding => UTF-8
[2015-11-04 16:29:43.044]: sun.management.compiler => HotSpot 64-Bit Tiered Compilers
[2015-11-04 16:29:43.044]: sun.os.patch.level => unknown
[2015-11-04 16:29:43.044]: user.country => US
[2015-11-04 16:29:43.044]: user.dir => /home/harvey/Documents
[2015-11-04 16:29:43.044]: user.home => /home/harvey
[2015-11-04 16:29:43.044]: user.language => en
[2015-11-04 16:29:43.044]: user.name => harvey
[2015-11-04 16:29:43.044]: user.timezone => Africa/Douala
[2015-11-04 16:29:43.045]: ... end of target system information
[2015-11-04 16:29:43.045]: exiting -- org.netbeans.installer.Installer.<init>():117
[2015-11-04 16:29:43.117]: loading jni library
[2015-11-04 16:29:43.117]: library resource path: native/jnilib/linux/linux-amd64.so
[2015-11-04 16:29:43.218]: library file path: /tmp/nbi-5391366198000665107.tmp
[2015-11-04 16:29:43.225]: ... successfully loaded the library
[2015-11-04 16:29:43.229]: entering -- org.netbeans.installer.Installer.<init>():122
[2015-11-04 16:29:43.229]: parsing command-line arguments
[2015-11-04 16:29:43.239]: ... no command line arguments were specified
[2015-11-04 16:29:43.239]: ... finished parsing command line arguments
[2015-11-04 16:29:43.240]: exiting -- org.netbeans.installer.Installer.<init>():122
[2015-11-04 16:29:43.240]: entering -- org.netbeans.installer.Installer.<init>():123
[2015-11-04 16:29:43.240]: loading engine properties
[2015-11-04 16:29:43.240]: loading engine properties
[2015-11-04 16:29:43.244]: loading nbi.wizard.ui.swing.frame.width.default => 600
[2015-11-04 16:29:43.244]: loading nbi.wizard.ui.swing.frame.width.gtk => 704
[2015-11-04 16:29:43.244]: loading nbi.wizard.ui.swing.frame.head.right.image => resource:org/netbeans/installer/wizard/wizard-description-background.png
[2015-11-04 16:29:43.244]: loading nbi.wizard.ui.swing.frame.minimum.width.nimbus => 624
[2015-11-04 16:29:43.244]: loading nbi.wizard.ui.swing.frame.minimum.height.win.xp => 450
[2015-11-04 16:29:43.245]: loading nbi.wizard.ui.swing.frame.minimum.height.nimbus => 512
[2015-11-04 16:29:43.245]: loading nbi.wizard.ui.swing.frame.title.prefix => NetBeans IDE Installer
[2015-11-04 16:29:43.245]: loading nbi.wizard.ui.swing.frame.width.nimbus => 624
[2015-11-04 16:29:43.245]: loading nbi.wizard.ui.swing.frame.width.win.xp => 600
[2015-11-04 16:29:43.245]: loading nbi.overall.license.jdk5.resource => org/netbeans/installer/product/components/netbeans-license-jdk5.txt
[2015-11-04 16:29:43.246]: loading nbi.wizard.ui.swing.frame.minimum.height.win.classic => 442
[2015-11-04 16:29:43.246]: loading nbi.overall.license.jtb.resource => org/netbeans/installer/product/components/netbeans-license-jtb.txt
[2015-11-04 16:29:43.246]: loading nbi.wizard.ui.swing.frame.minimum.width.default => 600
[2015-11-04 16:29:43.246]: loading nbi.wizard.ui.swing.frame.height.motif => 470
[2015-11-04 16:29:43.246]: loading nbi.wizard.ui.swing.frame.height.aqua => 480
[2015-11-04 16:29:43.246]: loading nbi.wizard.ui.swing.frame.minimum.width.win.xp => 600
[2015-11-04 16:29:43.246]: loading nbi.wizard.ui.swing.frame.minimum.height.aqua => 480
[2015-11-04 16:29:43.246]: loading nbi.overall.license.jdk6.resource => org/netbeans/installer/product/components/netbeans-license-jdk6.txt
[2015-11-04 16:29:43.247]: loading nbi.wizard.ui.swing.frame.minimum.height.default => 500
[2015-11-04 16:29:43.247]: loading nbi.product.suggest.install => true
[2015-11-04 16:29:43.247]: loading nbi.overall.license.mysql.resource => org/netbeans/installer/product/components/netbeans-license-mysql.txt
[2015-11-04 16:29:43.247]: loading nbi.wizard.ui.swing.frame.icon => resource:org/netbeans/installer/wizard/wizard-icon.png
[2015-11-04 16:29:43.247]: loading nbi.wizard.ui.swing.frame.minimum.height.gtk => 528
[2015-11-04 16:29:43.247]: loading nbi.wizard.ui.swing.frame.width.aqua => 640
[2015-11-04 16:29:43.247]: loading nbi.wizard.ui.swing.frame.minimum.height.motif => 470
[2015-11-04 16:29:43.247]: loading nbi.wizard.ui.swing.frame.width.motif => 624
[2015-11-04 16:29:43.248]: loading nbi.product.remove.corrupted.products.silently => true
[2015-11-04 16:29:43.248]: loading nbi.wizard.ui.swing.frame.minimum.width.win.classic => 588
[2015-11-04 16:29:43.248]: loading nbi.wizard.ui.swing.welcome.left.bottom.image => resource:org/netbeans/installer/wizard/components/panels/netbeans/resources/welcome-left-bottom.png
[2015-11-04 16:29:43.248]: loading nbi.overall.license.resource => org/netbeans/installer/product/components/netbeans-license.txt
[2015-11-04 16:29:43.248]: loading nbi.macosx.application.directory.name => NetBeans IDE Installer
[2015-11-04 16:29:43.248]: loading nbi.wizard.ui.swing.frame.height.gtk => 528
[2015-11-04 16:29:43.248]: loading nbi.wizard.ui.swing.frame.minimum.width.metal => 624
[2015-11-04 16:29:43.249]: loading nbi.wizard.ui.swing.frame.minimum.width.motif => 624
[2015-11-04 16:29:43.249]: loading nbi.wizard.ui.swing.frame.height.metal => 470
[2015-11-04 16:29:43.249]: loading nbi.wizard.ui.swing.frame.minimum.width.gtk => 704
[2015-11-04 16:29:43.249]: loading nbi.junit.license.resource => org/netbeans/installer/product/components/junit-license.txt
[2015-11-04 16:29:43.250]: loading nbi.wizard.ui.swing.frame.width.metal => 624
[2015-11-04 16:29:43.250]: loading nbi.wizard.ui.swing.frame.height.win.classic => 442
[2015-11-04 16:29:43.250]: loading nbi.wizard.ui.swing.frame.height.win.xp => 450
[2015-11-04 16:29:43.250]: loading nbi.wizard.ui.swing.frame.height.default => 500
[2015-11-04 16:29:43.250]: loading nbi.wizard.ui.swing.frame.height.nimbus => 512
[2015-11-04 16:29:43.250]: loading nbi.overall.license.javafx.resource => org/netbeans/installer/product/components/netbeans-license-javafx.txt
[2015-11-04 16:29:43.250]: loading nbi.wizard.ui.swing.frame.title.pattern => {0}
[2015-11-04 16:29:43.250]: loading nbi.wizard.ui.swing.frame.width.win.classic => 588
[2015-11-04 16:29:43.251]: loading nbi.wizard.ui.swing.frame.minimum.width.aqua => 640
[2015-11-04 16:29:43.251]: loading nbi.wizard.ui.swing.frame.minimum.height.metal => 470
[2015-11-04 16:29:43.251]: ... finished loading engine properties
[2015-11-04 16:29:43.251]: exiting -- org.netbeans.installer.Installer.<init>():123
[2015-11-04 16:29:43.251]: initializing the local directory
[2015-11-04 16:29:43.252]: ... custom local directory was not specified, using the default
[2015-11-04 16:29:43.253]: ... local directory: /home/harvey/.nbi
[2015-11-04 16:29:43.253]: ... finished initializing local directory
[2015-11-04 16:29:43.287]: entering -- org.netbeans.installer.Installer.<init>():129
[2015-11-04 16:29:43.288]: ... initializing DownloadManager
[2015-11-04 16:29:43.298]: file not exist, queue is empty!
[2015-11-04 16:29:43.322]: ... end of initializing DownloadManager
[2015-11-04 16:29:43.323]: exiting -- org.netbeans.installer.Installer.<init>():129
[2015-11-04 16:29:43.323]: entering -- org.netbeans.installer.Installer.<init>():130
[2015-11-04 16:29:43.323]: ... initializing Registry
[2015-11-04 16:29:43.344]: ... end of initializing ErrorHandler
[2015-11-04 16:29:43.344]: exiting -- org.netbeans.installer.Installer.<init>():130
[2015-11-04 16:29:43.344]: entering -- org.netbeans.installer.Installer.<init>():131
[2015-11-04 16:29:43.345]: ... initializing Wizard
[2015-11-04 16:29:44.638]: ... loading registry from resource:data/registry.xml
[2015-11-04 16:29:44.969]: entering -- org.netbeans.installer.product.Registry.loadProductRegistry():991
[2015-11-04 16:29:44.969]: validating previous installations
[2015-11-04 16:29:44.971]: ... validating installations finished
[2015-11-04 16:29:44.971]: exiting -- org.netbeans.installer.product.Registry.loadProductRegistry():991
[2015-11-04 16:29:44.998]: Can`t load message in bundle org.netbeans.installer.wizard.components.panels.netbeans.Bundle for key NPrISP.installation.folders using [sun.misc.Launcher$AppClassLoader@28d93b30] classloader
[2015-11-04 16:29:45.028]: ... end of initializing Wizard
[2015-11-04 16:29:45.029]: exiting -- org.netbeans.installer.Installer.<init>():131
[2015-11-04 16:29:45.029]: creating lock file
[2015-11-04 16:29:45.029]: ... lock file already exists at /home/harvey/.nbi/.nbilock
[2015-11-04 16:29:45.029]: ... to skip lock file check run installer with --ignore-lock argument
[2015-11-04 16:29:45.116]: ... initializing look and feel
[2015-11-04 16:29:45.118]: ... custom look and feel class name was not specified, using system default
[2015-11-04 16:29:45.532]: ... initializing L&F finished
[2015-11-04 16:29:45.533]: An unexpected exception happened in thread main
[2015-11-04 16:29:45.535]: java.awt.AWTError: Assistive Technology not found: org.GNOME.Accessibility.AtkWrapper
[2015-11-04 16:29:45.535]: at java.awt.Toolkit.loadAssistiveTechnologies(Toolkit.java:807)
[2015-11-04 16:29:45.535]: at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:886)
[2015-11-04 16:29:45.536]: at javax.swing.UIManager.getSystemLookAndFeelClassName(UIManager.java:611)
[2015-11-04 16:29:45.536]: at org.netbeans.installer.utils.UiUtils.getDefaultLookAndFeelClassName(UiUtils.java:468)
[2015-11-04 16:29:45.536]: at org.netbeans.installer.utils.UiUtils.initializeLookAndFeel(UiUtils.java:261)
[2015-11-04 16:29:45.536]: at org.netbeans.installer.utils.UiUtils.initLAF(UiUtils.java:550)
[2015-11-04 16:29:45.536]: at org.netbeans.installer.utils.UiUtils.showYesNoDialog(UiUtils.java:163)
[2015-11-04 16:29:45.537]: at org.netbeans.installer.utils.UiUtils.showYesNoDialog(UiUtils.java:151)
[2015-11-04 16:29:45.537]: at org.netbeans.installer.Installer.createLockFile(Installer.java:436)
[2015-11-04 16:29:45.537]: at org.netbeans.installer.Installer.<init>(Installer.java:132)
[2015-11-04 16:29:45.538]: at org.netbeans.installer.Installer.main(Installer.java:81)
[2015-11-04 16:29:45.540]: ... show message dialog
[2015-11-04 16:29:45.540]: title: Critical Error
[2015-11-04 16:29:45.541]: message: An unexpected exception happened in thread main
[2015-11-04 16:29:45.541]:
[2015-11-04 16:29:45.541]: Exception:
[2015-11-04 16:29:45.541]: java.awt.AWTError:
[2015-11-04 16:29:45.541]: Assistive Technology not found: org.GNOME.Accessibility.AtkWrapper
[2015-11-04 16:29:45.541]:
[2015-11-04 16:29:45.542]: You can get more details about the issue in the installer log file:
[2015-11-04 16:29:45.542]: /home/harvey/.nbi/log/20151104162943.log
[2015-11-04 19:18:00.110]: executing command: chmod ugo+x nbi-cleaner7640748591584530958.sh, in directory: /tmp
[2015-11-04 19:18:00.136]: [return]: 0
[2015-11-04 19:18:00.137]: ... command execution finished
[2015-11-04 19:18:00.140]: ... cleaning process has been started

REPRODUCIBILITY :
This bug can be reproduced always.