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[Rodrigo Rodrigues da Silva <rsilva@xxxxxxxxxxxxxxxxxx>]

I can reproduce this in openjdk-7, built from latest icedtea (2.4.4) and
latest icedtea web plugin. It looks like a JDK bug.

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https://bugs.launchpad.net/bugs/1215487

Title:
  IcedTea6 1.12.6 browser plugin crashes when loading pages with Java
  applets

Status in “openjdk-6” package in Ubuntu:
  Confirmed

Bug description:
  Here's what's shown when calling the browser from a shell:

  		java version "1.6.0_27"
  		OpenJDK Runtime Environment (IcedTea6 1.12.6) (6b27-1.12.6-1ubuntu0.10.04.2)
  		OpenJDK Server VM (build 20.0-b12, mixed mode)
  		java.lang.NullPointerException
  			at javax.swing.SwingUtilities.appContextGet(SwingUtilities.java:1858)
  			at javax.swing.SwingUtilities.getSharedOwnerFrame(SwingUtilities.java:1828)
  			at javax.swing.JWindow.<init>(JWindow.java:185)
  			at javax.swing.JWindow.<init>(JWindow.java:137)
  			at net.sourceforge.jnlp.runtime.JNLPSecurityManager.<init>(JNLPSecurityManager.java:121)
  			at net.sourceforge.jnlp.runtime.JNLPRuntime.initialize(JNLPRuntime.java:238)
  			at sun.applet.PluginAppletSecurityContext.<init>(PluginAppletSecurityContext.java:245)
  			at sun.applet.PluginMain.main(PluginMain.java:109)
  		Something very bad happened. I don't know what to do, so I am going to exit :(

  I detected the issue while running Seamonkey 2.20 on web pages
  containing embedded Java applets (here's a handy one to test:
  http://www.bitstorm.org/gameoflife/), but I know it also happens with
  previous versions of Seamonkey, and I suspect it also happens with
  other browsers.

  The workaround is to downgrade the IcedTea6 packages to the
  immediately preceding version:

  		cd /tmp
  		wget https://launchpad.net/~ubuntu-security/+archive/ppa/+build/4519908/+files/openjdk-6-jre-headless_6b27-1.12.5-0ubuntu0.10.04.1_i386.deb \
  			https://launchpad.net/~ubuntu-security/+archive/ppa/+build/4519908/+files/icedtea-6-jre-cacao_6b27-1.12.5-0ubuntu0.10.04.1_i386.deb \
  			https://launchpad.net/~ubuntu-security/+archive/ppa/+build/4519908/+files/openjdk-6-jre_6b27-1.12.5-0ubuntu0.10.04.1_i386.deb
  		sudo dpkg -i openjdk-6-jre-headless_6b27-1.12.5-0ubuntu0.10.04.1_i386.deb \
  			icedtea-6-jre-cacao_6b27-1.12.5-0ubuntu0.10.04.1_i386.deb \
  			openjdk-6-jre_6b27-1.12.5-0ubuntu0.10.04.1_i386.deb

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