Kojo hangs on loading screen in Ubuntu 15.04 http://kogics.wikidot.com/forum/t-1277900/kojo-hangs-on-loading-screen-in-ubuntu-15-04 Posts in the discussion thread "Kojo hangs on loading screen in Ubuntu 15.04" - When I try to run Kojo from the command line on Ubuntu 15.04, it hangs forever on the loading splash screen Mon, 10 Aug 2026 11:13:44 +0000 http://kogics.wikidot.com/forum/t-1277900#post-2336369 (no title) http://kogics.wikidot.com/forum/t-1277900/kojo-hangs-on-loading-screen-in-ubuntu-15-04#post-2336369 Sun, 12 Jul 2015 03:09:19 +0000 lalitp 66813 Good to know.

A similar looking problem was reported here: https://groups.google.com/forum/#!topic/kojo-dev/u1jbahCiu-0

I will update that thread.

Thanks,
- Lalit

]]> http://kogics.wikidot.com/forum/t-1277900#post-2336368 (no title) http://kogics.wikidot.com/forum/t-1277900/kojo-hangs-on-loading-screen-in-ubuntu-15-04#post-2336368 Sun, 12 Jul 2015 03:05:08 +0000 Richard Eggert I solved the mystery on my own.

The hang was caused by Java Ayatana (evidenced by the "Picked up JAVA_TOOLS_OPTIONS" line above).

Adding this to the Kojo launch script corrected the problem:

unset JAVA_TOOL_OPTIONS

]]> http://kogics.wikidot.com/forum/t-1277900#post-2336363 Kojo hangs on loading screen in Ubuntu 15.04 http://kogics.wikidot.com/forum/t-1277900/kojo-hangs-on-loading-screen-in-ubuntu-15-04#post-2336363 Sun, 12 Jul 2015 02:44:18 +0000 Richard Eggert When I try to run Kojo from the command line on Ubuntu 15.04, it hangs forever on the loading splash screen. I've tried it with Java 8 and Java 7, and with OpenJDK and the Oracle JRE.

On the console, I see this:

./kojo
Picked up JAVA_TOOL_OPTIONS: -javaagent:/usr/share/java/jayatanaag.jar
[INFO] Running first Kojo instance with args: []
[INFO] Java Home: /opt/jre1.8.0_45
Picked up JAVA_TOOL_OPTIONS: -javaagent:/usr/share/java/jayatanaag.jar
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option PermSize=32m; support was removed in 8.0
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=256m; support was removed in 8.0
[INFO] Logging has been redirected to: /home/daddy/.kojo/lite/log/kojo0.log

Exception: java.lang.NullPointerException thrown from the UncaughtExceptionHandler in thread "AWT-EventQueue-0"

The above is for the Oracle JRE for Java 8, but there are only slight variations with other versions. The NPE at the bottom appears in all cases, and I suspect that it's at the root of the problem.

In the log, I see only a listing of the system properties, followed by this, which mirrors what I saw in the console:

[Sat Jul 11 22:33:53 EDT 2015, CodeExecutionSupport] SEVERE: stderr> Exception in thread "AWT-EventQueue-0"
[Sat Jul 11 22:33:53 EDT 2015, CodeExecutionSupport] SEVERE: stderr> Exception in thread "AWT-EventQueue-0"

Since there is no stack trace attached to the exception, I can't even venture a guess as to what the problem could be.

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