Stop Java Coffee Cup icon from appearing in the Dock on Mac OSX

java macos hadoop dock
Eugene picture Eugene · Jul 4, 2013 · Viewed 12.8k times · Source

After upgrading to OSX 10.8.4, background Java processes started placing a Java Cup icon in the Dock. It causes the currently active window to loose focus which is very annoying when running some script that forks many short running Java processes (headless). The file menu (top of the screen next to the apple symbol will show the name of the class file that Java is running, e.g. org.apache.hadoop.util.RunJar).

Since I'm not explicitly launching these Java commands, I've tried putting alias java="java -Djava.awt.headless=true" in .profile but this doesn't seem to help.

Has anyone run into this and know how to fix it?

Thank you.

Answer

Nelson Menezes picture Nelson Menezes · Jul 9, 2013

Like @EGHM said, it's -Dapple.awt.UIElement=true, but with no quotes. At least it works for me (OS X 10.7.5).

If you happen to be using Eclipse, you can add this JVM argument globally in Preferences → Installed JREs:

enter image description here

Related questions

/bin/bash: /bin/java: No such file or directory error in Yarn apps in MacOS

I was trying to run a simple wordcount MapReduce Program using Java 1.7 SDK and Hadoop2.7.1 on Mac OS X EL Captain 10.11 and I am getting the following error message in my container log "stderr" /bin/bash: /bin/java: No such …

Read More
How to install Java 8 on Mac

I want to do some programming with the latest JavaFX, which requires Java 8. I'm using IntelliJ 13 CE and Mac OS X 9 Mavericks. I ran Oracle's Java 8 installer, and the files look like they ended up at /Library/Java/JavaVirtualMachines/jdk1.8.0_05.…

Read More
How to set or change the default Java (JDK) version on OS X?

How can you change the default version of Java on a mac?

Read More