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Steps to reproduce: 1. Create a new Java project. 2. Right-click on the project node, Properties > Application > Web Start 3. Tick "Enable Web Start" 4. Click ok 5. Open Properties > Application > Web Start again 6. Web Start is no longer ticked, and under "Run", it asks you to enable Web Start to launch with web start. 7. Selecting the "Web Start" run configuration (which does get created) and trying to run the project causes an error stating: /home/joshua/workspace/java/EverCoreUtils/nbproject/jnlp-impl.xml:589: Project cannot be run with selected Run Configuration when Java Web Start is disabled. BUILD FAILED (total time: 1 second) I was able to reproduce this on both Ubuntu 12.10 and Fedora 18, but it works fine on Windows 7 x64. I was able to reproduce it with both a clean netbeans install (on a freshly installed Fedora 18, actually), as well as an installation of netbeans that I'd been using for some time. I'm using OpenJDK and it's up-to-date. Incidentally, editing nbproject/project.properties and setting "jnlp-enabled" to "true" will make the Enable Web Start button ticked, but only once (closing and opening it again causes it to no longer be checked again). On a side note, Google is startlingly unhelpful with this problem, which seems to suggest it's not common...
I don't know if this will help at all, but setting jnlp-enabled to true in project.properties and then running the project with the "Web Start" profile selected results in this message: /home/joshua/workspace/java/EverCoreUtils/nbproject/jnlp-impl.xml:245: Error: WebStart executable could not be found. BUILD FAILED (total time: 9 seconds)
*** This bug has been marked as a duplicate of bug 221229 ***
This is common enough actually. The combination of NetBeans and Ubuntu seems to cause this. I've reproduced on NetBeans 7.4 + OpenJDK7 x86_64, NetBeans 8.0 + OpenJDK7 x86_64. This completely breaks WebStart functionality on Ubuntu. Any work-arounds would be appreciated as this forces some of my projects to be built on another OS (Windows) until this is resolved.