How many teams used default Java code?

[TubaMorg]

Can you provide more details? So here are the steps to test it:
The following assumes that you have completed all updates, installed the FRC plugins for NetBeans, and have your cables/robot network set up correctly.

In NetBeans, go to File->New Project
Scroll down to Samples and open the FRC Java folder.
Look for DefaultCodeProject.zip and double click it.
Give the project a name of some sort.
The new project SHOULD be your main project (the main project is in BOLD in the Projects pane). If not, right click your newly created project and click on "Set as Main Project".

Ok now you have a Java project.

To Deploy:
Either hit the Green arrow at the top of the GUI or hit F6. This builds and deploys the Main project to the robot.

At some point you should see something like this:
Connecting FTP @10.20.57.2

Indicating that it is trying to connect to your robot. Once it is connected it will erase and upload the newly build Jar file.

Try this and report what happens.