Small issues with netbeans6.1 on desktop application on Ubuntu

Netbeans is really great. You can build a project to operate the database directly and use it conveniently.
This is the image.

First, create a project and select Java-desktop application.
Next, select database application in choose application shell.
Next
Finally, select new database connection in master connection.
I am using MySQL, so I need to select MySql,
Enter the url jdbc: mysql: // localhost: 3306/database_name
And user name, password
Finish and run.
Very nice, but on Ubuntu, I didn't use the default skin of the system, so this bug occurs.
Run:
14:44:51 org. jdesktop. application. Application create
Warning couldn't set lookandfeel application. lookandfeel = "system"
Java. Lang. nullpointerexception
At javax. Swing. plaf. synth. synthlookandfeel $ aatextlistener. propertychange (synthlookandfeel. Java: 793)
At java. Beans. propertychangesupport. firepropertychange (propertychangesupport. Java: 339)
At java. Beans. propertychangesupport. firepropertychange (propertychangesupport. Java: 347)
At java. Beans. propertychangesupport. firepropertychange (propertychangesupport. Java: 276)
At java. AWT. toolkit. setjavastopproperty (Toolkit. Java: 1784)
At sun. AWT. suntoolkit. firehose topfontpropertychanges (suntoolkit. Java: 1698)
At sun. AWT. suntoolkit. setaafontsettingscondition (suntoolkit. Java: 1743)
At sun. Swing. swingutilities2 $ aatextinfo. getaatextinfo (swingutilities2.java: 119)
At com. Sun. java. Swing. plaf. GTK. gtklookandfeel. initcomponentdefaults (gtklookandfeel. Java: 1258)
At com. Sun. java. Swing. plaf. GTK. gtklookandfeel. getdefaults (gtklookandfeel. Java: 294)
At javax. Swing. uimanager. setlookandfeel (uimanager. Java: 537)
At javax. Swing. uimanager. setlookandfeel (uimanager. Java: 581)
At org. jdesktop. application. application. Create (application. Java: 249)
At org. jdesktop. application. Application $ 1.run( application. Java: 169)
At java. AWT. event. invocationevent. Dispatch (invocationevent. Java: 209)
At java. AWT. eventqueue. dispatchevent (eventqueue. Java: 597)
At java. AWT. eventdispatchthread. pumponeeventforfilters (eventdispatchthread. Java: 273)
At java. AWT. eventdispatchthread. pumpeventsforfilter (eventdispatchthread. Java: 183)
At java. AWT. eventdispatchthread. pumpeventsforhierarchy (eventdispatchthread. Java: 173)
At java. AWT. eventdispatchthread. pumpevents (eventdispatchthread. Java: 168)
At java. AWT. eventdispatchthread. pumpevents (eventdispatchthread. Java: 160)
At java. AWT. eventdispatchthread. Run (eventdispatchthread. Java: 121)
14:44:51 org. jdesktop. application. Application $1 run
Severe: Application class dbinout. dbinoutapp failed to launch
Java. Lang. nullpointerexception
......

Therefore, you need to select Java default in look & feel of the desktop app in the property, so that it is OK...
Hey, get the basic usage of an interface database in 2 minutes...