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POJava - NullPointerException at start. Swing bug or faulty implementation?
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copied!<p>I am developing an application for a company, which manages an oracle database in various ways. The program is in Java, NetBeans and it is getting pretty big. I wouldn't say it's very well written, but I often get back to older bad code and try to make it as readable and oop as I can.</p> <p>I've noticed that 1 out of 10 times, when I start the program, I am getting the following Exception: (though the program starts and works right, even these times)</p> <pre><code>Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at javax.swing.plaf.synth.SynthLabelUI.getMinimumSize(SynthLabelUI.java:199) at javax.swing.JComponent.getMinimumSize(JComponent.java:1702) at javax.swing.GroupLayout$ComponentSpring.calculateNonlinkedMinimumSize(GroupLayout.java:2933) at javax.swing.GroupLayout$ComponentSpring.calculateMinimumSize(GroupLayout.java:2897) at javax.swing.GroupLayout$Spring.getMinimumSize(GroupLayout.java:1315) at javax.swing.GroupLayout$ComponentSpring.calculatePreferredSize(GroupLayout.java:2904) at javax.swing.GroupLayout$Spring.getPreferredSize(GroupLayout.java:1325) at javax.swing.GroupLayout$Group.getSpringSize(GroupLayout.java:1604) at javax.swing.GroupLayout$Group.calculateSize(GroupLayout.java:1593) at javax.swing.GroupLayout$Group.calculatePreferredSize(GroupLayout.java:1568) at javax.swing.GroupLayout$Spring.getPreferredSize(GroupLayout.java:1325) at javax.swing.GroupLayout$Group.getSpringSize(GroupLayout.java:1604) at javax.swing.GroupLayout$Group.calculateSize(GroupLayout.java:1590) at javax.swing.GroupLayout$Group.calculatePreferredSize(GroupLayout.java:1568) at javax.swing.GroupLayout$Spring.getPreferredSize(GroupLayout.java:1325) at javax.swing.GroupLayout$Group.getSpringSize(GroupLayout.java:1604) at javax.swing.GroupLayout$Group.calculateSize(GroupLayout.java:1593) at javax.swing.GroupLayout$Group.calculatePreferredSize(GroupLayout.java:1568) at javax.swing.GroupLayout$Spring.getPreferredSize(GroupLayout.java:1325) at javax.swing.GroupLayout$Group.getSpringSize(GroupLayout.java:1604) at javax.swing.GroupLayout$Group.calculateSize(GroupLayout.java:1590) at javax.swing.GroupLayout$Group.calculatePreferredSize(GroupLayout.java:1568) at javax.swing.GroupLayout$Spring.getPreferredSize(GroupLayout.java:1325) at javax.swing.GroupLayout$Group.getSpringSize(GroupLayout.java:1604) at javax.swing.GroupLayout$Group.calculateSize(GroupLayout.java:1590) at javax.swing.GroupLayout$Group.calculatePreferredSize(GroupLayout.java:1568) at javax.swing.GroupLayout$Spring.getPreferredSize(GroupLayout.java:1325) at javax.swing.GroupLayout$Group.getSpringSize(GroupLayout.java:1604) at javax.swing.GroupLayout$Group.calculateSize(GroupLayout.java:1588) at javax.swing.GroupLayout$Group.calculatePreferredSize(GroupLayout.java:1568) at javax.swing.GroupLayout$Spring.getPreferredSize(GroupLayout.java:1325) at javax.swing.GroupLayout.calculateAutopadding(GroupLayout.java:1050) at javax.swing.GroupLayout.prepare(GroupLayout.java:1037) at javax.swing.GroupLayout.preferredLayoutSize(GroupLayout.java:857) at java.awt.Container.preferredSize(Container.java:1599) at java.awt.Container.getPreferredSize(Container.java:1584) at javax.swing.JComponent.getPreferredSize(JComponent.java:1624) at javax.swing.GroupLayout$ComponentSpring.calculateNonlinkedPreferredSize(GroupLayout.java:2944) at javax.swing.GroupLayout$ComponentSpring.calculateNonlinkedMinimumSize(GroupLayout.java:2930) at javax.swing.GroupLayout$ComponentSpring.calculateMinimumSize(GroupLayout.java:2897) at javax.swing.GroupLayout$Spring.getMinimumSize(GroupLayout.java:1315) at javax.swing.GroupLayout$ComponentSpring.calculatePreferredSize(GroupLayout.java:2904) at javax.swing.GroupLayout$Spring.getPreferredSize(GroupLayout.java:1325) at javax.swing.GroupLayout$Group.getSpringSize(GroupLayout.java:1604) at javax.swing.GroupLayout$Group.calculateSize(GroupLayout.java:1593) at javax.swing.GroupLayout$Group.calculatePreferredSize(GroupLayout.java:1568) at javax.swing.GroupLayout$Spring.getPreferredSize(GroupLayout.java:1325) at javax.swing.GroupLayout$Group.getSpringSize(GroupLayout.java:1604) at javax.swing.GroupLayout$Group.calculateSize(GroupLayout.java:1588) at javax.swing.GroupLayout$Group.calculatePreferredSize(GroupLayout.java:1568) at javax.swing.GroupLayout$Spring.getPreferredSize(GroupLayout.java:1325) at javax.swing.GroupLayout$Group.getSpringSize(GroupLayout.java:1604) at javax.swing.GroupLayout$Group.calculateSize(GroupLayout.java:1588) at javax.swing.GroupLayout$Group.calculatePreferredSize(GroupLayout.java:1568) at javax.swing.GroupLayout$Spring.getPreferredSize(GroupLayout.java:1325) at javax.swing.GroupLayout$SequentialGroup.setValidSize(GroupLayout.java:1972) at javax.swing.GroupLayout$Group.setSize(GroupLayout.java:1553) at javax.swing.GroupLayout.calculateAutopadding(GroupLayout.java:1058) at javax.swing.GroupLayout.layoutContainer(GroupLayout.java:897) at java.awt.Container.layout(Container.java:1421) at java.awt.Container.doLayout(Container.java:1410) at java.awt.Container.validateTree(Container.java:1507) at java.awt.Container.validateTree(Container.java:1513) at java.awt.Container.validateTree(Container.java:1513) at java.awt.Container.validateTree(Container.java:1513) at java.awt.Container.validateTree(Container.java:1513) at java.awt.Container.validateTree(Container.java:1513) at java.awt.Container.validate(Container.java:1480) at java.awt.Window.dispatchEventImpl(Window.java:2473) at java.awt.Component.dispatchEvent(Component.java:4460) at java.awt.EventQueue.dispatchEvent(EventQueue.java:599) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122) </code></pre> <p>I am assuming it is a swing bug. Could it be a problem in my implementation? Why is it happening 1 out of 10 times and not always? Can I do something to avoid it?</p>

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